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).

Downloads

Download data is not yet available.

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 

References

RAJPUT, M.U., AHMAD, M., AHMAD, W., Characteristic absolute efficiency response curves of a high purity germanium detector in the energy range 50-1500 keV., J. Radioanal. Nucl. Chem. v.251 (3), p.457, 2002 .

MOREL, J. X and Gamma Spectrometry, LMRI/CEA/87/188, CEN- Saclay (in French), 1987 .

FROSIO, T., MENAA, N., DUCHEMIN, C., RIGGAZ, N., THEIS, C. A New Gamma Spectroscopy Methodology Based On Probabilistic Uncertainty Estimation and Conservative Approach Appl. Radiat. Isot. V. 155 (108929) , p. 1-18, 2020 . DOI: https://doi.org/10.1016/j.apradiso.2019.108929

LEPY, M.C., PEARCE, A., SIMA, O. Uncertainties in Gamma-ray Spectrometry, Metrologia v. 52, p. 3, 2015 . DOI: https://doi.org/10.1088/0026-1394/52/3/S123

KAMINSKI, S., JACOBI, A., WILHELM, CHR. Uncertainty of Gamma-ray Spectrometry Measurement of Environmental Samples due to Uncertainties in Matrix Composition, Density and Sample Geometry . Appl. Radiat. Isot. V. 94, p. 306-313 , 2014 . DOI: https://doi.org/10.1016/j.apradiso.2014.08.008

BE, M.M., CHISTE, V., DULIEU,C., BROWNE,E., CHECHEV,V., KUZMENKO,N., HELMER,R., NICHOLS, A., SCHONFELD, E., DERSCH, R. Table of Radionuclides, Sèvres, BIPM-5, 2010 .

BERNARDES, E.M.O., DELGADO, J.U., TAUHATA, L., SILVA, C.J., IWAHARA, A., POLEDNA, R., PASCHOA, A.S. 166mHo: a multi- standard for the calibration of Ge spectrometers, Appl.Radiat. Isot. v. 56 , p. 157, 2002 . DOI: https://doi.org/10.1016/S0969-8043(01)00182-8

DELGADO, J.U., MOREL, J., ETCHEVERRY, M., Measurements of photon emission probabilities from the decay of 226Ra and daughters , Appl. Radiat. Isot., v. 56, p. 137, 2002 . DOI: https://doi.org/10.1016/S0969-8043(01)00179-8

PIBIDA, L., HSIEH, E., FUENTES-FIGUEROA, A., HAMMOND, M.M., KARAM,L. Software studies for germanium detectors data analysis, Appl. Radiat. Isot . v. 64 (10-11) , p. 1313, 2006 . DOI: https://doi.org/10.1016/j.apradiso.2006.02.076

SILVA, M.A.L., ALMEIDA, M.C.M., DELGADO, J.U. Half-life of radionuclides determined by reference source method J. Radioanal .Nucl. Chem. v. 264 (3), p. 571, 2005 . DOI: https://doi.org/10.1007/s10967-005-0755-0

VIDMAR ,T., KORUN, M. Calibration of L-S curves for coincidence summing corrections in gamma ray spectrometry Nucl. Instrum. Methods in Phys .Res . Section A, v. 556 (2), p. 543, 2006 . DOI: https://doi.org/10.1016/j.nima.2005.11.052

CALIN, M. R. , CALIN, M. A. , DONE, L. , DRUKER, A. E. , CALIN, A.C. Assessment of calibration parameters for gamma-ray spectrometry systems J. Radioanal . Nucl. Chem. v. 288, p. 547, 2011 . DOI: https://doi.org/10.1007/s10967-010-0961-2

KOSKINAS, M. F., MOREIRA, D. S. , YAMAZAKI, I. M., TOLEDO, F. , BRANCACCIO, F. , DIAS, M. S. Primary Standardization of 57Co Appl. Radiat . Isot,.v. 68 (7-8) , p. 1344, 2010 . DOI: https://doi.org/10.1016/j.apradiso.2009.12.011

LU, X and WANG, G. Absolute radioactivity measurement of 60Co , 137Cs and 166mHo by 4πβ-γ anti-coincidence method Appl. Radiat. Isot. V. 58, p. 365, 2003 . DOI: https://doi.org/10.1016/S0969-8043(02)00303-2

DIAS, M. S. , TAKEDA, M. N. , KOSKINAS, M. F. Application of Monte Carlo simulation to the prediction of extrapolation curves in the coincidence technique Appl. Radiat. Isot. V. 64 , p. 1191, 2006 . DOI: https://doi.org/10.1016/j.apradiso.2006.02.019

YAMADA, T. , NAKAMURA, Y. , KAWADA, Y. , SATO, Y. , HINO, Y. Standardization of 152Eu and 154Eu by 4πβ-γ coincidence method and 4π (β + γ) integral counting Appl. Radiat. Isto, v. 64, p. 1220, 2006 . DOI: https://doi.org/10.1016/j.apradiso.2006.02.078

IWAHARA, A. , SILVA, M. A. L. , CARVALHO FILHO, A. E. , BERNARDES, E. M. O. , DELGADO, J. U. Determination of disintegration rates and γ-ray emission probabilities of 65Zn and 241Am , Appl. Radiat . Isot . v. 63, p. 107, 2005 . DOI: https://doi.org/10.1016/j.apradiso.2005.01.013

Downloads

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

Issue

Section

Articles

Most read articles by the same author(s)

1 2 > >>