辐射变色薄膜的质子辐照响应
Response of radiochromic film to proton irradiation
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摘要: 用J-2.5质子静电加速器提供的质子束，对研制的一种高灵敏度新型辐射变色膜进行质子辐射响应研究。该变色膜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，质子能量为2.0 MeV，辐照注量为1.0×1010～1.0×1012 cm-2。用光谱响应测试薄膜的辐射效应显示：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；用图像分析仪分析辐照后靶材的光密度发现，图像的光密度随聚焦斑距离的增大而减小；用分光光度计测试其吸收光谱发现，主吸收峰值出现在660 nm附近，且吸收峰处的响应吸光度与质子注量具有较好的线性关系；对新型变色薄膜辐照后持续效应的研究表明，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 high sensitive radiochromic film has been developed by using poly (vinyl butyral) as the base and using acetylene-type compounds as the organic dye material, and was tested with the J-2.5 proton electrostatic accelerator, with proton energy of 2.0 MeV, irradiation fluence of 1.0×1010 to 1.0×1012 cm2. The tests of radiation effects show that, the color of the radiochromic film changes from pink to blue, and the optical density decreases along with the increase of the focus spot distance. Absorbance spectrum analysis shows that, the peak in the visual region locates around 660 nm. There is a linear relationship between absorbency and proton-flux for irradiation at the same proton energy. The response of the film can be measured immediately after irradiati
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Key words:
- radiochromic film /
- proton irradiation /
- absorbency response /
- proton dosimeter
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