Uncertainty evaluation in activity measurements with HPGe using two relative methods

Authors

DOI:

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

Keywords:

uncertainty, gamma emitters, germanium detectors, radionuclide metrology

Abstract

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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Author Biographies

M C M de Almeida , Instituto de Radioproteção e Dosimetria

Laboratório de Metrologia de Radionuclídeos 

J U Delgado , Instituto de Radioproteção e Dosimetria

Laboratório de Metrologia de Radionuclideos 

R L Silva , Instituto de Radioproteção e Dosimetria

Laboratório de Metrologia de Radionuclídeos 

R Poledna , Instituto de Radioproteção e Dosimetria

Laboratório de Metrologia de Radionuclídeos 

R S Gomes , Instituto de Radioproteção e Dosimetria

Laboratório de Calibração 

A L Ferreira Filho , Instituto de Radioproteção e Dosimetria

Laboratorio de Metrologia de Radionuclídeos 

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Published

2022-12-20

How to Cite

de Almeida, M. C. M., Delgado, J. U., Silva , R. L., Poledna, R., Gomes, R. S., & Ferreira Filho , A. L. (2022). Uncertainty evaluation in activity measurements with HPGe using two relative methods. Brazilian Journal of Radiation Sciences, 10(4), 1–13. https://doi.org/10.15392/2319-0612.2022.2070

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