Identification, prevention and response to events in medical exposure are an integral part of the radiation safety system in medicine. The existing approaches in the Russian Federation, presented in the current regulatory and methodological documents, need to be updated and harmonised with international practice. At the same time, it is advisable to focus on events related with patients, because of potential overexposure of workers and public is presented comprehensively. The study presents suggestions for amendments to terminology in medical exposure events of patients and development of classification of the events criteria as well. Schemes to identify and respond to events in medical exposure that related to overexposure of patients are defined. It is advisable to implement the results of the study into the section on radiation safety in medical exposure in the updated version of OSPORB-99/2010.

Sources of ionizing radiation are an integral part of modern healthcare and are widely used for diagnostic and therapeutic purposes. One of the key aspects of the safe use of ionizing radiation in medicine is the competence of medical professionals in the field of radiation protection. The aim of this study is to investigate the level of awareness and understanding of radiation protection among interventional radiologists in the Russian Federation. The research was conducted through an online survey. The link to the questionnaire was shared in communities of interventional radiologists in social networks. A total of 78 interventional radiologists participated in the survey. The questionnaire consisted of 26 questions, 11 of which focused on assessing knowledge of radiation protection. Each question addressed a fundamental aspect essential for understanding and application in medical practice. None of the respondents answered all radiation protection questions correctly. The average score among all participants was 6.1 out of a maximum of 11. The level of knowledge did not significantly depend on years of professional experience (p>0,05). The most challenging questions concerned the biological effects of ionizing radiation. Most participants assessed their knowledge of radiation safety as satisfactory (46,1%) or good (33,3%). Self-assessment of knowledge levels also did not significantly depend on professional experience (p>0,05). As preferred sources of information on radiation safety, interventional radiologists identified online resources, scientific conferences, educational materials, and training courses. Currently, no regularly updated, unified information online resource in Russian is available. Developing such a resource represents the most cost-effective approach to ensuring and improving the awareness of interventional radiologists regarding radiation protection. Simultaneously, efforts should be directed toward enhancing the quality of training courses on radiation protection.

The article presents results of a study on the tritium concentrations in seawater samples collected from September 2023 to June 2024 in coastal waters of the Far Eastern regions of the Russian Federation, including Primorsky, Kamchatka, and Khabarovsk Krais; Sakhalin and Magadan Oblasts; and the Chukotka Autonomous Okrug. The aim of the study is to determine the backgrounds values of tritium volume activity. The low-background liquid scintillation spectrometer-radiometer for alpha and beta radiation "Quantulus 1220” was used to determine the baseline tritium content in 185 seawater samples collected by specialists from the territorial bodies of Rospotrebnadzor in six subjects of the Far Eastern Federal District. The results indicate that the specific activity levels for the observation period from September 2023 to June 2024 were below 10.0 Bq/kg in samples collected from the coastal waters of the Far Eastern regions of the Russian Federation. The recorded tritium levels are significantly below the intervention level for drinking water (7600 Bq/L) as per NRB-99/2009, which applies to desalinated seawater.

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 article presents results of a study of the radiation environment on territories adjacent to the sites of the “Globus-4” and “Gorizont-1” peaceful nuclear explosions in the Komi Republic. Field survey was carried out in July 2021. The work provides an assessment of the radiation situation in terms of the main indicators: ambient dose equivalent rate, the content of anthropogenic radionuclides in soil, tritium in the water of water bodies and drinking water supply sources in the settlements nearest to the sites of the peaceful nuclear explosions. The values of gamma radiation ambient dose equivalent rate in all the surveyed territories are at the level of fluctuations of natural regional radiation background and amounted to 0.03 – 0.07 µSv/h in the territory of peaceful nuclear explosion “Globus-4”, 0.01 – 0.05 µSv/h in the territory of “Gorizont-1”. No contaminated soil areas with anthropogenicradionuclides were detected. Tritium activity concentration in water samples does not exceed 5 Bq/kg, which is typical for global levels of this radionuclide in water bodies. The study has shown that the radiation situation in the territory of peaceful nuclear explosions “Globus-4” and “Gorizont-1” meets the requirements of SanPiN 2.6.1.2819-10 “Ensuring radiation safety of the population living in the areas of (1965 – 1988) nuclear explosions for peaceful aims” and currently poses no threat to public health. A conservative dose estimate of additional anthropogenic exposure of individuals from the population from tritium intake with water from centralised water supply sources was 0.065 µSv/year. Longterm radiation safety of the researched territories requires organisation of radiation monitoring, determination of protected zone boundaries and installation of readable information signs warning about radiation hazard and prohibition of economic activities.

Radiation events (accidents) appearance is an integral part of the use of ionizing radiation sources in medicine in general and nuclear medicine in particular. To minimize the negative impact on patients, workers, and public due to such events, it is necessary to have reliable information about real prevalence of the radiation events (accidents). The current work presents the analysis of the radiation accidents with medical ionizing radiation sources registered in the “Data bank of radiation accidents and incidents” of the Rospotrebnadzor Information and Analytical Centre for Radiation Safety and the results of workers questionnaires conducted in 25 nuclear medicine departments (about 30% of all nuclear medicine departments in the Russian Federation). The results of the analysis showed that the most common registered radiation accidents in the “Data bank of radiation accidents and incidents” are identification of passengers with high external dose rate as well as identification of waste contaminated by medical radionuclides. The results of the questionnaire showed that the most common radiation accidents (events) in nuclear medicine are contamination of work clothes or work surfaces with radionuclides, or patient fluids containing radionuclides; conducting examination without proper referral; extravasation of radiopharmaceutical. Existing systems of identification and registration of radiation accidents do not allow to identify radiation events (accidents) specific to nuclear medicine. The further research aimed at developing a classification of radiation events (accidents) in medicine and methods for responding to such events are feasible.

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.

Introduction of new methods of nuclear medicine, X-ray diagnostics and therapy using medical sources of ionizing radiation inevitably leads to an increase in the number and types of accidents (abnormal situations). In international practice in recent years, special attention has been paid to the prevention of radiation accidents and incidents from medical exposure. The main focus is put on accidental exposure (overexposure) of patients in X-ray and radionuclide diagnostics and therapy. These approaches are implemented in Russian regulatory and methodological documents in a limited and formal way. The main attention is paid to large-scale technogenic radiation accidents, and accidents (abnormal situations) from medical irradiation are undeservedly ignored. The aim of the work was to analyze the terminology and classification of radiation accidents and incidents from medical exposure in the Russian Federation and foreign countries to develop proposals to improve approaches to their classification within the framework of revision of existing regulatory and methodological documents. The results of the work indicate that it is necessary to actualize Russian approaches to the definition and classification of radiation accidents in medicine considering the specifics of medical exposure. For this purpose, it is advisable to introduce different levels of accidents (abnormal situations), differing from each other by the scale of impact and consequences for patients, workers and public. Considering the absence of elaborated scenarios of accidents (abnormal situations) in Russian regulatory and methodological documents, such gradation can be borrowed from international regulatory documents provided that it is adapted to the specifics and realities of the Russian health care system

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.

Sites of peaceful nuclear explosions pose a potential radiation hazard to the territories of the Russian Federation, primarily due to the possible release of radioactivity from the explosion cavity into aquifers and onto the earth's surface. Therefore, it is essential to conduct regular monitoring of anthropogenic radionuclides in drinking water sources in settlements located near the sites of peaceful nuclear explosions. Tritium serves as an indicator of the potential release of other anthropogenic radionuclides. Monitoring its levels in water bodies in regions where peaceful nuclear explosions were perfomed, and comparing this data with that from Roshydromet across the Russian Federation, allows for an assessment of the reliability of the engineering barriers between the central explosion zone and the environment with respect to preventing radionuclide migration into aquifers. One method for evaluating the reliability of these barriers is the assessment of tritium specific activity in drinking water sources. This article presents results of the study involving 220 water samples collected from drinking water sources (wells, boreholes, springs, central water supply systems) and surface waters within 167 settlements across 17 subjects of the Russian Federation, where 50 peaceful nuclear explosions were conducted between 1965 and 1988. The samples were collected between May and September 2024 in the settlements within a 30 km radius of a peaceful nuclear explosion site. Measurements of tritium specific activity were performed using the Quantulus 1220-003 alpha-beta spectrometric radiometer. The research revealed that the specific activity of tritium in underground water sources is significantly lower (Student's test p<0,05) than in surface waters. The average specific activity levels of tritium in boreholes, rivers, and lakes were 3.0, 3.45, and 4.31 Bq/kg, respectively. The specific activity of tritium in drinking water sources within the regions of peaceful nuclear explosions was found to be at the background levels recorded by Roshydromet, ranging from 1.1 to 5 Bq/kg.

The designation of peaceful nuclear explosions as special radioactive waste imposes serious requirements to the territory of the explosion, its boundaries, and stakeholders informing about the prohibition of economic activities within these boundaries. The acting Sanitary Norms and Rules SanPiN 2.6.1.2819–10 “Ensuring radiation safety of the population living in areas where nuclear explosions were conducted (1965–1988) for peaceful purposes” do not define the size of the boundaries of protected zones. The aim of this paper is to analyze the scientific literature on the structure of deformation changes in the Earth’s interior due to peaceful nuclear explosions and to justify quantitative ratios on the basis of which the size of protected zones can be estimated. The quantitative ratios were selected on the basis of a comparative analysis of the literature data. Using the ratios values made it possible to calculate the radii of deformation changes (cavities, crushing zones, fracturing zones, and zones of residual deformations) in various rocks. It is shown that the maximum values of fracturing radii for peaceful nuclear explosions carried out on the territory of the Russian Federation in hard rocks and in plastic rocks do not exceed 200 m and 250 m, respectively.

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 .

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.

The form of federal governmental statistical surveillance № 3-DOZ, titled Data on patient doses from medical X-ray examinations, has changed significantly by the order of Rosstat N 880. In particular, the structure of the forms has been revised: studies involving high doses were dedicated from the rest; the section on radionuclide diagnostics has been redesigned; the information on the levels of patient exposure when using individual radionuclides and in hybrid studies have been displayed; information on the number of radiological studies and collective doses for pediatric patients have been introduced; and the number of studies for which typical (average) effective doses of patients are presented has been reduced. The structure of the updated form № 3-DOZ is presented within the framework of this work. In this article, recommendations for filling out № 3-DOZ have been developed in order to increase the reliability of the data provided and reduce the number of procedural errors. This work is a continuation of the article Vodovatov A.V., Chipiga L.A., Bratilova A.A., Druzhinina P.S., Shatskiy I.G., Petryakova A.V., Sarycheva S.S., Biblin A.M., Akhmatdinov R.R., Kapyrina Yu.N., Soldatov I.V., Puzyrev V.G., and Ryzhov S.A. Update of the federal governmental statistical surveillance form № 3-DOZ Data on patient doses from medical X-ray examinations. Perquisites for the update, published in the journal Radiatsionnaya Gygiena (2023. Vol. 16, N 2. P. 126136. DOI: https://doi.org/10.21514/1998-426X-2023-16-2-126-136).

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.

This study presents results of radiation-hygienic surveys of the Bryansk Oblast settlements bordering the Republic of Belarus. The data were obtained in the course of implementation of measures of the “Program of joint activities of Russia and Belarus within the framework of the Union State for the protection of the population and rehabilitation of the territories affected by the Chernobyl NPP accident” in 2019–2022. The first part of the study presents a general characteristic of the current state of the problem of returning the residents of radioactively contaminated territories to normal living conditions and provides information on the settlements of the surveyed region. The modern demographic composition of the population is considered; the structure of private subsidiary plots is investigated. The results described in this part of the study indicate the main ways, which are relevant for the formation of the internal exposure dose of the public at the current stage of the radiation accident.