G(E)法与Gravel法处理能谱-剂量转换效果研究

The Research of G(E) Function and Gravel Algorithm Managing Spectra-dose Conversion

为准确地得到γ射线的辐射剂量,对G(E)函数法和Gravel算法处理能谱-剂量的转换效果进行了研究。根据实际应用需求,采取蒙特卡罗方法模拟获取了?50 mm×50 mm NaI(Tl)探测器的Gravel法响应矩阵,并使用Matlab得到探测器的G(E)函数。使用NaI(Tl)探测器和多道谱仪系统测量标准源的能谱,分别使用G(E)法和Gravel法计算剂量值并与理论值进行比较,同时在计算过程中总结对比了两种方法的特点。

The spectrum - dose conversion method based on G （E）function and Gravel algorithm is studied to measure gamma ray dose accurately. The Gravel algorithm response matrix of Ф50 mm×50 mm NaI（33） scintillation detector is simulated by Monte Carlo software, and G（E）function is calculated through Matlab program. The gamma ray energy spectra are measured by NaI （33） scintillation detector and muhichannel analysis system with standard radiation sources. Then radiation dose values are calculated according to G （E）function and Gravel algorithm. Finally we compare the experimental values with the theoretical values, meanwhile the characteristics of two methods are summarized.