Open AccessOptimization of the gamma-ray spectrometry counting time based on uncertainties of radionuclides concentration in samples
Author(s) -
Marcelo Bessa Nisti,
Marcelo Francis Máduar,
C. H. R. Saueia,
Fernanda Cavalcante,
B. P. Mazzilli
Publication year - 2020
Publication title -
brazilian journal of radiation sciences
Language(s) - English
Resource type - Journals
ISSN - 2319-0612
DOI - 10.15392/bjrs.v8i2.1197
Subject(s) - gamma ray spectrometry , radionuclide , mass spectrometry , gamma spectroscopy , semiconductor detector , detector , gamma ray , radiochemistry , microcomputer , germanium , physics , analytical chemistry (journal) , materials science , nuclear physics , chemistry , computer science , optics , chromatography , optoelectronics , silicon , telecommunications , chip , quantum mechanics
This paper aims to propose an easy and fast method of optimization of the gamma-ray spectrometry counting time in determining natural radionuclides (Pb-210, Pb-212, Pb-214, Bi-212, Bi-214 and Ac-228) in order to minimize uncertainties in the concentration. The samples were measured by gamma-ray spectrometry with a hyper-pure germanium detector Canberra, 25% relative efficiency, effective resolution of 1.9 keV on the 1332.5 keV 60Co with associated electronics and coupled to a microcomputer. Multichannel Maestro A65-I model was used for spectrum acquisition and peak net area determination, and WinnerGamma/Interwinner 6.01 software was used for gamma-ray spectra analysis and to calculate the concentrations and associated uncertainties. The counting times used were 86,000 s and 150,000 s.