Japan Health Physics Society Symposium I
Issues related to internal exposure after the Fukushima accident –Insoluble cesium-bearing
particles and short-lived radionuclides–
Ad hoc Committee on Internal Exposure Evaluations
The University of Tokyo
13:30‐17:00, Monday, 19 March 2018
Organized by Japan Health Physics Society (JHPS)
Co-organized by Japanese Society of Radiation Safety Management (JRSM)
Sponsored by Japan Society for Atmospheric Environment (JSAE), Japan Association ofAerosol Science and Technology (JAAST)
Objectives
An ad hoc Committee on Internal Exposure Evaluation has dealt with issues related to internal
exposure after the Fukushima accident, especially regarding the issues on methods for internal
dose estimation (methods for estimating internal doses from inhaled radionuclides). In
particular, we have focused on how to estimate doses due to inhalation of insolublecesium-bearing particles with high specific radioactivity (so-called Cs-ball).
The first session consisted of presentations on recent topics on insoluble cesium-bearing
particles, as well as the current status of internal exposure assessment after the Fukushima
accident. The former topics were presented by invited speakers (non-committee members).
The second session included presentations on health effects and dosimetry of inhaledinsoluble particles, as well as internal exposure due to short-lived radionuclides such astellurium. The third session was planned as discussions on all topics presented in the first andsecond sessions.
We welcomed everybody who was interested in this symposium including citizens. As aresult, more than 80 persons participated. Thank you.
Registration
Advance registration is required for the preparation of presentation materials. The registration
fees to be paid onsite are JPY 2,000 for official members of JHPS and/or JRSM, JPY 1,000for student members, and JPY 4,000 for non-members. Please send your name, affiliation, andemail address to the Secretary of Japan Health Physics Society at exec.off@jhps.or.jp by 16
March 2018.
Venue
Room number 221, Faculty of Engineering Build. 2, Hongo Campus, The University ofTokyo
Access: http://www.t.u-tokyo.ac.jp/foee/access.html
Program
13:30‐13:40	  Opening address	 
Hiroko Yoshida (Tohoku Univ, JHPS)
Session 1
Moderator: Michiaki Kai (Oita Univ of Nursing and Health Sciences)
13:40‐14：00

Current status of internal exposure assessment after the Fukushima accident

Tetsuo Ishikawa (Fukushima Medical Univ)
14：00‐14：25
14：25‐14：50

Insoluble Cesium-bearing micro particles originated from the Fukushimaaccident –Their regional distribution of detection and dispersion simulation
Yuichi Moriguchi (Univ. of Tokyo)
Re-suspended aerosols during dusting in residential houses near the FDNPP
and whole-body counter measurements of workers who dusted
Hiroko Yoshida (Tohoku Univ)

14：50‐15：00 BreakSession 2
Moderator: Tetsuo Ishikawa (Fukushima Medical Univ)
15：00‐15：25Estimation of internal dose for inhalation of insoluble particles
Kenraro Manabe (JAEA)

15：25‐15：50

15：50‐16：15

How should we consider health effects of internal exposure due to inhaledinsoluble particles?
Michiaki Kai (Oita Univ of Nursing and Health Sciences)
Internal exposure due to short-lived radionuclides
Ichiro Yamaguchi (NIPH) & Alex Malins (JAEA)

16：15‐16：25 BreakSession 3
Moderator: Michiaki Kai (Oita Univ of Nursing and Health Sciences)
16：25‐17：00 General Discussion