We fabricated polyvinyl chloride (PVC) films containing leuco crystal violet (LCV) to develop a radiochromic material with high sensitivity to radiation. For comparison, polyvinyl butyral, polystyrene, and poly(methyl methacrylate) films containing LCV were additionally prepared. The absorption spectra of these films before and after X-ray irradiation were measured. The change in the absorbance of the PVC film at 600 nm was 2.9–32 times those of other films at a radiation dose of 4 kGy. This result suggested that the generation of crystal violet (CV + ) proceeded efficiently by radicals generated from PVC. The addition of 1 wt% trichloroacetic acid (TCA) to a PVC film containing LCV increased the change in absorbance 1.2 times. This result suggested that the radicals generated by the decomposition of TCA induced the generation of CV + . The sensitivity to radiation of the film was 4.2–28 times greater than those of conventional plastics containing leuco dyes.

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基于含无色结晶紫的聚氯乙烯薄膜的放射性变色剂量计的研制

我们制造了包含无色结晶紫（LCV）的聚氯乙烯（PVC）膜，以开发对辐射具有高敏感性的放射性致变色材料。为了比较，另外制备了含有LCV的聚乙烯醇缩丁醛，聚苯乙烯和聚（甲基丙烯酸甲酯）薄膜。测量了这些膜在X射线照射之前和之后的吸收光谱。在4 kGy的辐射剂量下，PVC膜在600 nm处的吸光度变化是其他膜的2.9-32倍。该结果表明，由PVC产生的自由基有效地进行了结晶紫（CV +）的产生。向含有LCV的PVC膜中添加1 wt％的三氯乙酸（TCA），吸光度变化增加了1.2倍。该结果表明TCA分解产生的自由基诱导了CV +的产生。