某些添加剂对PVG膜剂量计的效应  

EFFECTS OF ADDITIVES ON PVG DOSIFILM

作　　者：陈文琇[1] 刘爱国[1] 

机构地区：[1]北京师范大学化学系,北京100875

出　　处：《辐射研究与辐射工艺学报》1997年第1期15-19,共5页Journal of Radiation Research and Radiation Processing

摘　　要：在聚乙烯醇缩丁醛（PVB）薄膜中添加LMG及有机卤代物（RX），研制成功PVG剂量计，并对其性能作了探讨[1]。结果表明，60Coγ射线辐照能引发体系中隐色的LMG氧化生成绿色的孔雀绿（MG+），生成数量与吸收剂量成正比。通过改变基体中LMG或RX的浓度，可以获得不同的线性剂量响应关系（即单位厚度的吸光度差△A／L，mm-1与剂量，kGy之间的关系），对合理控制PVG剂量膜的组成具有指导意义。此外，还初步探讨了该体系的辐射变色机理。Dosifilm PVG was a new radiochromic film dosimeter composed of matrix material polyvinyl butyral (PVB), leuco malachite green (LMG) and additive halogenated organic compounds (RX), etc. The control of the dose range on PVG dosifilm was examined. The addition of halogenated compounds played an important role in the radiation reaction of LMG beyond the concentration of LMG.Bromide was more effective than chloride in this system, the oxidative species were X·and X2-. PVB with N-bromosuccinimide (NBS) induced the oxidation of LMG before irradiation. The reaction mechanism of PVG was discussed. Different linear ranges of radiation response on PVG dosifilm could be controlled by alternating the relative concentrations of halogenated compounds and LMG.

关 键 词：聚乙烯醇 缩丁醛 薄膜 辐射剂量 剂量计 

分 类 号：TL818[核科学技术—核技术及应用]