2024-03-28T10:45:52Z
https://u-ryukyu.repo.nii.ac.jp/oai
oai:u-ryukyu.repo.nii.ac.jp:02011288
2023-08-03T05:29:11Z
1642838163960:1642838338003
1642838403551:1642838406414
Measurement of Absorbed Dose Rate in Air at NIFS Site after the First Deuterium Plasma Experiment in LHD
Shiroma, Yoshitaka
Hirao, Shigekazu
Akata, Naofumi
Furukawa, Masahide
Miyake, Hitoshi
Hayashi, Hiroshi
Saze, Takuya
Tanaka, Masahiro
open access
©2019 The Japan Society of Plasma Science and Nuclear Fusion Research
absorbed dose rate in air
environmental radiation
background measurement
deuterium plasma experiment
NIFS site
The latest measurement of the absorbed dose rate in air was performed at the National Institute for Fusion Science (NIFS) site during the period for the first deuterium plasma experiment conducted in Large Helical Device (LHD). The arithmetic mean of the absorbed dose rates in air for 222 measurement points at the NIFS site was 43 nGy h^<−1>. Very little change was observed in the distribution maps of the absorbed dose rates in air before and after the deuterium experiment in the LHD. In addition, the absorbed dose rates in air around the buildings were distributed at similar high levels before and after the deuterium experiment. A radionuclide analysis of soil and broken stone was conducted using a high-purity Ge semiconductor detector. The absorbed dose rates in air at the NIFS site were mainly defined by the radiation from the ground and the building material around the measurement points. The effect of the deuterium experiment was so small that it was undetectable in this study.
論文
The Japan Society of Plasma Science and Nuclear Fusion Research
プラズマ・核融合学会
2019-07-11
eng
journal article
VoR
http://hdl.handle.net/20.500.12000/47468
http://hdl.handle.net/20.500.12000/47468
https://u-ryukyu.repo.nii.ac.jp/records/2011288
https://doi.org/10.1585/pfr.14.1305130
https://doi.org/10.1585/pfr.14.1305130
1880-6821
Plasma and Fusion Research
14
https://u-ryukyu.repo.nii.ac.jp/record/2011288/files/14_1305130.pdf