✍ Scribed by S.I. Kuzina; S.V. Stovbun; A.G. Salina; V.A. Kochukov; N.Ya. Kuznetsova; A.I. Mikhailov
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The process of low-temperature (77 K) 7-radiolysis of the cellulose nitrate track-registration detector of ionizing radiation has been studied by electron spin resonance spectroscopy. The main radicals formed during the radiation-induced destruction of cellulose nitrate are IqO 2 and the polymeric matrix radicals, observed for the first time, stable up to 373 K. The concentration of these last products at 300 K did not exceed 2% of the total concentration of radicals measured at 77 K. It was found that the enhanced alkaline etching of the 7-irradiated detector was due not only to the direct radiation-induced destruction of macromolecular chains but also to the destruction of chains initiated by the active centres (of both radical and non-radical nature) generated in the cellulose nitrate molecules as a result of radiation-chemical reactions. The data on y-radiolysis allowed estimation of the average dosage in the track of or-particle with E~ = 2.8 MeV (D t = 250 kGy) and the track diameter (40-50/~).
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