自适应峰形切削法扣除γ能谱全谱本底

Estimate of the Scattering Background of γ-Ray Spectrum by Adaptive Peak Removing Technology

为更精准地扣除γ能谱低能段散射平台计数,探讨了一种自适应峰形切削法扣除γ能谱全谱本底的解谱方法。该方法依据峰区计数与平台技术分布规律的差异,采用两点间切线交点作为下一次本底初值,通过不断迭代趋近实际本底线。实验结果表明:该方法对低能段散射平台具有较强的跟随能力,特征峰区本底估计能力与改进SNIP法相当。

Adaptive Peak Removing Technology（APRT） is proposed to estimate the scattering background in the low - energy region, which cannot be effectively removed by any kind of background elimination method within full -energy region at present. APRT is based on different distribution characteristic of peak area counts and platform counts. The tangent of the deltoids is seen as the next background values, which converge towards the scattering background by iterations. Applying modified SNIP method, fourier transform estimation and this method to both the synthesized spectrum and measured spectrum of LaBr3 detector, the results show that this method is the better way to solve the above problem and similar to modified SNIP method in other respects.