Evaluation of the uncertainty associated with sample holders in NAA measurements in LAN/IPEN

Authors

  • Guilherme Soares Zahn Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP
  • Regina Beck Ticianelli Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP
  • Mitiko Saiki Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP
  • Frederico Antonio Genezini Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP

DOI:

https://doi.org/10.15392/bjrs.v7i2A.676

Keywords:

NAA, uncertainty, sample holder

Abstract

In IPEN’s Neutron Activation Laboratory (LAN/IPEN), thin stainless steel sample holders are used for gamma spectrometry in NAA measurements. This material is very practical, but its chemical composition may be troublesome, as it presents large amounts of elements with intermediate atomic number, with attenuation factors for low-energy gamma-rays that must not be neglected. In this study, count rates obtained using different sample holders were compared. To accomplish that, an Am-241 source, with 59-keV gamma emission, was used so that low-energy gamma attenuation differences can be determined. Moreover, in order to study the energy dependence of these differences, a Ho-166m source was also used. From these results, it was possible to analyze the experimental error associated to the variations between sample holders, with the aim of introducing an addictive term to the uncertainty analysis of comparative Neutron Activation Analysis results.

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Author Biographies

Guilherme Soares Zahn, Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP

Centro do Reator de Pesquisas - CRPq

Regina Beck Ticianelli, Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP

Centro do Reator de Pesquisas - CRPq

Mitiko Saiki, Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP

Centro do Reator de Pesquisas - CRPq

Frederico Antonio Genezini, Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP

Centro do Reator de Pesquisas - CRPq

References

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WEIZHI, T.; BANGFA, N.; PINGSHENG, W.; LEI, C.; YANGMEI Z. Metrological role of neu-tron activation analysis. IA. Inherent characteristics of relative INAA as a primary ratio method of measurement, Accreditation and Quality Assurance, v. 6, p.488–492, 2001.

GREENBERG, R.; BODE, P.; DE NADAI FERNANDES, E. A. Neutron activation analysis: A primary method of measurement, Spectrochimica Acta Part B: Atomic Spectroscopy, v.66, p.193–241, 2011.

LNHB-Laboratoire National Henri Becquerel Table de Radionocléides, 2017 Available at: <http://www.nucleide.org/DDEP_WG/DDEPdata.htm>. Last accessed: 22-Nov-2017.

KNOLL, G. F. Radiation Detection and Measurement, Hoboken

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Published

2019-02-20

How to Cite

Zahn, G. S., Ticianelli, R. B., Saiki, M., & Genezini, F. A. (2019). Evaluation of the uncertainty associated with sample holders in NAA measurements in LAN/IPEN. Brazilian Journal of Radiation Sciences, 7(2A (Suppl.). https://doi.org/10.15392/bjrs.v7i2A.676

Issue

Section

The Meeting on Nuclear Applications (ENAN)

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