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Radon concentration in indoor occupational environments in Aomori Prefecture, Japan
The 222Rn concentrations in indoor workplaces were measured in Aomori Prefecture, Japan, and the results are reported here. This survey was part of a program to measure background natural radiation dose rate in the prefecture where the first Japanese nuclear fuel cycling facilities are now under con...
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Published in: | Journal of environmental radioactivity 2003, Vol.67 (2), p.91-108 |
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Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The
222Rn concentrations in indoor workplaces were measured in Aomori Prefecture, Japan, and the results are reported here. This survey was part of a program to measure background natural radiation dose rate in the prefecture where the first Japanese nuclear fuel cycling facilities are now under construction.
The survey of the
222Rn concentrations in indoor workplaces was carried out at 107 locations from 1996 to 1998. The
222Rn concentrations were measured for approximately one year at each site with passive Rn detectors, which used a polycarbonate film for counting α-rays and could separate concentrations of
222Rn from
220Rn. Weeklong measurements of
222Rn concentration and working level were carried out with active detectors to get the ratio of
222Rn concentration during working hours to non-working hours as well as equilibrium factors in selected locations.
Diurnal variation of
222Rn concentration depended on building structure, air-conditioning, time of day and day of the week (week days or weekend). The
222Rn concentration during working hours was generally lower than that in non-working hours. Although the annual average
222Rn concentration in indoor occupational environments was higher than that in dwellings, radiation dose for Aomori Prefecture residents from Rn in the former was 14% of the total indoor dose by Rn because of the lower concentration in working hours and lower occupancy factor. |
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ISSN: | 0265-931X 1879-1700 |
DOI: | 10.1016/S0265-931X(02)00162-5 |