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Title: Monte Carlo calculation of the efficiency calibration curve for HPGe detectors
Authors: Bhattacharya, Taru
Nagaiah, N
Reddy, B Ram Mohan
Sharma, P K
Keywords: HPGe detector;Gamma ray spectrometry;MCNP;Radioactivity;Geological samples
Issue Date: Aug-2018
Publisher: NISCAIR-CSIR, India
Abstract: High purity germanium (HPGe) gamma ray spectrometer provides a good tool for measuring the concentrations of uranium, radium, thorium and potassium because of its high resolution. Accurate measurement of efficiency is crucial for their determination. The efficiency of a detection system varies significantly with geometry and matrix of the samples as well as energy of gamma rays. Thus, activity of samples has been determined by comparing the peak counts of samples and standards recorded under same configurations. But for geological samples, matrix varies from place to place giving samples of different densities. The activities of geological samples, especially in areas near to uranium deposits may also vary from ppm to percentage level. In such cases, computer simulations can help in calculating the efficiency of the system for different configurations and densities. Present work aims to create a computer model of HPGe detector being used at Physics Laboratory, Atomic Minerals Directorate for Exploration and Research (AMD), Bengaluru using the Monte Carlo N-Particle (MCNP) code. In this work, model obtained using the manufacturer’s parameter was modified to match the simulated efficiency curves with experimental efficiency curves. Efficiency curves were also calculated for 50, 90 and 150 g of 0.26% equilibrium U3O8 sample. The calculated results compared well with those obtained experimentally.
Page(s): 628-630
ISSN: 0975-0959 (Online); 0301-1208 (Print)
Appears in Collections:IJPAP Vol.56(08) [August 2018]

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