Effect of inorganic salt on the dose sensitivity of polymer gel dosimeter
Effect of inorganic salt on the dose sensitivity of polymer gel dosimeter
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DOI：
10.1016/j.radphyschem.2012.03.001
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发表时间：
2012-07-01
影响因子：
2.9
通讯作者：
Tominaga, Takahiro
中科院分区：
文献类型：
--
作者：
Hayashi, Shin-ichiro;Fujiwara, Fumiya;Tominaga, Takahiro
研究了非过渡金属氯化物无机盐对甲基丙烯酸基聚合物凝胶剂量计剂量灵敏度的影响。剂量-R-2响应是从磁共振成像数据获得的。在辐照过程中，还直接测量了凝胶中因放热聚合反应而产生的温升。因此，在含有无机盐的聚合物凝胶剂量计中，观察到R-2响应的显著增加，特别是使用氯化镁。含1.0M氯化镁的凝胶的感度约为不含氯化镁的凝胶的2.8倍。通过温度测量发现，随着盐浓度的增加，聚合速率也随之增加。这些结果表明，无机盐在甲基丙烯酸基凝胶中对辐射引发自由基聚合起到了促进剂的作用。(C)2012爱思唯尔有限公司。保留所有权利。
The effect of inorganic salts, non-transition metal chlorides, on the dose sensitivity of methacrylic-acid-based polymer gel dosimeter is investigated. Dose-R-2 responses are obtained from magnetic resonance imaging data. Temperature increase due to exothermic polymerization reaction in the gel is also measured directly during irradiation. As a result, substantial increases in R-2 response are observed in the polymer gel dosimeter containing inorganic salt, especially with MgCl2. The sensitivity of the gel with 1.0 M MgCl2 is approximately 2.8 times higher than that of without MgCl2. As the salt concentration increases, an increase of polymerization rate is also observed via the temperature measurements. These results indicate that inorganic salt acts as an accelerator for radiation-induced free-radical polymerization in methacrylic-acid-based gel. (C) 2012 Elsevier Ltd. All rights reserved.