Use of the Grubbs test to study the homogeneity of a NaI(Tl) detector

Authors

  • Leticia Lins Ramos Instituto de Engenharia Nuclear https://orcid.org/0000-0001-6509-1247
  • César Marques Salgado Instituto de Engenharia Nuclear
  • William Luna Salgado
  • Roos Sophia Dam
  • Francisco Oliveira Ferreira

DOI:

https://doi.org/10.15392/bjrs.v9i1A.1389

Keywords:

photopeak counts, NaI(Tl) detectors, homogeneity of detector

Abstract

The NaI(Tl) detector is one of the most used in gamma ray spectrometry because it presents high counting efficiency for gamma rays in a wide range of energy. The crystal can have a lower efficiency that can be indicated by the effects of its aging by several factors such as: the reaction of sodium iodide with magnesium oxide, absorption of water vapor by crystal, and problems related to photomultiplier. In an experiment, several measures can be take and when a doubt exists between one of the measured values it is possible to use a statistical test. Grubbs test is designed to verify the presence of extreme values in sample observations. This paper presents a methodology that has the objective of evaluating the homogeneity of a NaI(Tl) scintillation detector using the Grubbs test to validated the crystal homogeneity. The study pre-established five differents locations in frontal area of detector where measurements were performed using a 137Cs standard source in order to calculate the standard deviation.

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Author Biography

Leticia Lins Ramos, Instituto de Engenharia Nuclear

Serviço do Reator Argonauta (SEREA)

References

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GRINEV B.V.; NIKULINA R.A.; BERSHININA S.P.; VINOGRAD E.L. Investigation of the aging of scintillation detectors. Scientific Planning Department, V. 70, p. 50-51, 1991.

RAMOS L.L.; SALGADO C.M. Estudo do volume sensível efetivo de detectores de NaI(Tl) utilizando o código MCNP-X. INTERNATIONAL NUCLEAR ATLANTIC CONFE-RENCE – INAC, São Paulo, Brazil, October 4-9, 2015.

GRUBBS F. E.. Procedures for detecting outlying observations in samples. Technometrics, Maryland, United States of America, 1969.

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Published

2021-04-30

How to Cite

Ramos, L. L., Salgado, C. M., Salgado, W. L., Dam, R. S., & Ferreira, F. O. (2021). Use of the Grubbs test to study the homogeneity of a NaI(Tl) detector. Brazilian Journal of Radiation Sciences, 9(1A). https://doi.org/10.15392/bjrs.v9i1A.1389

Issue

Section

The Meeting on Nuclear Applications (ENAN) 2019

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