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Radiation Protection Dosimetry Advance Access published online on November 30, 2004
Radiation Protection Dosimetry, doi:10.1093/rpd/nch420
Copyright © 2004 Oxford University Press.
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Received July 24, 2004
Revised September 15, 2004
Accepted October 26, 2004

SCIENTIFIC AND TECHNICAL PAPER

UNCERTAINTIES EVALUATION FOR ELECTRETS BASED DEVICES USED IN RADON DETECTION

M. Caresana 1*, F. Campi 1, M. Ferrarini 1, L. Garlati 1, and A. Porta 1

1 Dipartimento di Ingegneria Nucleare, Politecnico di Milano, via Ponzio 34/3, 20133 Milano, Italy

* To whom correspondence should be addressed.
M. Caresana, E-mail: marco.caresana{at}polimi.it


  Abstract

In recent years uncertainty evaluation in measurements has achieved great importance. National and international standards offer guidelines to evaluate uncertainties, but these procedures are, until now, not well understood by the operators. This is because of the fact that a detailed uncertainty evaluation is not an easy operation and a standard rule to apply in all cases is not available. Every measurement procedure has its own uncertainty evaluation. In this work, attention is focused upon the electret ion chambers (EIC), widely used in radon concentration measurements. Measurements of gamma radiation sensitivity are performed in a secondary standard calibration laboratory and measurement of radon concentration sensitivity is performed in a radon chamber 0.8 m3 in volume. Raw data are analysed to evaluate the calibration factors and the combined uncertainties are determined. The aim of the work is to give a practical method to assess the uncertainty of a radon measurement.


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