Investigating potential physicochemical errors in polymer gel dosimeters
Investigating potential physicochemical errors in polymer gel dosimeters
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研究聚合物凝胶剂量计中潜在的物理化学误差
DOI：
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发表时间：
2011
影响因子：
3.5
通讯作者：
M. Lepage
中科院分区：
文献类型：
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作者：
M. Sedaghat;R. Bujold;M. Lepage
聚合物凝胶剂量测定中的测量误差可能来源于辐照或扫描过程。与聚合反应放热性质相关的一个问题是，聚合物凝胶剂量计在照射期间释放的热量会改变其剂量响应。本文研究了外聚合反应放热对几种剂量计剂量响应的影响。此外，我们研究了热产生的几何失真是否存在于新提出的凝胶剂量计，含有高度温敏聚合物。我们的研究结果表明，尽管在一些凝胶组合物的内部温度显着增加，它们的剂量响应不受影响时，氧气被很好地从凝胶混合物中机械排出。我们还报告了一些最近开发的聚合物凝胶剂量计的显着预辐照不稳定性，但没有观察到几何失真。通过一组小的校准瓶获得的数据进行比较，从较大的phanophantomy获得的，并确定它们之间的偏差的潜在物理化学原因。
Measurement errors in polymer gel dosimetry can originate either during irradiation or scanning. One concern related to the exothermic nature of polymerization reaction was that the heat released in polymer gel dosimeters during irradiation modifies their dose response. In this paper, the effect of heat released from the exothermal polymerization reaction on the dose response of a number of dosimeters was studied. In addition, we investigated whether heat-generated geometric distortion existed in newly proposed gel dosimeters that contain highly thermoresponsive polymers. Our results suggest that despite a significant internal temperature increase in some gel compositions, their dose responses are not affected when oxygen is well expelled mechanically from the gel mixture. We also report on significant pre-irradiation instability in some recently developed polymer gel dosimeters but that geometric distortions were not observed. Data obtained by a set of small calibration vials are compared to those obtained from larger phantoms, and potential physicochemical causes of deviations between them are identified.
BANG 3 聚合物凝胶剂量计光学 CT 扫描的灵敏度校准程序。
影响因子：
3.8
作者：
Xu,Y;Wuu,Cheng-Shie;Maryanski,MarekJ
通讯作者：
Maryanski,MarekJ