Study on the measurements and evaluation of environmental external exposure after the nuclear accident

Sakamoto, Ryuichi; Saito, Kimiaki; Tsutsumi, Masahiro; Nagaoka, Toshi

Hoken Butsuri, 36(4), p.297 - 307, 2001/12

https://doi.org/10.5453/jhps.36.297

There are many factors which affect external exposure in contaminated area: distributions of fallout, compositions of radioactive nuclides, soil conditions, depth profile of radioactivity in soil, rain fall, snow cover, radioactive decay, shielding effects of houses and other structures, de-contamination measures, and the 'occupancy factor' which accounts for the fraction of time that inhabitants spend in different locations. In this study, several important issues concerning these factors have been investigated using field measurements and computational simulations since 1992 in the Chernobyl area. The objectives of the study were: (1) The development of a mobile survey method to collect radiation data of the contaminated area over a wide area in a short time; (2) The verification of a method to infer external doses to the population; (3) The provision of basic data used for the evaluation of external dose due to gamma ray using a Monte Carlo simulation method. (4) Characteristics of the radiation fields in contaminated area. In this report, the results were summerized.

Review of research and development in JAERI

Sudo, Yukio; Nagaoka, Toshi

Denki Hyoron, 85(2), p.60 - 68, 2000/02

no abstracts in English

Measurements of gamma dose rates in dwellings in the Tokyo metropolitan area

Saito, Kimiaki; Sakamoto, Ryuichi; Nagaoka, Toshi; Tsutsumi, Masahiro; Moriuchi, Shigeru*

Radiation Protection Dosimetry, 69(1), p.61 - 67, 1997/00

https://doi.org/10.1093/oxfordjournals.rpd.a031888

no abstracts in English

Environmental radiation survey in Chernobyl area

Nagaoka, Toshi; Saito, Kimiaki; Sakamoto, Ryuichi; Tsutsumi, Masahiro; Moriuchi, Shigeru

Hoken Butsuri, 31, p.63 - 68, 1996/00

https://doi.org/10.5453/jhps.31.63

no abstracts in English

Simplified technique for measurement and evaluation of indoor cosmic ray dose rate using a 3 dia. spherical NaI(Tl) scintillation detector

Nagaoka, Toshi; Moriuchi, Shigeru; Sakamoto, Ryuichi; Saito, Kimiaki; Tsutsumi, Masahiro

Hoken Butsuri, 30, p.9 - 14, 1995/00

https://doi.org/10.5453/jhps.30.9

no abstracts in English

Proceeding of the Second Steering Conference relating to the Agreement on the Implementation of Research at the Chernobyl Center for International Research between CHECIR and JAERI

Nagaoka, Toshi; Togawa, Orihiko; Moriuchi, Shigeru; S.I.Rybalko*; Sukhoruchkin, A. K.*; S.V.Kazakov*

JAERI-Conf 94-005, 99 Pages, 1994/11

JAERI-Conf-94-005.pdf:3.18MB

no abstracts in English

Procedure of data treatment for measurement of environmental gamma ray dose ratewith high accuracy

Nagaoka, Toshi; Moriuchi, Shigeru

Hoken Butsuri, 29, p.315 - 320, 1994/00

https://doi.org/10.5453/jhps.29.315

no abstracts in English

Experimental assessment of cosmic ray ionizing component at ground level by means of HPGe and NaI(Tl) spectrometry

J-S.Jun*; Nagaoka, Toshi; Moriuchi, Shigeru

JAERI-M 92-101, 25 Pages, 1992/07

JAERI-M-92-101.pdf:0.95MB

no abstracts in English

Radiation in human living environment

Nagaoka, Toshi

Radioisotopes, 41(1), p.57 - 58, 1992/00

no abstracts in English

A Carborne survey for the evaluation of diminution of terrestrial gamma ray due to snow cover

Sakamoto, Ryuichi; Nagaoka, Toshi; Saito, Kimiaki; Tsutsumi, Masahiro; Moriuchi, Shigeru

JAERI-M 91-166, 67 Pages, 1991/10

JAERI-M-91-166.pdf:2.13MB

no abstracts in English