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Frequency gradient analysis (FGA) effectively discriminates neutrons andgamma rays by examining the frequency-domain features of the photomultipliertube anode signal. This approach is insensitive to noise but is inevitablyaffected by the baseline drift, similar to other pulse shape discriminationmethods. The baseline drift effect is attributed to the factors such as powerline fluctuation, dark current, noise disturbances, hum, and pulse tail infront-end electronics. This effect needs to be elucidated and quantified beforethe baseline shift can be estimated and removed from the captured signal.Therefore, the effect of baseline shift on the discrimination performance ofneutrons and gamma rays with organic scintillation detectors using FGA isinvestigated in this paper. The relationship between the baseline shift anddiscrimination parameters of FGA is derived and verified by an experimentalsystem consisting of an americium-beryllium source, a BC501A liquidscintillator detector, and a 5 GSPS 8-bit oscilloscope. Both theoretical andexperimental results show that the estimation of the baseline shift isnecessary, and the removal of baseline drift from the pulse shapes can improvethe discrimination performance of FGA.

Baseline drift effect on the performance of neutron and gamma ray discrimination using frequency gradient analysis