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The Lanthanum Halide scintillator detectors have been widely used for nuclearspectroscopy experiments because of their excellent energy and timeresolutions. Despite having these advantages, the intrinsic alpha and betacontaminations in these scintillators pose a severe limitation in their usagein rare-event detections. In the present work, pulse shape discrimination (PSD)with a fast digitizer has been shown to be an efficient method to separate theeffect of alpha contamination from the spectrum. The shape of the beta spectrumhas been generated with the help of Monte Carlo based simulation code, and itscontribution has been eliminated from the spectrum. The reduction in thebackground events generated by both intrinsic beta and alpha activities hasbeen demonstrated. The present study will encourage the application of thesedetectors in low cross-section measurement experiments relevant to nuclearastrophysics.

Elimination of the effect of internal activity in LaCl3:Ce scintillator