CHARACTERISTICS OF RADON AND THORON EXHALATION RATES IN OKINAWA, SUBTROPICAL REGION OF JAPAN

被引：5

作者：

Shiroma, Y. ^{[1
]}

Kina, S. ^{[1
]}

Fujitani, T. ^{[1
]}

Hosoda, M. ^{[2
]}

Sorimachi, A. ^{[3
]}

Ishikawa, T. ^{[4
]}

Sahoo, S. K. ^{[4
]}

Tokonami, S. ^{[3
]}

Furukawa, M. ^{[1
]}

机构：

[1] Univ Ryukyus, Grad Sch Engn & Sci, Nishihara, Okinawa 9030213, Japan

[2] Hirosaki Univ, Grad Sch Hlth Sci, Hirosaki, Aomori 0368564, Japan

[3] Hirosaki Univ, Inst Radiat Emergency Med, Hirosaki, Aomori 0368564, Japan

[4] Natl Inst Radiol Sci, Res Ctr Radiat Protect, Inage Ku, Chiba 2638555, Japan

来源：

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

关键词：

SOIL;

D O I：

10.1093/rpd/ncs220

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 from the ground surface were estimated in three islands of Okinawa Prefecture, a subtropical region of Japan. In situ measurements of the exhalation rates were conducted at a total of 88 points using an accumulation technique with a ZnS(Ag) scintillation detector. The radon and thoron exhalation rates were calculated to be 1-137 (arithmetic mean: 21) mBq m-(2) s(-1) and 32-6244 (1801) mBq m(-2) s(-1), respectively. In the surface soil samples collected at 53 measurement points, U-238 and Th-232 series concentrations were estimated to be 17.9-254.0 (64.0) Bq kg(-1) dry and 17.8-136.1 (58.8) Bq kg(-1) dry, respectively. The maximum rates and concentrations were observed in the dark red soil area. Recent studies strongly suggest that the base material of the soils may be the eolian dust derived from the southeastern part of China, a high background radiation area. The eolian dust is, therefore, considered to be an enhancer for the radon and thoron exhalations in Okinawa.

引用

页码：184 / 188

页数：5

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