Journal
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
Volume 306, Issue 1, Pages 317-323Publisher
SPRINGER
DOI: 10.1007/s10967-015-4286-z
Keywords
Ambient gamma dose rate; External exposure; High background radiation area; Internal exposure; Thoron; Yangjiang
Funding
- Ministry of the Environment in Japan
- Grants-in-Aid for Scientific Research [26670324] Funding Source: KAKEN
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A pilot study to measure ambient gamma dose rate and radon and thoron progeny concentrations was made for eight dwellings selected in Yangjiang, China. Indoor and outdoor ambient gamma dose rates were 110-370 and 100-220 nGy h(-1), respectively. Doses received from indoor terrestrial radiation were estimated to be 0.6-1.8 mSv year(-1). Radon, thoron and thoron progeny concentrations were 19-98, 18-1120 and 0.4-10.3 Bq m(-3), respectively. This pilot study showed that the position of passive-type monitors to be placed and the deployment period should be carefully determined for estimating reliable annual average concentrations.
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