论文部分内容阅读
目的给出全身计数器NaIγ谱中214Bi、137Cs的609.3keV、661.66keV全能峰计数率。方法采用已知活度的137Cs放射性点源进行测量,对γ谱中感兴趣区域,利用基于Matlab的非线性曲线拟合方法进行重峰分析。结果分析得出的137Cs活度测量值与已知活度间相对偏差的绝对值小于10%。结论非线性曲线拟合方法是一种简便、快捷、可靠的重峰分析方法之一。
OBJECTIVE: To give the counting rates of the all-round peaks of 214Bi and 137Cs in the NaIγ spectrum of whole body counter at 609.3keV and 661.66keV. Methods 137Cs radioactive point source with known activity was used for the measurement. The region of interest in the γ spectrum was analyzed by using nonlinear curve fitting method based on Matlab. The absolute value of the relative deviation between the measured 137Cs activity and the known activity was less than 10%. Conclusion Non-linear curve fitting method is a simple, fast and reliable one of the heavy-weight analysis methods.