Abstract A new approach combining UV and thermal treatments has been studied for improved UV dosimetry of CR-39 polymeric detector films. Prior to thermal annealing, the detector films were exposed to radiation from a UV lamp (250–263 nm) at a distance of 1 cm for different durations of 10, 20, 40, 60, 80, and 100 h. Reversing the sequence, other detector films were first thermally treated in a controlled oven at 160 °C for 1 h and then subjected to UV exposure as above. The qualitative impacts of these treatments have been analyzed by means of ultraviolet/visible (UV/Vis) spectrophotometry in the range 190–450 nm, considering optical properties such as absorbance, band-gap energy, and Urbach energy. As controls, CR-39 detector films subjected only to UV treatment and a pristine film were also examined. The obtained results revealed that the methods combining UV and thermal treatments enhanced the absorptivity for short-wavelength UV radiation, depending on the order of the treatments. The pre-treated films (UV exposure followed by thermal annealing) permitted excellent estimation of UV exposure times, as a proxy of UV dose, over the range 10–100 h.

中文翻译：

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UVC 辐射对热处理 CR-39 聚合物薄膜光学性能的影响：使用 CR-39 作为光学剂量计的新方法

摘要 为了改进 CR-39 聚合物检测器薄膜的紫外线剂量测定，研究了一种结合紫外线和热处理的新方法。在热退火之前，探测器薄膜在 1 cm 距离处暴露于来自紫外线灯（250-263 nm）的辐射，持续时间不同，持续时间为 10、20、40、60、80 和 100 小时。反过来，其他探测器薄膜首先在 160°C 的受控烘箱中热处理 1 小时，然后如上所述进行紫外线照射。已通过 190-450 nm 范围内的紫外/可见光 (UV/Vis) 分光光度法分析了这些处理的定性影响，并考虑了吸光度、带隙能量和 Urbach 能量等光学特性。作为对照，还检查了仅经过紫外线处理的 CR-39 检测器薄膜和原始薄膜。获得的结果表明，结合紫外线和热处理的方法增强了对短波长紫外线辐射的吸收率，这取决于处理的顺序。预处理的薄膜（紫外线照射后进行热退火）可以很好地估计紫外线照射时间，作为紫外线剂量的代表，在 10-100 小时的范围内。