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Radiation Protection Dosimetry Advance Access originally published online on February 9, 2005
Radiation Protection Dosimetry 2005 113(3):251-265; doi:10.1093/rpd/nch461
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

A least squares procedure for calculating the calibration constants of a portable gamma-ray spectrometer

F. B. Ribeiro*, D. U. Carlos, F. Y. Hiodo and E. F. Strobino

Departamento de Geofísica, Instituto de Astronomia, Geofísica e Ciências Atmosféricas da Universidade de São Paulo, Rua do Matão, 1226 Butantã, 05508-090 São Paulo, SP, Brasil

* Corresponding author: brenha{at}iag.usp.br

Received November 26 2004, amended and accepted January 10 2005

In this study, a least squares procedure for calculating the calibration constants of a portable gamma-ray spectrometer using the general inverse matrix method is presented. The procedure weights the model equations fitting to the calibration data, taking into account the variances in the counting rates and in the radioactive standard concentrations. The application of the described procedure is illustrated by calibrating twice the same gamma-ray spectrometer, with two independent data sets collected ~18 months apart in the same calibration facility.


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