高感度辐射变色薄膜电子剂量计
A new highly sensitive radiochromic film electronic dosimeter
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摘要: 以聚乙烯醇缩聚物为基质，以类丁二炔化合物为有机染色材料，研制了一种高灵敏度新型辐射变色膜。采用JJ-2型范格拉夫静电加速器对变色薄膜进行剂量范围为15～90 Gy的电子束辐照，结果显示:变色薄膜颜色由粉红渐变为蓝色，并随着辐照剂量的增加而逐渐加深；分光光度计测试其吸收光谱，发现主吸收峰值出现在675 nm附近，且吸收峰处的响应吸光度与电子注量具有较好的线性关系；对变色层厚度为20～80 μm的变色膜，吸收峰处的响应吸光度与其变色层厚度也成线性关系；添加不同比例的协同剂，能提高变色薄膜的响应灵敏度;变色膜辐照后续效应微弱，辐照后可以立即测量，且对测量环境变化不敏感。Abstract: A new highly sensitive radiochromic film is developed by using poly(vinyl butyral) as the base and using acetylene-type compounds as organic dye material. It becomes blue after irradiation by an electron beam. The absorbance spectrum is analyzed and the peak in visual region locates at about 675 nm.There is a linear relationship between absorbency and e-flux when irradiated by the same electron energy. The response of absorbency is affected by the sequence radiation. A linear fitting relationship is also discovered between the sensitive layer thickness and absorbency. The sensitivety of the response can be changed when different inverse proportion of halides are added into the radiochromic system. Good stability is proved from environment analysis.
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Key words:
- radiochromic film /
- electron irradiation /
- absorbency response /
- electron dosimeter /
- co-agent
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