Nilsson Jenny, Isaksson Mats
Department of Radiation Physics, Institute of Clinical Sciences, The Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
Department of Radiation Physics, Institute of Clinical Sciences, The Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden.
Radiat Prot Dosimetry. 2015 Mar;163(4):458-67. doi: 10.1093/rpd/ncu256. Epub 2014 Aug 21.
A fast and versatile calibration of a whole body counter (WBC) is presented. The WBC, consisting of four large plastic scintillators, is to be used for measurements after accident or other incident involving ionising radiation. The WBC was calibrated using Monte Carlo modelling and the ICRP computational phantoms. The Monte Carlo model of the WBC was made in GATE, v6.2 (Geant4 Application for Tomographic Emission) and MATLAB. The Monte Carlo model was verified by comparing simulated energy spectrum and simulated counting efficiency with experimental energy spectrum and experimental counting efficiency for high-energy monoenergetic gamma-emitting point sources. The simulated results were in good agreement with experimental results except when compared with experimental results from high dead-time (DT) measurements. The Monte Carlo calibration was made for a heterogeneous source distribution of (137)Cs and (40)K, respectively, inside the ICRP computational phantoms. The source distribution was based on the biokinetic model for (137)Cs.
本文介绍了一种全身计数器（WBC）的快速通用校准方法。该全身计数器由四个大型塑料闪烁体组成，用于在涉及电离辐射的事故或其他事件后进行测量。使用蒙特卡罗建模和国际辐射防护委员会（ICRP）的计算体模对全身计数器进行了校准。全身计数器的蒙特卡罗模型是在GATE v6.2（用于断层发射的Geant4应用程序）和MATLAB中构建的。通过将模拟能谱和模拟计数效率与高能单能γ发射点源的实验能谱和实验计数效率进行比较，验证了蒙特卡罗模型。除了与高死时间（DT）测量的实验结果相比外，模拟结果与实验结果吻合良好。分别针对ICRP计算体模内（137）铯和（40）钾的非均匀源分布进行了蒙特卡罗校准。源分布基于（137）铯的生物动力学模型。
