Bias in the measurement of radon gas using ionization chambers: Application to SIR

Two main non-destructive techniques can be used to measure standard 222Rn gas ampoules: well-type ionization chambers and gamma-ray spectrometry, the former being used in the Système International de Référence (SIR) for international comparison purposes. The reliability of these techniques requires...

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Bibliographic Details
Published in:Applied radiation and isotopes 2018-04, Vol.134 (SI), p.13-17
Main Authors: Pierre, S., Sabot, B., Cassette, P., Liang, J., Courte, S., Ferreux, L., Ratel, G.
Format: Article
Language:English
Subjects:
Gamma-ray spectrometry
Ionization chamber
Nuclear Experiment
Physics
Rn-222
SIR
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Summary:Two main non-destructive techniques can be used to measure standard 222Rn gas ampoules: well-type ionization chambers and gamma-ray spectrometry, the former being used in the Système International de Référence (SIR) for international comparison purposes. The reliability of these techniques requires that the variability of the flame-sealed gas glass ampoules used have a negligible influence on the detector response. This variability is studied in this work by considering three parameters: the volume of the ampoule, the position of the sealing point and the thickness of the glass. Results showed that variability of the gas ampoules induced measurement bias larger than the uncertainty of the standard sources. •Flame-sealed glass ampoules are used for SIR gas international comparisons.•Ampoules of 222Rn are measured in ionization chamber and gamma-ray spectrometer.•Ampoules parameters are studied: volume, position of sealing point and thickness.•Discrepancy on glass thickness is observed.•Ampoules discrepancy can bias the comparisons.
ISSN:0969-8043
1872-9800
DOI:10.1016/j.apradiso.2017.10.040