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Seasonal variations of 222Rn concentrations in the air of a tunnel located in Nagano city.

Abstract：

:The seasonal variation of 222Rn concentrations in the air of tunnels constructed during World War II at Nagano City has been investigated. The determination of 222Rn concentrations in tunnel air was performed using a solid-state nuclear track detector technique. The monthly radon concentrations changed smoothly, decreasing towards winter and increasing towards summer, and it was found that the concentrations strongly correlate with the temperature difference between the inside and the outside of the tunnel. In the innermost areas of the tunnel, the maximum concentration was observed in July, its value being about 6500 Bq m (-3). The concentrations of radon in the tunnel air decrease exponentially towards the openings of the tunnel, which indicates that the radon concentration in the tunnel is basically governed by diffusion and mixing of radon gas with air. These observations lead to the conclusion that the seasonal variation of the radon concentration in the tunnel air is mainly caused by a convection current due to a stack effect induced by the temperature difference between the tunnel air and the outside air.

journal_name

J Environ Radioact

journal_title

Journal of environmental radioactivity

authors

Muramatsu H,Tashiro Y,Hasegawa N,Misawa C,Minami M

doi

10.1016/s0265-931x(01)00085-6

subject

Has Abstract

pub_date

2002-01-01 00:00:00

pages

263-74

issue

3

eissn

0265-931X

issn

1879-1700

pii

S0265-931X(01)00085-6

journal_volume

60

pub_type

杂志文章

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