MEASUREMENT OF RADON/THORON EXHALATION RATES AND GAMMA-RAY DOSE RATE IN GRANITE AREAS IN JAPAN

被引：6

作者：

Prasad, G. ^{[1
]}

Ishikawa, T. ^{[1
]}

Hosoda, M. ^{[2
]}

Sahoo, S. K. ^{[1
]}

Kavasi, N. ^{[1
]}

Sorimachi, A. ^{[2
]}

Tokonami, S. ^{[2
]}

Uchida, S. ^{[1
]}

机构：

[1] Natl Inst Radiol Sci, Inage Ku, Chiba 2638555, Japan

[2] Hirosaki Univ, Hirosaki, Aomori 0368564, Japan

来源：

RADIATION PROTECTION DOSIMETRY | 2012年 / 152卷 / 1-3期

关键词：

RADON;

D O I：

10.1093/rpd/ncs206

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Radon and thoron exhalation rates and gamma-ray dose rate in different places in Hiroshima Prefecture were measured. Exhalation rates were measured using an accumulation chamber method. The radon exhalation rate was found to vary from 3 to 37 mBq m(-2) s(-1), while the thoron exhalation rate ranged from 40 to 3330 mBq m(-2) s(-1). The highest radon exhalation rate (37 mBq m(-2) s(-1)) and gamma-ray dose rate (92 nGy h(-1)) were found in the same city (Kure City). In Kure City, indoor radon and thoron concentrations were previously measured at nine selected houses using a radon-thoron discriminative detector (Raduet). The indoor radon concentrations varied from 16 to 78 Bq m(-3), which was higher than the average value in Japan (15.5 Bq m(-3)). The indoor thoron concentration ranged from ND (not detected: below a detection limit of approximately 10 Bq m(-3)) to 314 Bq m(-3). The results suggest that radon exhalation rate from the ground is an influential factor for indoor radon concentration.

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页码：130 / 134

页数：5

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