摘要
以丙烯酰胺凝胶为载体、类丁二炔（10,12-二十五碳二炔酸）囊泡为显色物质,合成了一种新型辐射变色复合材料,并对其性能进行了系统研究。辐照后复合材料由无色透明变为蓝色,主吸收峰出现在660nm附近,其吸光度与吸收剂量具有线性关系。辐照前后类丁二炔囊泡的拉曼光谱分析发现,随着吸收剂量的增加,类丁二炔的拉曼位移在2 200cm-1处的共轭三键振动吸收峰逐渐减弱并消失,2 100cm-1处的三键-双键共轭吸收峰增强且向低波数区域移动,表明类丁二炔囊泡单体在辐照过程中发生了聚合反应。剂量率、分次辐照和扩散效应等因素对类丁二炔凝胶复合材料的影响研究结果显示：在2~40Gy/min的范围内,剂量响应随剂量率的变化较小;分次辐照与单次辐照的结果一致;类丁二炔囊泡在丙烯酰胺凝胶中无明显扩散效应。综上,该复合材料有望用于三维空间的剂量测定,剂量测量范围为100~2 000Gy。
A new type of radiochromic gel composite,which was composed of acrylamide gels as carrier and diacetylene（10,12-pentacosadiynoic acid）vesicles as chromogenic agent,was prepared,and its radiochromic properties were studied.The color of the gel composites changed from colorless to blue after irradiation.The main absorption peak at around 660 nm appears in the UV-Vis spectroscopy,and its absorbance has a linear relationship with the absorbed dose.For comparison purpose,the diacetylene vesicles were irradiated and analyzed by Raman spectroscopy.The results show that the peak at2 200cm-1 in Raman shift corresponding to C≡C—C≡C vibration gradually attenuates and disappears,and the peak at near 2 100cm-1 corresponding to C≡C—C=C vibrations moves to a lower wavenumber with the increasing absorbed dose.These results indicate that the diacetylene vesicles are polymerized gradually during irradiation.The dose-rate effect,the fractionated-irradiation effect and the diffusion-effect of the diacetylene gel composites were studied additionally.The dose rate shows negligible influence on dose response in the range of 2-40Gy/min.The dose response with the fractionated irradiation up to a certain dose is consistent with a single continuous irradiation.There is no obvious diffusion effect in diacetylene vesicles embedded in acrylamide gels.Based on the results above,the diacetylene gel composites are promising to be used in measuring the three-dimensional space dose,and the range of dosage measuring is about 100-2 000 Gy.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2016年第6期983-989,共7页
Atomic Energy Science and Technology
基金
中国工程物理研究院科学技术发展基金资助项目(2013B0301035)
国家自然科学基金资助项目(81301934)
