Planning and implementation of environmental radiation monitoring

Takeishi, Minoru

JAEA-Review 2020-077, 388 Pages, 2021/05

JAEA-Review-2020-077.pdf:18.48MB

Japan Atomic Energy Agency (JAEA) have implemented environmental radiation monitoring since 1960s around different kinds of nuclear facilities such as research reactors, MOX fuel fabrication development facilities and the first spent fuel reprocessing facility for commercial NPPs and so on. I summarize the environmental monitoring methodology from planning to evaluation comprehensively as a guide book based on our experience and referring to the latest information. This guide book contained various basic knowledge about history of environmental radiation surveillances, techniques of radiation measurement and analysis of environmental samples such as airborne materials, precipitation, fallout, soil, sediment in river and lake, drinking water, terrestrial water, vegetables, milk, pasture, sea water, seabed sediment, marine product, index samples, and including with related to fundamental knowledges like an exposure evaluation for the public and quality assurance(QA), and some regulations. In particular, I include the emergency environmental radiation monitoring with response to the accident of Chernobyl Nuclear Power Plant and Tokyo Electric Power Company Fukushima Daiichi Nuclear Power Station. Finally, I note some topics on the environmental impact study that I have experienced.

Preliminary study on determination of surface contamination density on soil in heavily contaminated areas using a CeBr scintillation detector coupled with lead shielding

Kowatari, Munehiko; Tanimura, Yoshihiko

JPS Conference Proceedings (Internet), 24, p.011037_1 - 011037_7, 2019/01

https://doi.org/10.7566/JPSCP.24.011037

Effects of muon interactions with matter on terrestrial muon-induced soft errors

Abe, Shinichiro; Sato, Tatsuhiko; Matsuba, Hirotaka*; Watanabe, Yukinobu*

Proceedings of 11th International Workshop on Radiation Effects on Semiconductor Devices for Space Applications (RASEDA-11) (Internet), p.45 - 48, 2015/11

Secondary cosmic-rays have been recognized as a cause of soft errors for microelectronics in terrestrial environment. Recently, the contribution of terrestrial muons to soft errors is concerned for advanced microelectronics because it becomes small and sensitive to radiation. Muons generate energetic secondary through photonuclear interaction and negative muon capture. In the present work, we investigate the effect of these interactions on terrestrial muon-induced soft errors. The analysis of soft error rate (SER) in the 25-nm design rule NMOSFET is performed based on the multiple sensitive volume (MSV) model using PHITS. It is clarified that the terrestrial muon-induced SER is a few or less of neutron-induced SER and it is mainly caused though negative muon capture while the effect of muon photonuclear interaction is small. It is also found that direct ionization only affects soft errors with extremely low critical charge.

Annual report on the present state and activities of the Radiation Protection Department, Nuclear Fuel Cycle Engineering Laboratories in fiscal 2009

Radiation Protection Department

JAEA-Review 2015-003, 187 Pages, 2015/03

JAEA-Review-2015-003.pdf:18.34MB

This annual report summarizes the various activities on radiation control at the nuclear fuel cycle facilities in Nuclear Fuel Cycle Engineering Laboratories, which were undertaken by the Radiation Protection Department in fiscal 2009. In the Laboratories, the Tokai Reprocessing Plant (TRP), MOX fuel fabrication facilities, the Chemical Processing Facility (CPF), and various other radioisotopes and uranium research laboratories have been operated. The Radiation Protection Department is responsible for the radiation control in and around the facilities, including personnel monitoring, workplace monitoring, consultation on radiological work planning and evaluation, monitoring of gaseous and liquid waste effluents, environmental monitoring, radiological standards, maintenance of radiation monitoring instruments, quality management, and the related research. In fiscal 2009, the results of radiological monitoring showed the situation to be normal, and no radiological incident or accident occurred. The maximum annual effective dose to radiation workers was 9.7 mSv and the mean annual effective dose was 0.2 mSv. Individual doses were kept within the annual dose limit specified in the safety regulations. The estimated effective dose caused by gaseous and liquid effluents from the TRP to imaginary members of the public around the Laboratories was 1.810 mSv. The environmental monitoring and effluent control were performed appropriately in compliance with safety regulation and standards. As for the quality management activities, the inspection by the government, the internal audit, and the maintenance to revise the documents have been continued in accordance with the quality management system which had been introduced to safety regulation since fiscal 2004.

Environmental radiation dose information system used by cellular phones in JAERI

Tachibana, Haruo; Yamaguchi, Takenori; Matsuoka, Shungo*; Nemoto, Shintaro*; Kurosawa, Naohiro*

Proceedings of 1st Asian and Oceanic Congress for Radiation Protection (AOCRP-1) (CD-ROM), 7 Pages, 2002/10

An environmental radiation monitoring system in Tokai establishment of JAERI is composed of 14 monitoring posts, 4 monitoring stations, 2 drainage monitors and the monitoring data observation center. These monitoring posts and stations measure the gamma dose rate, and the monitoring stations measure the radioactive air concentration too. Drainage monitors measure the radioactive concentration in drain water. We developed the environmental radiation dose information system used by cellular phone for observing the monitoring data in day and night, working day and holiday at everyplace in Japan. This information system shows us the every minute or every 10 minutes monitoring data table and data trend graph on the cellular phone display. In the emergency situation, this system helps for speedy response such as the notification to the JAERI staffs, starting the emergency environmental monitoring activities, reporting the dose rate and concentration to the national and local authorities, and establishment of the emergency response team in JAERI.

3rd Summer School on Environmental Radioactivity and Radiation

Hanzawa, Yukiko

Nihon Genshiryoku Gakkai-Shi, 43(11), P. 70, 2001/11

no abstracts in English

Annual report on the environmental radiation monitoring around Tokai reprocessing plant FY 1999

; Shinohara, Kunihiko; ; ; ; Takeyasu, Masanori;

JNC TN8440 2000-007, 141 Pages, 2000/06

JNC-TN8440-2000-007.pdf:3.02MB

Environmental radiation monitoring around the Tokai Reprocessing Plant has been performed since 1975, based on "Safety Regulations for the Tokai Reprocessing Plant, Chapter IV - Environmental Monitoring". This annual report presents the results of the environmental monitoring and the dose estimation to the hypothetical inhabitants due to the radioactivity discharged from the plant during April 1999 to March 2000. Appendices present comprehensive information, such as monitoring program, monitoring results, meteorological data and annual discharges from the plant.

None

JNC TN1400 2000-001, 371 Pages, 2000/01

JNC-TN1400-2000-001.pdf:12.26MB

no abstracts in English

None

PNC TN1410 97-045, 24 Pages, 1997/12

PNC-TN1410-97-045.pdf:8.07MB

no abstracts in English

None

PNC TN1410 96-057, 56 Pages, 1996/10

PNC-TN1410-96-057.pdf:1.66MB

no abstracts in English