Schwahofer Andrea, Feist Harald, Georg Holger, Häring Peter, Schlegel Wolfgang
Department of Radiation Therapy, Vivantes Clinic Neukoelln, Berlin, Germany; Medical Physics in Radiation Therapy, German Cancer Research Center, Heidelberg, Germany.
Department of Radiation Therapy, Ludwig-Maximilians-University (LMU), Munich, Germany.
Z Med Phys. 2017 Mar;27(1):13-20. doi: 10.1016/j.zemedi.2016.02.003. Epub 2016 Mar 11.
The aim of this study has been the experimental determination of the energy dependent dose-to-water response of TLD600 and TLD700 thermoluminescent detectors (Harshaw) in X-ray beams with mean photon energies from about 20 to 200keV in comparison with Co gamma rays and 6MV X-rays. Experiments were carried out in collaboration with the German secondary standard laboratory PTW Freiburg. The energy dependent relative responses of TLD600 and TLD700 thermoluminescence detectors were determined at radiation qualities between 30kV and 280kV. The overall uncertainty of the measured values was characterized by standard deviations varying from 1.2 to 3%. The present results agree with previous studies on the energy dependent dose-to-water response of TLD100. As an application example, the results were used to measure doses associated with X-ray imaging in image-guided radiotherapy.
本研究的目的是通过实验测定TLD600和TLD700热释光探测器（哈肖公司）在平均光子能量约为20至200keV的X射线束中的能量依赖水吸收剂量响应，并与钴γ射线和6MV X射线进行比较。实验是与德国二级标准实验室PTW弗莱堡合作进行的。在30kV至280kV的辐射质量下测定了TLD600和TLD700热释光探测器的能量依赖相对响应。测量值的总体不确定度以1.2%至3%的标准偏差表征。目前的结果与先前关于TLD100能量依赖水吸收剂量响应的研究一致。作为一个应用实例，这些结果被用于测量图像引导放射治疗中与X射线成像相关的剂量。
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