The study presents summary, analysis, and hygienic assessment of data on the radiation accidents related to violations of the rules of gathering and recycling of ferrous and non-ferrous metal scrap within the Russian, based on data from the Radiation Accidents and Incidents Database of the Information and Analytical Center of Rospotrebnadzor on Radiation Safety. The aim of the study was to analyze information on radiation accidents associated with violations in the collection and handling of scrap metal occurring in the Russian Federation over period from 2010 to 2023. A total of 971 radiation accidents related to improper handling of scrap metal were recorded across 41 regions in Russia during the study period. The largest number of the accidents occurred in Vologda (206), Sverdlovsk (178), Khabarovsk (150), Saint Petersburg (116), and Orenburg (52) regions. A negative trend in the accident frequency was observed, with an average annual decline rate of 12%, indicating a steady decrease in occurrences over the last 14 years. The primary sources of radioactive contamination in scrap metal included fragments of various radiation-related equipment, pipes, and technological equipment from the oil and gas industry contaminated with natural radionuclides during use (primarily 226Ra and its salts), as well as devices containing permanent luminescent substances based on 226Ra salts. The identified sources were most commonly associated with the radionuclides 226Ra (63%), 137Cs (12%), 60Co (9%), 238U (9%), with occasional cases involving 241Am, 232Th, and 90Sr. In 66% of cases, the ambient gamma dose equivalent rate on the source surface exceeded 1 μSv/h; in 27% it exceeded 10 μSv/h, in 7% it exceeded 100 μSv/h, and in five cases were in range from 1 to 8.8 mSv/h. It was found that sources of ionizing radiation posing potential health risks to the public have been detected throughout the study period. In 14 cases, radioactive contamination was identified in scrap, indicating accidents of melting down radiation sources without investigation into the circumstances or assessment of potential adverse effects. In most (64%) of the registered radiation accidents, the batches of scrap metal were accompanied by radiation control certificates from accredited laboratories, confirming compliance with sanitary standards and regulations. The analysis of radiation accidents related to violations in the collection and handling of scrap metal revealed that the current domestic system for ensuring radiation safety during the procurement and sale of scrap metal remains effective and relevant. Recommendations for improving emergency response during investigations of such radiation accidents have been provided to the Rospotrebnadzor organizations.

The practical implementation of radiation protection principles in the medical exposure of patients often tends to fall into one of two extremes: either excessive simplification of the methodology for assessing radiation health detriment, or its excessive complexity. An example of an excessively simplified approach is the assessment of radiation risk to patients using effective dose and radiation damage coefficients (nominal risk coefficients) as presented in Norms of the Radiation Safety NRB-99/2009. An example of an unjustifiably complex approach can be considered Tables 1-2 in MR 2.6.1.0215-20 "Assessment of radiation risk to patients during X-ray diagnostic radiological examinations," which indicate "lifetime risk values of death taking into account harm from reduced quality of life due to cancer of various organs and tissues and genetic effects from medical examinations" for a wide range of medical diagnostic X-ray radiological examinations in five-year age groups of patients. The main shortcomings of the simplified approach can be considered the lack of differences in risk assessment between individuals of different sexes and ages, although the fact of higher radiosensitivity in children compared to adults and in women compared to men can be considered universally recognized. The risk assessment approach proposed in MR 2.6.1.0215-20 addresses these shortcomings. However, in the view of the authors of this study, it offers an unnecessarily detailed picture considering uncertainties inherent in risk assessments at low doses, as well as uncertainties in the method of interpopulation transfer of radiation risk proposed by the International Commission on Radiological Protection. The aim of this study was to develop and justify a simpler and more straightforward method of presenting information on radiation risks associated with medical X-ray radiological examinations, free from the main drawbacks of the two aforementioned methods. To achieve this goal, radiation risks were calculated using two methods (using effective dose and using the risk model of the International Commission on Radiological Protection). A comparative analysis of the calculation results was conducted with estimates presented in Tables 1-2 of MR 2.6.1.0215-20. As a result of the analysis, an original applied method for presenting qualitative characteristics of radiation risks was developed for use in prescribing X-ray radiological examinations and informing patients about potential health risks. The practical outcome of the study is the formation of a table of radiation risks associated with conducting studies on patients from the Russian population, using the developed method of presenting information on radiation risks.

adiation risks assessment in medical exposure of patients is one of the mandatory steps in justifying the medical radiological examinations. The main objectives of such assessment are the need for benefit-harm analysis, when prescribing a study, and informing patients or their legal representatives about the radiation risk associated with the recommended examination. The traditional approach to radiation risk assessment is the use of measures based on lifetime morbidity and/or mortality due to radiation exposure in risk characterization. However, the development of the methodology of population health assessment and the need to harmonize the methodology of radiation risk assessment with risks from exposure to factors of other nature imply the use of more informative generalized health indicators in the assessment of exposure to harmful environmental factors. The aim of actual work was to apply the developed methodology of radiation detriment assessment to characterize the risk by calculating DALY (number of years of healthy full life lost due to exposure to ionizing radiation) values for different sex and age groups of Russian patients undergoing computed tomography. To achieve this goal, the previously developed method of estimating the number of years of healthy life lost due to exposure to ionizing radiation was used. Calculations were performed with the use of a specially developed computer program based on the models of the International Commission on Radiological Protection using medical and demographic data of Russian population. The article presents the results of DALY calculation for six types of computed tomographic examinations. The use of DALY to characterize risk instead of the most widely used value of radiation detriment (or lifetime risk of death, relating the harm from the reduction in the quality of life in the case of non-fatal oncological disease) is an attempt to harmonize the methodology of radiation risk assessment with the methodologies of other kind of health risks. One of the directions of calculation results usage is the development of sexand age-dependent risk coefficients associated with medical exposure of patients. The analysis of the obtained results showed that the age distribution of risks agrees well with the data presented in the methodological recommendations MR 2.6.1.0215-20 “Assessment of radiation risk to patients in radiology examinations”. It is also shown that the DALY indicator can serve as a basis for comparative assessment of obtainable and avoidable risks in the field of medical radiation exposure of patients.

The paper presents an analysis of the structure and collective dose of diagnostic Xray examinations in the Russian Federation in 2018-2022 to assess the trends in the development of Russian X-ray diagnostics. The study was performed based on the results of the analysis of federal state statistical observation forms (radiationhygienic passports and form №3-DOZ for the 2018-2022 period). The results of the analysis indicated that the considered time interval can be divided into several periods: pre-pandemic (2018-2019), pandemic (2020-2021) and post-pandemic (2022); each of which had its own features of the structure of X-ray diagnostics and, consequently, the collective dose from medical exposure. During 2018-2022 period collective dose from medical exposure has increased by a factor of 1,5: from 85000 manSv to 134000 manSv, mainly due to computed tomography. The contribution of computed tomography to the collective dose has increased from 54 % in 2018 to 74 % in 2022. The results of analysis of the distributions of average effective doses for the most common Xray procedures indicated that, in contrast to the above-mentioned indicators, the average doses did not change significantly over the period considered. The study allowed identifying regions of the Russian Federation systematically presenting incorrect (underestimated) average effective doses from X-ray examinations. Based on the results of analysis, proposals were developed to improve the system of radiation protection of patients from medical exposure. Successful practical implementation of these proposals will allow obtaining reliable data on patient and staff doses in the Russian Federation and avoiding excessive increase in doses from medical exposure.

This paper describes the preconditions of creation and the process of development of the Automated System for Radiation Risk Analysis. Three main objectives for the development of an automated system for radiation risk analysis were identified: creation of a tool for the development and scientific justification of hygienic standards and other protective quantities in the field of ionizing radiation application; practical implementation of the principles of justification and optimization in radiation protection on the basis of monetary assessment of radiation health risks; and comparative analysis of risks of different nature on the basis of comparable indicators of population health. The Russian software platform 1C: Enterprise was chosen as the development platform for the Automatized System for Radiation Risk Analysis. The choice of this platform was related to simplification of integration with other computer systems being developed at the Research Institute of Radiation Hygiene after Prof. P.V. Ramzaev, such as the Automated System for Radiation Exposure Control of Rospotrebnadzor. Before the practical development of the system in accordance with the terms of reference, the main parameters in view of its interaction with the user were determined: arrangement of the user interface elements, main input parameters, primary calculated indicators and output calculation results, etc. The estimation of annual increase in the probability of radiation-induced malignant neoplasms depending on the organ dose, sex and age of the exposed person and other parameters according to the models of the UN Scientific Committee on the Effects of Atomic Radiation, the U.S. Environmental Protection Agency and Publications 103 and 152 of the International Commission on Radiological Protection was implemented in the system. The capabilities of the system include calculation of a number of modern lifetime radiation risk indicators used for risk characterization in various scientific publications over the last 35 years, including calculation of population risks based on national medical and demographic data of several dozen states published over the last 50 years.

The article presents analysis of exposure doses to the population of observation zones and personnel of radiation facilities of the Russian Federation in 2021. For the analysis , we used data received by the Federal Data Bank on Personnel Exposure Doses , which operates as part of the Unified System of Individual Dose Control of the Russian Federation citizens . Data received from 20 359 radiation facilities were used . Among them , there are 19 743 radiation hazardous facilities supervised by Rospotrebnadzor and 616 supervised by the FMBA of Russia. 15 883 (78%) radiation hazardous facilities are medical institutions . In total , in 2021, the Federal Data Bank on Personnel Exposure Doses received the results of measuring the annual individual effective doses of technogenic industrial exposure of 239 743 persons of group A personnel and 22 490 persons of group B personnel . 12 095 people of group A personnel who worked part-time at several radiation facilities were identified The average annual effective dose of technogenic occupational exposure of group A personnel in 2021 was 1.12 mSv , and for group B personnel , whose exposure doses were obtained according to instrumental control data – 0.61 mSv . The maximum values of the average annual effective dose of technogenic occupational exposure for group A personnel in 2021 took place in the Zabaykalsky Krai (2.81 mSv ), Perm Krai (2.60 mSv ), the Ulyanovsk region (2.03 mSv ), the Yamalo-Nenets Autonomous Okrug (1.93 mSv ) and the Republic of Buryatia (1.91 mSv ). The average individual annual effective dose of technogenic occupational exposure for part-time workers in 2021 was 1.92 mSv / year . It’s in 1.7 times higher compared to personnel A group . In 2021, two cases of exceeding the annual individual dose of 20 mSv and one case of exceeding the annual individual dose of 50 mSv for group A personnel and 12 cases of exceeding the annual individual dose of 5 mSv for group B personnel were identified . The annual individual dose of technogenic occupational exposure of 51.0 mSv ( exceeding the dose limit for group A personnel ) was registered in the Production association “ Sevmash ” in the Arkhangelsk region . In 2021, 1.54 million people lived in the radiation control areas of category I of potential hazard radiation facilities . The average annual effective dose of technogenic exposure to this category of the population due to the operation of radiation facilities was 0.018 mSv , which is only 1.8 times higher than the annual effective dose of 0.01 mSv , corresponding to a negligible radiation risk and 55 times less than the average annual dose limit for the population , equal to 1.0 mSv . In general , the radiation situation at the radiation facilities of the Russian Federation is quite stable and complies with safety requirements . Technogenic exposure of the population and personnel due to the normal operation of technogenic sources of ionizing radiation is the least significant radiation factor , both for individual exposure doses and for the collective exposure dose to the population of the Russian Federation. In 2021, only less than 24 thousand persons of group A personnel received annual effective dose of technogenic occupational exposure exceeding 2.0 mSv , which is comparable to the average annual effective dose of natural exposure (3.36 mSv ) received by the entire population of Russia. The collective annual effective dose to the population of the Russian Federation due to the operation of radiation facilities in 2021 was less than 0.1% of the dose from all sources .

The article presents the analysis of the structure of computed tomography diagnostics according to the forms of the federal state statistical observation (radiation-hygienic passports in 2011–2021, forms № 3-DOZ in 2011-2021 and forms № 30 in 2014–2020) in order to assess the status of CT diagnostics in the Russian Federation and identify the main trends in the development of this type of radiation diagnostics and patient doses. In 2011–2021, there was a sharp development of CT diagnostics in the Russian Federation – an increase in the number of CT examinations per 1000 people (up to a factor of 5.9 – from 32 CT examinations per 1000 people to 189 CT examinations per 1000 people) and the contribution of CT in the collective dose from medical diagnostic exposure (3 times from 26% to 77%). The number of CT examinations per 1 CT device from 2014 to 2019 increased by 2 thousand (52%), and in 2020 by another 1.85 thousand (32% compared to 2019) and reached 7.7 thousand. The increase in the number of CT examinations was mainly due to the increased use of CT equipment. The main contribution to the structure and collective dose of computed tomography in 2021 is made by examinations of chest (58%/65%), abdomen (8%/14%), pelvis and hips (3%/4%), skull and maxillofacial area (18%/7%). In 2011-2021 for chest CT examinations, the average effective dose was in the range from 4.2 to 5.9 mSv per examination, for abdomen – from 6.5 to 9.2 mSv, for pelvis and hips – 5 to 6.7 mSv, for skull and maxillofacial area – 1.5 to 2.4 mSv. The COVID-19 pandemic in 2020-2021 caused a change in the structure of CT examinations and collective dose in the Russian Federation – the chest CT examinations occupied the first place of the contribution to the number of examinations and the collective dose. The number of CT examinations per 1000 people and the contribution of CT to the collective dose from medical diagnostic exposure in the Russian Federation were significantly lower than those in foreign countries (up to a factor of 3.5 in the number of CT examinations per 1000 people and up to a factor of 1.6 of the contribution of CT to the collective dose).

We have summarized, analyzed and assessed data on radiation accidents and incidents that occurred on the territory of the Russian Federation for the period from 2010 to 2022. The data are presented in the Data bank of radiation accidents and incidents of the Information and Analytical Center of Rospotrebnadzor on radiation safety, in the form of federal statistical observation No. 18 “Information on the sanitary condition of the subject of the Russian Federation”, and in radiation-hygienic passports of territories. The objective of the study was to conduct a comparative analysis of information on radiation accidents for the period from 2010 to 2022 contained in the above-mentioned sources. The objective of the study was to perform a comparative analysis of information on radiation accidents for the period from 2010 to 2022 contained in the above-mentioned sources. Comparison of the number of radiation accidents in dynamics has shown the presence of discrepancies between the studied data sources, lack of systematicity of these discrepancies, and multidirectional trends in the number of radiation accidents. From 2010 to 2022, in the Data bank of radiation accidents and incidents of the Information and Analytical Center of Rospotrebnadzor on radiation safety were registered 2,690 cases of radiation accidents in 71 subjects of the Russian Federation, in Forms No. 18 – 2,469 cases in 67 subjects, in radiation-hygienic passports of territories – 2,457 cases in 76 subjects. Differences in the structure of data provision have been established: in the data bank and Form No. 18 radiation accidents are classified, but at the same time the principles of classification coincide partially; there is no classification in the radiation-hygienic passport of territories. The analysis showed that no information on radiation accidents was received from four regions during the study period. Among the subjects that provided information, only six regions have coincidence of data on all sources. Some regions were identified where information was provided to some data bases but not to others. In five regions, a range of more than 50 cases was detected; the coefficient of variation in the number of radiation accidents between sources exceeded 33% in 53 subjects. The identified discrepancies demonstrate the lack of a systematic approach to the procedure for providing information on radiation accidents, which may be related to the failure to fully comply with the requirements for providing information to Rospotrebnadzor and the St. Petersburg Research Institute of Radiation Hygiene after Prof. P.V. Ramzaev, contradictions in the list of information to be provided in Rospotrebnadzor’s offices, and difficulties in determining by Rospotrebnadzor’s offices in the subjects of the Russian Federation what information is to be reported in this or that form of statistical observation.

This study is focused on the description of management of data on the exposure of the Russian population for the State report on the evaluation of sanitary-epidemiological well-being of public in the Russian Federation, that was presented by the Federal service of surveillance on consumer rights protection and human wellbeing . It is shown that the mains sources of data on the radiation situation and public exposure are system of social-hygienic monitoring , Joint state system of control and accounting of public doses ; and radiationhygienic passportization , functioning under the control of Rospotrebnadzor facilities .

Analysis of levels of exposure of public of the Russian Federation by sources of ionizing exposure is one of main parts of the activities conducted by the Federal Service for Surveillance on Consumer Rights Protection and Human Wellbeing. Data on the doses of public of the Russian Federation from medical exposure on facility, regional and federal levels is collected using the form of federal governmental statistical surveillance № 3-DOZ “Data on patient doses from medical X-ray examinations”, that is active since 2000. For the last 20 years there were no significant updates of the form № 3-DOZ. According to the decision of the Board of the Rospotrebnadzor from 11.09.2020, a complex program on update and modernization of form № 3-DOZ was initiated, that has resulted in the approvement of new form № 3-DOZ by the order of Rosstat № 880. The form has been significantly changed to reflect the modern condition of X-ray diagnostics in the Russian Federation. The aim of the current study was to analyze main components of medical exposure dose data collection system that required update and modernization. The study was performed based on the results of assessment of the forms № 3-DOZ from different medical facilities and regions in 2015-2020. The results of the study allowed developing main approaches to the update of the form № 3-DOZ that were implemented in a new edition of the form.

Radiation detriment is a basic measure which is currently applied to assess health risks caused by exposure to ionizing radiation. This concept was developed by the International Commission on Radiological Protection (ICRP) more than 30 years ago; it has both certain advantages and drawbacks that limit the scope of its possible application. A certain drawback is that this value is used exclusively to assess effects produced on health by radiation thus making it ineligible for correct comparative analysis of different risks. This review focuses on contemporary scientific papers devoted to various approaches to calculating radiation detriment. There is also an attempt to analyze whether it is possible to apply the WHO methodology for assessing burden of disease as a basis for calculating universal risk rates taking into account effects produced by exposure to harmful environmental factors on population health. A possibility to use DALY (disability-adjusted life years) estimate is considered as one of possible approaches to harmonizing health risk assessment methodologies. DALY is among estimates that are frequently used to assess population health when solving various tasks in public healthcare. The review dwells on discussing whether it is advisable and feasible to gradually change a methodology for calculating radiation detriment in order to use the effective dose as a measure of health risk more correctly.

Computed tomography has become the main method of early diagnostics of COVID-19 during the pandemic of the novel coronavirus infection. Based on results of computed tomography of the chest it is possible to diagnose viral pneumonia associated with COVIS-19, to quickly assess the lung damage volume and severity of changes, to perform quick routing of patients and to start antiviral treatment. Hence, 2020 was associated with a rapid increase in the number of computed tomography examinations with corresponding changes in the structure of X-ray diagnostics. The aim of the current study was to evaluate the impact of the pandemic of the novel coronavirus infection on the structure of X-ray diagnostics and collective doses from medical exposure in the Russian Federation in 2019-2020. The study was based on the results of analysis of the federal state statistical surveillance forms №3-DOZ and №30 as well as on the data on Covid-19 morbidity in the regions of the Russian Federation. The results of the study indicate that there were no significant changes in the structure of X-ray diagnostics in 2020 compared to 2019 except for the increase in the number of computed tomography examinations. Their contribution to the total number of X-ray examinations has increased to 8,2% in 2020 compared to 4,6% in 2019. Contribution of other imaging modalities to the total number of X-ray examinations has not changed significantly. In 2020 the number of X-ray examinations decreased by 20% in average, varying from 6% for diagnostic nuclear medicine to 42% for interventional examinations. At the same time, the number of computed tomography examinations has rapidly increased by 60%. The structure of collective dose from medical exposure has significantly changed in 2020. Contribution of computed tomography to the collective dose in 2020 accounted for to 74% compared to 57% in 2019. Contribution of other imaging modalities has decreased by the factor of 1,5-2. Contribution of radiography examinations has decreased to 10,5% compared to 19% in 2019. Collective doses have correspondingly decreased by 20-30% for all imaging modalities except for computed tomography. Collective dose from computed tomography has increased by 71% compared to 2019. The number of all X-ray examinations in the Russian Federation has decreased by 12%: from 294 million in 2019 to 258 million in 2020. Collective dose from medical exposure has rapidly increased in 2020 by 30% to 115 thousand man. -Sv compared to 88 thousand man. -Sv in 2019. In average, in regions of the Russian Federation in 2020 each second computed tomography examination has been performed as a part of COVID-19 diagnostics with 2,3 computed tomography examinations per person infected with COVID.

In the event of radiation accidents and incidents related to a possible threat to public health, one of the tools for forming health-saving behavior of the population, ensuring the social acceptability of protective measures and reducing social tension is crisis communication. Nuclear and radiation emergencies associated with the potential for radioactive contamination of large areas or the impact on the population can become the basis for the emergence of resonant information events. Properly organized crisis communication with the population in such situations is one of the necessary conditions for the effectiveness of emergency response. The article analyzes the impact on crisis risk communication of some features of nuclear and radiation events that have occurred in recent years. These events have had a significant impact on the possibility or impossibility of following the general principles of crisis communication, and provides examples of recommendations for adjusting information work if it is impossible to strictly follow the general principles of crisis communication in real circumstances. The study made it possible to identify the following features of the development of specific crisis situations that influenced the course of crisis communication and created a number of difficulties: 1) the latent nature of the early phase of the accident; 2) absence or deliberate concealment of information about a radiation accident; 3) the transboundary nature of the accident; 4) hidden (secret) nature of information about the accident; 5) an increase in the level of radiation anxiety among the population of the territories not affected by the accident; 6) the rapid formation and spread of myths; 7) projecting artistic images on a real accident. The analysis of the influence of the features of radiation accidents and incidents on the crisis communication allowed us to come to the following conclusions: 1) crisis communication is an important component of emergency response, affecting both the psychoemotional state of the population and the effectiveness of emergency measures related to the actions or inaction of the population; 2) the development of means of information interaction and methods of dissemination and consumption of information requires a revision of traditional methods of information work with the population; 3) the information should be timely, objective, consistent and understandable both for the public and for non-specialists in the field of radiation hygiene responsible for making management decisions; 4) information should not be presented in the form of short messages without explanations; 5) contradictory aggressive information received by the population from different sources may cause distrust of official sources of information; 6) if you do not provide up-to-date and objective information about the accident, the public’s trust is very easy to lose and very difficult to restore.

The assessment of the radiation risk based on the data of the radiation-hygienic passports of the territories makes it possible to give a brief quantitative characteristic of the negative impact of sources of ionizing radiation on the health of the population of various regions of the Russian Federation at the population level. The calculation of individual indicators of radiation risk for the population of particular region of the Russian Federation is a time-consuming task that requires referring to radiation-hygienic passports of territories for particular years. Therefore, the purpose of the performed work was to develop specialized software designed to assess the indicators of radiation risk to the population of the Russian Federation according to the data of the radiation-hygienic certification system of territories. Automation of the calculation of radiation risk allows not only to simplify the calculation procedure but also to carry out a spatial-temporal analysis of risk in dynamics for different regions of the Russian Federation over long periods. The methodological basis for the software development is guideline MR 2.6.1.0145-19 “Calculation of radiation risk according to the data contained in the radiation-hygienic passports of the territories to provide a comprehensive comparative assessment of the radiation safety status of the population of the subjects of the Russian Federation”. To achieve the set goal, two computer programs were developed: 1) to automate the process of calculating radiation risk based on the information contained in the radiation-hygienic passports of territories, a computer program “Calculation of radiation risk indicators according to RGPT data”; 2) for the spatial visualization of the calculations, a specialized geographic information system “Radiation risks of the population of the Russian Federation according to radiation-hygienic certification data”. The computer programs developed in the course of the work allow an automated calculation of radiation risk based on the data of radiation-hygienic passports of territories, visualize the spatially distributed results of calculating radiation risk, carry out a preliminary assessment of the state of radiation safety, based on the data contained in radiation-hygienic passports of territories using radiation risk indicators.

This study is focused on the analysis of the results of the functioning of the Federal Databank on the doses to the public of the Russian Federation from natural and man-made modified radiation background as a part of Joint governmental system of control and accounting of the doses from ionizing exposure in 2001-2020. The mean individual annual effective dose of the public of the Russian Federation from natural sources of ionizing exposure, calculated based on the data from all measurements in 2001-2020, is equal to 3,36 mSv/year. The study includes the analysis of the problems and perspectives of the improvement of the system of the data collection on the levels of exposure of the public of the Russian Federation from natural sources.

The use of computed tomography (CT) for the diagnostics of COVID-19 in the Russian Federation led to significant changes in the structure of X-ray diagnostics and levels of medical exposure of the patients. This study was aimed at the preliminary operative assessment of changes in the structure and collective dose from CT examinations in several representative hospitals, regions and on the level of the Russian Federation. The results of the study indicate that during the transformation of hospitals from general medical practice into dedicated COVID-19 facilities, the number of CT examinations increased up to 30%; the collective dose from CT exams increased up to a factor of 1.5. During a partial transformation of a medical facility into the hospital with separate COVID-19 departments, the increase in the number of CT examinations in the facility was more significant (up to a factor of 2 or more). These numbers correspond to 1.5 - 2.5 chest CT examinations (from 1 to 6) per patient admitted to hospital with COVID-19 diagnosis; and 1.2 chest CT examinations per patient in outpatient facilities, including a mandatory CT scan for the staging of COVID-19. The collective dose from CT examinations in the Russian Federation for March-June period of 2020 increased by the factor of 2 (from 16k man-Sv to 32k man-Sv); the collective dose of COVID-19 patients was about 12k man-Sv. For a more detailed and reliable assessment of the dynamics of changes in the structure of diagnostic radiology and levels of radiation exposure of patients in the Russian Federation, data collection in the regions of the Russian Federation and individual medical facilities will continue.

The article presents results of the analysis of information on the doses of technogenic exposure of personnel and the population due to the normal operation of radiation facilities, exposure of the population due to natural sources and technogenically altered radiation environment, and medical exposure of patients. The data were obtained using the Unified System of Individual Dose Control of the RF citizens for 2019. The analysis was carried out on the basis of the data contained in the forms of state statistical observation No. 1-DOZ (personnel individual doses), No. 2-DOZ (emergency doses), No. 3-DOZ (patients’ exposure doses) and No. 4-DOZ (population exposure doses from natural and technogenically impacted background) for 2019 submitted by the organizations and territories, the state sanitary and epidemiological supervision of which was carried out by Rospotrebnadzor and FMBA of Russia. The article used data obtained within the framework of Radiation-Hygiene passportization. In 2019, 18430 organizations dealing with technogenic sources of ionizing radiation submitted forms No. 1-DOZ with the information on the doses to personnel with a total number of 247934 people, of which 227723 people belonged to the personnel group A and 20211 person to the personnel group B. For these groups, the doses were assessed based on results of individual dosimetric control. In 2019, according to the Unified System of Individual Dose Control data, the average individual annual effective dose of technogenic exposure to the personnel group A was 1.19 mSv, and for the personnel group B it was 0.64 mSv. The total number of X-ray and radiological diagnostic procedures performed in the Russian Federation in 2019 exceeded 306.5 million, or 2.09 procedures per a citizen. The average annual effective dose of medical radiation exposure per one resident of Russia in 2019 was 0.62 mSv, and per procedure — 0.31 mSv. The submittedforms No. 4-DOZ of the constituent entities of the Russian Federation for 2019 contained results of the measurements of dose rate of gamma radiation in 9179 wooden houses, 11,307measurements in low-rise stone houses, 121323 measurements in multi-storey stone houses and 229342 measurements in open areas. These also contained results of 3930 measurements of radon levels in wooden houses, 5071 measurements in low-rise stone houses and 46896 measurements in multi-storey stone houses, as well as the results of 19444 analyses of the levels of natural radionuclides in drinking water. The average annual effective dose of radiation to residents of the Russian Federation from natural sources, according to all measurements for the period from 2001 to 2019, was 3.36 mSv. The article provides Appendices with the final forms of Unified System of Individual Dose Controlfor the Russian Federation for 2019. Data for the forms have been obtained on the basis of summarizing the information contained in the forms of state statistical observation No. 1-DOZ, 3-DOZ and 4-DOZ of the constituent entities of the Russian Federation.

A sociological survey was conducted in the Leningrad Region in 2016. In total, 1,363 respondents over 18 years of age were interviewed, including 401 respondents residing in the area of the main nuclear industry facility in the region namely the Leningrad nuclear power plant in the urban district Sosnovy Bor. The aim of the study was to investigate the interest of the population of the Leningrad Region and Sosnovy Bor in obtaining information on various aspects of radiation safety, depending on the gender and age of respondents, perception of the environmental situation in the region of their residence, as well as the confidence level in various sources of information. Respondents ‘ interest study of information about radiation and radiation safety issues was revealed that interest to such information is twice higher in Sosnovy Bor than the respondents of the Leningrad region have one. The highest level of confidence among all in the study participating respondents is the information, where Emergency Situations Ministry officers, scientists and specialists are the source one.

The article presents the results of the generalized analysis of the data on staff, patient, and public doses from ionizing radiation obtained from the Unified System of Individual Dose Control for 2017. The analysis is conducted on the basis of the annual data from the forms of Federal State Statistical. Observation No.1-DOZ (staff individual doses), No.2-DOZ (doses from radiation accidents), No.3-DOZ (patient doses) and No.4- DOZ (public doses from natural and technogenically impacted background). The information is submitted by the organizations and territories under the supervision of the Rospotrebnadzor and FMBA of the Russian Federation. The article is based on the data obtained within the framework of Radiation-Hygiene passportization. In 2017, 18 324 organizations working with the artificial radiation sources submitted the form No.1-DOZ. The form No.1-DOZ contains data on 235 271 staff individual doses, 215 290 of the staff group A and 19 981 the staff group B with individual monitoring. In 2017, the average individual dose for the staff group A was 1,23 mSv, the staff group B – 0,67 mSv. In 2017, 13 036 healthcare organizations submitted the form No.3- DOZ. According to the No.3-DOZ data, more than 286 mln. X-ray procedures were conducted in the Russian Federation in 2017. An average dose per capita from medical exposure was 0,55 mSv/year and a mean dose per an X-ray examination was 0,28 mSv. In 2017, the form No.4-DOZ contained data on 8 130 measurements of gamma-radiation dose rate in wooden houses, 1 557 measurements in one-storey stone houses, 126 550 measurements in multi-storey stone houses and 178 138 measurements on the open ground As well as the results of 4 417 measurements of radon concentration levels in wooden houses, 5 971 measurements in one-storey stone houses, 57 461 measurements in multi-storey stone houses. The public average effective dose from natural ionizing radiation sources corresponded to 3.34 mSv/year, the average values for the subjects of the Russian Federation fall in the range from 2,15 mSv/year (Nenets Autonomous Okrug) to 8,9 mSv/year (Altai republic). The article includes the Annexes with the final generalized forms of the Unified System of Individual Dose Control in 2017 based on the forms of statistical observations No. 1-, 3- and 4-DOZ of the subjects of the Russian Federation.