变色薄膜的紫外线辐照响应研究

Response of radiochromic films to UV irradiation

制备了含多芳氨基甲烷类化合物的高分子变色薄膜,经紫外线辐照后,这种薄膜随吸收剂量的不同由无色透明逐渐变为绿色,在可见光区主要吸收峰位于626 nm附近,光密度响应与辐照时间近似成线性关系.研究表明：该辐射变色薄膜变色响应随紫外线能量密度增加而增加;分次辐照能略微提高光密度响应;辐射变色薄膜响应受温度和湿度影响较大,在20～50 ℃温度范围、40%～60%相对湿度范围,响应基本稳定;卤代物添加剂可以大大提高辐射变色薄膜的响应灵敏度;受后辐照效应影响,辐照结束最初2 h内响应迅速增加,2 h后响应才基本稳定.

Radiochromic films containing a multi-arylamino methane compound were prepared, and their color changed from clear to green after irradiation under ultraviolet （UV） light. As the absorption spectrums show, the main absorption peak in the visual region locates around 626 nm, and there is a linear relationship between the response of optical density and radiation time. The response increases with UV light energy density enhancing. The response to fractioned irradiation is a little stronger than that to continuous irradiation. The response keeps constant at temperature of 20-50℃ and relative humidity 40%-60%. The sensitivity of the response is remarkably improved when halides are added into the radiochromic system. As the result of post-radiation effect, noteworthily, the response increases rapidly during the first 2 h after the irradiation and keeps stable later.