A method to correct for temperature dependence and measure simultaneously dose and temperature using a plastic scintillation detector

作者：Therriault Proulx Francois^*; Wootton Landon; Beddar Sam

来源：Physics in Medicine and Biology, 2015, 60(20): 7927-7939.

DOI：10.1088/0031-9155/60/20/7927

• scintillator
• plastic scintillation detector
• temperature
• dosimetry
• radiation therapy

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 degrees 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 degrees 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.

• 出版日期2015-10-21