辐射变色薄膜剂量计的退火效应  

The annealing effect of radiochromic film dosimeter

作　　者：王硕[1] 陈家胜[1] 何捷[1] 孙鹏[1] 

机构地区：[1]四川大学物理科学与技术学院辐射物理及技术国家教育部重点实验室,四川成都610065

出　　处：《功能材料》2013年第5期752-755,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(10875083);四川省应用技术研究与开发资助项目(07FG001-025)

摘　　要：制备了一批辐射变色薄膜,利用紫外线辐照该薄膜,辐照后薄膜由无色变为蓝色,并在670nm处出现一吸收峰,吸收峰的吸光度对辐照剂量有良好的线性响应关系。对辐照后的薄膜进行了退火实验,当温度升高到45℃后,出现一新的吸收峰(545nm),随着温度进一步升高670nm峰逐渐消失,545nm峰逐渐升高。当温度达到110℃时,670nm峰完全消失,545nm峰达到稳定,薄膜也相应地由蓝色变为粉红色。薄膜颜色的变化主要是由于其内部分子结构发生了变化:由碳碳三键共轭(无色)变为辐照后的碳碳三键和碳碳双键不在一个平面内的共轭(蓝),最后变为退火后的碳碳三键和碳碳双键在一个平面内的共轭(粉红)。进一步的红外光谱分析也证实了对薄膜结构变化的解释。In this study, a batch of radiochromic films were prepared. The cdor of the film became blue after ir- radiating by low energy density of ultraviolet radiation using CL-1000UV cross-linking instrument. An absorp- tion peak appeared at 670nm. The absorption peak absorbance has a good linear response relationship of radia- tion dose. The annealing experiments of the film were conducted after the irradiation. When the temperature was raised to 45 ℃, a new absorption peak appeared at 545nm. Along with the further elevation of the tempera- ture, 670nm peak gradually disappeared and 545nm peak rose gradually. When the temperature reached 110℃, 670nm peak completely disappeared, 545nm peak was stabilized, and the color of the film was also correspond- ingly changed from blue to pink. The change of radiochromic film after irradiation could be expounded by infra- red spectroscopy which showed that carbon-carbon triple bond conjugated （colorless） changed into a carbon-car- bon triple bond and carbon-carbon double bond conjugate in different planes （blue） ,finally into the carbon-car- bon triple bond and carbon-carbon double bond conjugate in a same plane （red）.

关 键 词：辐射变色薄膜剂量计 退火效应 红外光谱分析 变色机理 

分 类 号：R144.1[医药卫生—公共卫生与预防医学] TL818[核科学技术—核技术及应用]