A method to correct for temperature dependence and measure simultaneously dose and temperature using a plastic scintillation detector.
A method to correct for temperature dependence and measure simultaneously dose and temperature using a plastic scintillation detector.
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DOI：
10.1088/0031-9155/60/20/7927
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发表时间：
2015-10-21
影响因子：
3.5
通讯作者：
Beddar S
中科院分区：
文献类型：
--
作者：
Therriault-Proulx F;Wootton L;Beddar S
塑料闪烁探测器（PSD）适用于辐射剂量测定。然而，它们显示出一定的温度依赖性，并且需要PSD周围温度的先验知识来校正这种依赖性。我们提出了一种新的方法来纠正PSD响应值的温度变化瞬间，而不需要事先知道的温度值。除了使检测器与温度无关之外，该方法允许仅使用PSD装置进行实际温度测量。使用温控水箱，温度从室温变化到超过40°C，PSD用于测量钴-60光子束单元输送的剂量，与预期值的平均值相差在0.72%以内。在每次采集期间用PSD和热电偶测量温度，并且值彼此在1°C内。还在温暖的非稳定条件下测量了6 MV光子束的深度-剂量曲线，该曲线与室温下获得的曲线的平均值在-0.98%以内。用我们的方法证明了使PSD与温度无关的可行性，该方法还能够同时测量剂量和温度。这种新颖的方法提高了PSD的鲁棒性和通用性。
Plastic scintillation detectors (PSDs) work well for radiation dosimetry. However, they show some temperature dependence, and a priori knowledge of the temperature surrounding the PSD is required to correct for this dependence. We present a novel approach to correct PSD response values for temperature changes instantaneously and without the need for prior knowledge of the temperature value. In addition to rendering the detector temperature-independent, this approach allows for actual temperature measurement using solely the PSD apparatus. With a temperature-controlled water tank, the temperature was varied from room temperature to more than 40°C and the PSD was used to measure the dose delivered from a cobalt-60 photon beam unit to within an average of 0.72% from the expected value. The temperature was measured during each acquisition with the PSD and a thermocouple and values were within 1°C of each other. The depth-dose curve of a 6-MV photon beam was also measured under warm non-stable conditions and this curve agreed to within an average of −0.98% from the curve obtained at room temperature. The feasibility of rendering PSDs temperature-independent was demonstrated with our approach, which also enabled simultaneous measurement of both dose and temperature. This novel approach improves both the robustness and versatility of PSDs.