Radiochromic films (GafChromic DM 1260 and MD 55), consisting of thin, colorless transparent coatings of a polycrystalline, substituted-diacetylene sensor layer on a clear polyester base, are studied by pulse radiolysis and flash photolysis, in terms of the kinetics of their response to ionizing radiation and ultraviolet light, respectively. These films have recently been established for broad applications in radiographic imaging, nuclear medicine, and dosimetry for radiotherapy, blood irradiation, insect population control, food irradiation, and industrial radiation processing. The radiochromic reaction is a solid-state polymerization, whereby the films turn deep blue proportionately to radiation dose, due to progressive 1,4-trans additions as polyconjugations along the ladder-like polymer chains. The pulsed-electron-induced propagation of polymerization has an observed first-order rate constant of the order of 10(3) s(-1), depending on the irradiation temperature (activation energy approximate to 50 kJ mol(-1)). The W-induced polymerization is faster by about one order of magnitude (k(obs) = 1.5 X 10(4) s(-1)). In the case of the electron beam effect, the radiation-induced absorption spectrum exhibits a much slower blueshift of the primary absorption band (lambda(max) = 675 nm --> 660 nm) on the 10(-3) - 10(+1) second time scale. This effect is attributed to crystalline strain rearrangements of the stacked polymer strand units.

Summary A multinational co‐trial was organized to determine if electron spin resonance (ESR) spectroscopy could be used to monitor foods exposed to ionizing radiation. The bones of chicken legs, frog legs and pork rib bones were prepared and distributed as unknowns to the participating laboratories. In every instance, non‐irradiated bones were correctly identified as such. Moreover, irradiated bones were not only correctly identified, but relatively good estimates of the absorbed dose were obtained. An intercomparison of the different approaches used by each laboratory is discussed, and recommendations for future trials are presented.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA pulse radiolysis study of the leucocyanide of malachite green dye in organic solventsK. Bobrowski, G. Dzierzkowska, J. Grodkowski, Z. Stuglik, Z. P. Zagorski, and W. L. McLaughlinCite this: J. Phys. Chem. 1985, 89, 20, 4358–4366Publication Date (Print):September 1, 1985Publication History Published online1 May 2002Published inissue 1 September 1985https://pubs.acs.org/doi/10.1021/j100266a041https://doi.org/10.1021/j100266a041research-articleACS PublicationsRequest reuse permissionsArticle Views216Altmetric-Citations24LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access options Get e-Alerts

The disodium salt of 4-diethyl aminophenyl-4',4''-bis(3-sulfobenzyl ethyl aminophenyl)acetonitrile was made and studied. It was found to release cyanide lineraly with exposure to ionizing radiation. When administered ip to mice, it was absorbed in significant amounts and retained its ability to cleave upon irradiation. Based upon this, we gathered evidence and proposed that it is feasible to design a non-toxic compound which when exposed to ionizing radiation would yield predictable reactive end products that would remain localized and augment the effects of irradiation upon a neoplasm.