Uncertainty evaluation in activity measurements with HPGe using two relative methods

Autores

DOI:

https://doi.org/10.15392/2319-0612.2022.2070

Palavras-chave:

uncertainty, gamma emitters, germanium detectors, radionuclide metrology

Resumo

Radionuclide metrology laboratories aim to provide radioactive standards for detector calibrations in nuclear safety areas with low uncertainties.  Such standards are applied in nuclear industries, according to the requirements of monitoring programmes. The standard radionuclides of 133Ba, 152Eu and 166mHo are suitable to the determination of efficiency curves in HPGe detectors due to their multi-gamma emissions, which are intense and well separate in the spectrum. With efficiency curves it is possible to do the measurements without needing to use standards. In this work was made a verifying of the uncertainties obtained for the two relative methods: comparative (sample-standard) and efficiency curve. The total uncertainties obtained by sample-standard method varied from 0.4 to 1.2 % (k=1). The results using efficiency curve method are between 0.9 to 2.2 % (k=1).

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Biografia do Autor

  • Maria Candida Moreira de Almeida, Instituto de Radioproteção e Dosimetria

    Laboratório de Metrologia de Radionuclídeos 

  • Jose Ubiratan Delgado, Instituto de Radioproteção e Dosimetria

    Laboratório de Metrologia de Radionuclideos 

  • Ronaldo Lins Silva , Instituto de Radioproteção e Dosimetria

    Laboratório de Metrologia de Radionuclídeos 

  • Roberto Poledna, Instituto de Radioproteção e Dosimetria

    Laboratório de Metrologia de Radionuclídeos 

  • Regio S Gomes, Instituto de Radioproteção e Dosimetria

    Laboratório de Calibração 

  • Alfredo L Ferreira Filho , Instituto de Radioproteção e Dosimetria

    Laboratorio de Metrologia de Radionuclídeos 

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Publicado

20-12-2022

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Uncertainty evaluation in activity measurements with HPGe using two relative methods. Brazilian Journal of Radiation Sciences, Rio de Janeiro, Brazil, v. 10, n. 4, p. 1–13, 2022. DOI: 10.15392/2319-0612.2022.2070. Disponível em: https://bjrs.org.br/revista/index.php/REVISTA/article/view/2070. Acesso em: 17 jul. 2025.