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Low background gamma spectrometry employing HPGe detectors is a sensitivetechnique for measuring low-level radioactivity in environmental applications,material screening, and for rare decay searches. This work presentsspectroscopic performance evaluation and modelling of a low backgroundmeasurement setup developed at IIT Ropar in Punjab, India, to measure tracenatural radioactive elements, with a particular interest in studying low-levelradioactivity in soil and/or rock samples to generate specific inputs for lowbackground experiments. The performance test and characterization of a lowbackground cryocooled HPGe detector with relative efficiency of $\sim$33% havebeen carried out. An effective detector model has been developed using GEANT4Monte Carlo simulation to determine the response of the detector over an energyrange of 80.9-1408 keV and compared with the experimental performance of thedetector. The response of the detector obtained using Monte Carlo simulationsagrees reasonably well within 93% level of confidence, indicating only 7%deviation in the comparison. The present setup offers improved detection limitsof primordial radionuclides (U/Th and K) to measure radioactive contaminationin environmental matrices, which has been used elsewhere [1].

Spectroscopic performance evaluation and modeling of a low background HPGe detector using GEANT4