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Estimation of $$^{222}$$Rn flux and its effect on the atmospheric $$^{222}$$Rn concentration at Hachijo-jima island, Japan

Okura, Takehisa; Yamazawa, Hiromi*; Moriizumi, Jun*; Hirao, Shigekazu*; Iida, Takao*

Measurements of $$^{222}$$Rn flux from the ground and $$^{226}$$Ra content in soil were made on Hachijo-jima, which is a solitary island in the Pacific about 200 km to the south of the main island of Japan, to evaluate effect of locally exhaled $$^{222}$$Rn to the surface air concentration of $$^{222}$$Rn measured on this island. Averages of $$^{222}$$Rn flux and $$^{226}$$Ra content in dry soil were 0.88 mBq m$$^{-2}$$ s$$^{-1}$$ and 6.8 Bq kg$$^{-1}$$ at Hachijo-jima and 9.7 mBq m$$^{-2}$$ s$$^{-1}$$ and 23.2 Bq kg$$^{-1}$$ at Nagoya, respectively. The low level $$^{226}$$Ra content in soil is one of main causes for the small $$^{222}$$Rn flux at the island. With this $$^{222}$$Rn flux, the contribution of locally exhaled $$^{222}$$Rn from the island was estimated by a simple model to occur at concentration of 0.035 to 0.072 Bq m$$^{-3}$$ (relative contribution is 4 to 12%) under typical nocturnal condition. Under diurnal condition effect is lower than that of nocturnal condition. This local $$^{222}$$Rn component is negligible as compared with concentration of long-range transported $$^{222}$$Rn of 0.5 to 3 Bq m$$^{-3}$$.

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