@article{oai:repo.qst.go.jp:00046489,
 author = {Kurihara, Osamu and Kanai, Katsuta and Nakagawa, Takahiro and Takada, Chie and Tsujimura, Norio and Momose, Takumaro and Furuta, Sadaaki and 栗原 治},
 issue = {2},
 journal = {Journal of Nuclear Science and Technology},
 month = {Feb},
 note = {The Great East Japan Earthquake Disaster on 11 March 2011 caused an unprecedented accident at the
Fukushima Daiichi nuclear power station operated by Tokyo Electric Power Company (TEPCO).
Nuclear Fuel Cycle Engineering Laboratories of Japan Atomic Energy Agency performed internal dose
measurements of 560 employees involved in the accident during the period from 20 April to 5 August in
2011 at the request of TEPCO. The present paper describes our measurements of 131I in the thyroid that
is the predominant contributor to the internal dose. These measurements were carried out using an
HPGe detector installed in a low-background shielded chamber made of 20-cm-thick steel and the
detector was placed adjacent to the subject's neck. The typical minimum detectable activity of this
technique was 10 Bq for a counting time of 10 min; however, this sensitivity made it difficult to identify a
residual thyroid content of 131I corresponding to a committed effective dose of 20 mSv for late subjects.
This paper discussed technical issues experienced through the measurements such as the influence of 131I
in the rest of the body, the calibration phantom of use, and so on.},
 pages = {122--129},
 title = {Measurements of 131I in the thyroids of employees involved in the Fukushima Daiichi nuclear power station accident},
 volume = {50},
 year = {2013}
}