Radionuclides measurements by the relative method using a germanium detector

Authors

  • Maria Candida Moreira de Almeida Instituto de Radioproteção e Dosimetria -IRD/CNEN
  • Ronaldo Lins Silva Instituto de Radioproteção e Dosimetria IRD/CNEN
  • José Ubiratan Delgado Instituto de Radioproteção e Dosimetria IRD/CNEN
  • Roberto Poledna Instituto de Radioproteção e Dosimetria IRD/CNEN

DOI:

https://doi.org/10.21014/actaimeko.v14i4.1977

Keywords:

germanium detector, radionuclides, relative method, metrology

Abstract

The National Laboratory for Ionizing Radiation Metrology (LNMRI/IRD/CNEN) in Rio de Janeiro has conducted the standardization of various radionuclides. These standards are essential for applications in the nuclear industry, scientific research, radiation protection, and nuclear medicine. A comparative method using a high-purity germanium (HPGe) detector was employed to determine the activity of several radioactive point and ampoule sources. The standardized radionuclides included 22Na, 60Co, 133Ba, and 137Cs. The methodology ensured high precision in activity measurements, contributing to the reliability of radiometric procedures across multiple sectors. Total measurement uncertainties were maintained below 2.2 % for liquid samples and below 2.8 % for solid samples, with a confidence level of 95 % (k = 2). These results demonstrate the laboratory’s capability in producing traceable and accurate standards, reinforcing Brazil’s metrological infrastructure in ionizing radiation.

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Published

2025-12-15

Issue

Vol. 14 No. 4 (2025)

Section

Research Papers

License

Copyright (c) 2025 Maria Candida Moreira de Almeida, Ronaldo Lins Silva, José Ubiratan Delgado , Roberto Poledna

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