Uncertainty evaluation in activity measurements with HPGe using two relative methods
DOI:
https://doi.org/10.15392/2319-0612.2022.2070Keywords:
uncertainty, gamma emitters, germanium detectors, radionuclide metrologyAbstract
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).
- Views: 193
- PDF Downloads: 149
- XML Downloads: 62
Downloads
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
Published
How to Cite
Issue
Section
License
Copyright (c) 2022 Brazilian Journal of Radiation Sciences
This work is licensed under a Creative Commons Attribution 4.0 International License.
Licensing: The BJRS articles are licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
