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目的提高NaI(Tl)γ能谱的测量精度,拓展其应用范围。方法针对NaI(Tl)γ能谱的谱型特征,利用权重最小二乘法进行解谱。结果介绍了低本底NaI(Tl)γ能谱仪的常用解谱方法,着重介绍了权重最小二乘法(WLSQ)的原理和算法,并在Matlab平台下编程。结论同一样品谱利用WLSQ求解的结果与HPGe谱仪测量的结果的偏差小于10%。
Objective To improve the measurement accuracy of NaI (Tl) γ spectrum and expand its application range. Methods According to the spectral features of NaI (Tl) γ spectra, the least square method was used to solve the spectrum. Results The commonly used method for solving the low background NaI (Tl) gamma spectrometer was introduced. The principle and algorithm of weighted least squares (WLSQ) were emphatically introduced and programmed under the Matlab platform. Conclusion The results of WLSQ analysis on the same sample spectrum are less than 10% deviation from the measurement results of HPGe spectrometer.