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Radiation Protection Dosimetry Advance Access published online on June 26, 2007
Radiation Protection Dosimetry, doi:10.1093/rpd/ncm221
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

THE STUDY OF ACTIVITY MEDIAN AERODYNAMIC DIAMETER USING IMAGING PLATE TECHNIQUE FOR ASSESSMENT OF EFFECTIVE DOSE FROM RADON AND ITS DECAY PRODUCTS

Naureen Mahbub Rahman1,*, Takao Iida1, Hiromi Yamazawa1, Shintaro Yokoyama2, Jun Moriizumi1, Fumihiro Saito3 and Tomonori Ito2

1 Department of Energy Engineering and Science, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603 Japan
2 Department of Urban and Environment Engineering, Graduate School of Engineering, Hokkaido University, N13, W8, Kita-ku, Sapporo 060-8628, Japan
3 Facility Radiation Control Section, Radiation Protection Department, Nuclear Science Research Institute, Tokai Research and Development Center, Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan

* Corresponding author: urmirahman244{at}yahoo.com, naureen{at}nucl.nagoya-u.ac.jp

Received October 11, 2006, amended March 1, 2007, accepted March 5, 2007

The indoor workplace environment was evaluated for exposure to radon and its decay products at two Universities in two metropolises of Japan. The mean radon concentrations in Nagoya University (NU) and Hokkaido University (HU) were 16.7 Bq m–3 and 18.0 Bq m–3, respectively. Activity median aerodynamic diameter (AMAD) of particles at NU ranged from 172 nm ~ 205 nm and at HU from 186 nm ~ 300 nm. Estimated effective doses for five usual sites of NU by ICRP approach was 0.15 mSvy–1 ~ 0.76 mSvy–1 and by UNSCEAR approach was 0.05 mSvy–1 ~ 0.24 mSvy–1. The effective dose for the same of HU by ICRP 66 approach was 0.16 mSvy–1 ~ 0.79 mSvy–1 and by UNSCEAR 2000 approach was 0.05 mSv y–1 to 0.26 mSv y–1. The two approaches differs on an average by a factor 2.3– ~ 4.7. The AMAD of obtained particle size distribution at NU has an average total deposition of 23% in human respiratory tract and 20% at HU.


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