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首页> 外文期刊>Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine >A New Approach to Quench Correction when Measuring ~(241)Pu in the Presence of Pu-α by Supported-disc Liquid Scintillation Spectrometry
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A New Approach to Quench Correction when Measuring ~(241)Pu in the Presence of Pu-α by Supported-disc Liquid Scintillation Spectrometry

机译：支撑圆盘液体闪烁光谱法测定Pu-α存在下〜（241）Pu时的淬火校正新方法

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摘要

It is widely recognized that the accurate measurement of β-emitting ~(241)Pu in the presence" of α-emitting Pu nuclides, by supported-disc liquid scintillation spectrometry and pulse shape analysis, necessarily involves a correction for the mis-classification of a small fraction of the α-induced events'. What has not been clear is how best to correct for the quenching associated with the (almost) unavoidable variability in source quality of discs prepared by electrodeposition in the course of theroutine analysis of environmental samples. The latter results in a reduction in the detection efficiency for ~(241)Pu and an increase in the mis-classification of a events. It also gives rise to a shift of the α and β spectra to lower energies. In this paper, a novel approach is described in which the shift in the α peak, as measured by LS spectrometry, relative to that of an unquenched standard, represents the parameter by which both the α to β cross-talk and the β efficiency are determined using appropriate sets of quenched standards. The method has been tested with replicate samples of intercomparison materials and confirmed by thermal ionization mass spectrometry.
机译：人们普遍认识到，通过支撑盘液体闪烁光谱法和脉冲形状分析，在存在“α发射Pu核素”的情况下，准确测量β发射〜（241）Pu的方法必然涉及对β的错误分类的校正。在环境样品的常规分析过程中，如何最好地校正与（几乎）不可避免的通过电沉积制备的碟片源质量的（几乎）不可避免的变异性相关的淬灭。后者导致〜（241）Pu的检测效率降低，并增加了事件的错误分类，也导致了α和β光谱向较低能量的移动。描述了一种新颖的方法，其中通过LS光谱法测量的α峰相对于非猝灭标准品的峰位移代表了确定α至β串扰和β效率的参数设置适当的淬火标准。该方法已通过比较材料的重复样品进行了测试，并通过热电离质谱法进行了确认。

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