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Energy calibration of charged particle detectors using discrete and continuous energy spectra of 137Cs
Applied Radiation and Isotopes ( IF 1.6 ) Pub Date : 2020-10-19 , DOI: 10.1016/j.apradiso.2020.109484
C.-H. Lee , J. Seon

An improved method for energy calibration of particle detectors is presented utilizing both the discrete and continuous spectra from the conversion electrons and beta particles of a radioisotope of 137Cs. This method considers the instrument response against the discrete spectrum from the conversion electrons at 624.22 keV and the continuous spectrum from the beta particles emitted by the unique first forbidden transition in the energy range of approximately 120–513 keV. The instrument response is determined by fitting model functions to the measurements, from which the energy scale and energy resolution of the instrument are derived. Inclusion of the beta particles in this method enables a determination of the energy scale in a broader energy range as well as the DC-offset and non-linearity of the instrument. This is an improvement from the conventional method that only utilizes a mono-energetic peak from the conversion electrons. A detailed description of the procedure is provided, from constructing the model functions to determining the instrument response. Results of the method, as successfully applied to a space-borne instrument, are provided to demonstrate the method.



中文翻译:

使用137 Cs的离散和连续能谱对带电粒子检测器进行能量校准 

提出了一种改进的粒子检测器能量校准方法,该方法利用了137位放射性同位素的转换电子和β粒子的离散光谱和连续光谱Cs。此方法考虑了仪器对624.22 keV转换电子的离散光谱和β粒子在大约120–513 keV能量范围内唯一的第一次禁制跃迁发射的连续光谱的响应。通过将模型函数拟合到测量值来确定仪器的响应,从中得出仪器的能量规模和能量分辨率。通过在该方法中包含β粒子,可以确定较宽的能量范围内的能量规模以及仪器的DC偏移和非线性。这是对仅利用转换电子的单能峰的常规方法的改进。提供了该过程的详细说明,从构建模型功能到确定仪器响应。该方法的结果已成功应用于星载仪器,以证明该方法。

更新日期:2020-10-30
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