Accurate calculation of pileup effects in PIXE spectra from first principles
Accurate calculation of pileup effects in PIXE spectra from first principles
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DOI：
10.1002/xrs.903
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发表时间：
2006-07-01
影响因子：
1.2
通讯作者：
Reis, M. A.
中科院分区：
文献类型：
--
作者：
Barradas, N. P.;Reis, M. A.
PIXE 光谱中的背景扣除一直是 PIXE 数据分析中的一个长期问题。堆积代表了对背景的重要贡献，但其在处理 PIXE 光谱的软件代码中的处理经常受到强甚至不正确的近似的影响。本文简要回顾了堆积校正的各种研究和方法，并应用基于 PIXE 谱堆积减法第一原理的解析计算。峰值贡献和连续贡献之间没有必要加以区分。计算所需的唯一参数是收集时间、放大器的整形时间和堆积抑制系统的解析时间，不需要归一化常数。计算了一系列实验 PIXE 光谱、不同计数率和放大器整形时间以及在堆积抑制系统打开和关闭时收集的光谱。计算的堆积和观察到的堆积之间的一致性非常好。版权所有 (C) 2006 John Wiley & Sons, Ltd.
Background subtraction in PIXE spectra has been a persistent problem in PIXE data analysis. Pile-up represents an important contribution to the background, but its treatment in software codes handling PIXE spectra frequently suffers from strong or even incorrect approximations. This paper gives a short review of various studies and methods of pile-up correction and applies an analytic calculation based on first principles for PIXE spectra pile-up subtraction. No distinction between peak and continuum contributions is necessary. The only parameters required for the calculation are the collection time, the shaping time of the amplifier and the resolving time of the pile-up rejection system, without any need for normalisation constants. Calculations are presented for a series of experimental PIXE spectra, for different count rates and amplifier shaping times and spectra collected with the pile-up rejection system on and off. The agreement between calculated and observed pile-up is excellent. Copyright (C) 2006 John Wiley & Sons, Ltd.