Measurement system for alpha and beta emitters with continuous air sampling under different exposure situations

Ryohei Yamada; Yuki Tamakuma; Kazuki Iwaoka; Masahiro Hosoda; Yoshitaka Shiroma; Naofumi Akata; Hiroyuki Mizuno; Kouji Yamada; Tomohiro Kuroki; Shinji Tokonami

doi:10.1016/j.apradiso.2017.01.002

Measurement system for alpha and beta emitters with continuous air sampling under different exposure situations

Appl Radiat Isot. 2017 Aug:126:79-82. doi: 10.1016/j.apradiso.2017.01.002. Epub 2017 Jan 14.

Authors

Affiliations

¹ Hirosaki University Graduate School of Health Sciences, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan.
² School of Health Sciences, Hirosaki University, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan.
³ Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan.
⁴ National Institute for Fusion Science, 322-6 Oroshicho, Toki, Gifu 509-5292, Japan.
⁵ Fuji Electric Co., Ltd., Gate City Ohsaki, East Tower 11-2, Osaki 1-chome, Shinagawa-ku, Tokyo 141-0032, Japan.
⁶ Hirosaki University Graduate School of Health Sciences, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan; Institute of Radiation Emergency Medicine, Hirosaki University, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan. Electronic address: tokonami@hirosaki-u.ac.jp.

PMID: 28111091
DOI: 10.1016/j.apradiso.2017.01.002

Abstract

In the present study, a continuous radioactive aerosol measurement system (CRAMS) was developed for measurements of radioactive plume (e.g. ¹³¹I, ¹³⁴Cs and ¹³⁷Cs) under the emergency situation, and measurements of radon/thoron progeny under the existing situation. As a result, it is suggested that the CRAMS could follow the variation of radon concentration, and the detection limit of the CRAMS under ambient dose equivalent rate of 20µSvh^-1, where the temporary evacuation is required within one week in the Japanese regulation, was evaluated to be 129Bqm^-3 in the manner of ISO11929.

Keywords: Continuous air sampling; Detection limit; Emergency and existing situation; Radioactive plume.