Research on γ background spectra in associated particle technique
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摘要: 为了解决伴随粒子法瞬发能谱实验中随机本底的影响,通过实验研究了标记中子和非标记中子与物质作用产生的瞬发信号和随机本底信号。对不同情况随机本底谱测量进行了分析,提出了小尺度样品和大尺度样品本底测量方式。研究表明:对小尺度样品,可以通过去掉样品,选择与有样品测量的谱相同的时间窗进行本底测量;对于大尺度样品,可以通过在随机本底范围选取时间窗进行本底测量。Abstract: To eliminate the influence of the random background spectra on the prompt spectra in the associated particle technique,the random background spectra induced by non-tagged neutrons and the prompt spectra induced by tagged neutrons were studied in experiment. Measurements of the random background spectra in different condition were analyzed. The methods of acquiring random spectra were proposed for the bulk and small sample of different substances. For small sample,the background spectra can be obtained without the sample by selecting the same time window as in measuring the prompt spectra with the sample. In the case of the tagged neutron range less than the volume of the sample, the background spectra can be obtained with the sample by selecting the time window during the random time.
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