为了解决伴随粒子法瞬发γ能谱实验中随机γ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γ信号和随机γ本底信号。对不同情况随机本底γ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γ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。

To eliminate the influence of the random background γ spectra on the prompt γ spectra in the associated particle technique，the random background γ spectra induced by non-tagged neutrons and the prompt γ spectra induced by tagged neutrons were studied in experiment. Measurements of the random background γ spectra in different condition were analyzed. The methods of acquiring random γ spectra were proposed for the bulk and small sample of different substances. For small sample，the background γ spectra can be obtained without the sample by selecting the same time window as in measuring the prompt γ spectra with the sample. In the case of the tagged neutron range less than the volume of the sample, the background γ spectra can be obtained with the sample by selecting the time window during the random time.