A NaI(Tl)-based radioactive noble-gas monitoring system used for radiation monitoring

Radioactive noble-gas monitoring is necessary in nuclear facilities. A NaI(Tl)-based radioactive noble-gas monitoring system was developed. In order to increase the amount of air to be measured, the sample vessel of this system was larger than that of other systems, and was pressurized to about 5 × ...

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Bibliographic Details
Published in:Applied radiation and isotopes 2020-09, Vol.163, p.109230-109230, Article 109230
Main Authors: Li, HuiBin, Lei, WeiGuo, Feng, TianCheng, Huang, DingWei, Tian, ZiNing
Format: Article
Language:English
Subjects:
Memory effect
Minimum detectable concentration
Radioactive noble gas
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Summary:Radioactive noble-gas monitoring is necessary in nuclear facilities. A NaI(Tl)-based radioactive noble-gas monitoring system was developed. In order to increase the amount of air to be measured, the sample vessel of this system was larger than that of other systems, and was pressurized to about 5 × 105 Pa. In a laboratory experiment, technical ways to reduce the memory effect were investigated. In field tests, a method of spectra analysis was established and calibration coefficients and minimum detectable concentrations of 133Xe, 135Xe and 41Ar were calculated. Finally, detection ability was compared with other online monitoring systems. •Novel NaI(Tl)-based radioactive noble-gas monitoring with low minimum detectable concentration.•Methods used to reduce the memory effect in the monitoring system were investigated.•A spectrum stripping process was used in the spectrum analysis program.•Detection efficiencies of three gaseous isotopes were calculated.
ISSN:0969-8043
1872-9800
DOI:10.1016/j.apradiso.2020.109230