R&D of digital technology on inverse estimation of radioactive source distributions and related source countermeasures; R&D status of digital platform including 3D-ADRES-indoor

Machida, Masahiko; Yamada, Susumu; Kim, M.; Okumura, Masahiko; Miyamura, Hiroko; Shikaze, Yoshiaki; Sato, Tomoki*; Numata, Yoshiaki*; Tobita, Yasuhiro*; Yamaguchi, Takashi; et al.

RIST News, (69), p.2 - 18, 2023/09

https://www.rist.or.jp/rnews/69/69s2.pdf

The contamination of radioactive materials leaked from the reactor has resulted in numerous hot spots in the Fukushima Daiichi Nuclear Power Station (1F) building, posing obstacles to its decommissioning. In order to solve this problem, JAEA has conducted research and development of the digital technique for inverse estimation of radiation source distribution and countermeasures against the estimated source in virtual space for two years from 2021 based on the subsidy program "Project of Decommissioning and Contaminated Water Management" performed by the funds from the Ministry of Economy, Trade and Industry. In this article, we introduce the results of the project and the plan of the renewal project started in April 2023. For the former project, we report the derivative method for LASSO method considering the complex structure inside the building and the character of the source and show the result of the inverse estimation using the method in the real reactor building. Moreover, we explain the platform software "3D-ADRES-Indoor" which integrates these achievements. Finally, we introduce the plan of the latter project.

LASSO reconstruction scheme to predict radioactive source distributions inside reactor building rooms; Practical applications

Machida, Masahiko; Shi, W.*; Yamada, Susumu; Miyamura, Hiroko; Yoshida, Toru*; Hasegawa, Yukihiro*; Okamoto, Koji; Aoki, Yuto; Ito, Rintaro; Yamaguchi, Takashi; et al.

Proceedings of Waste Management Symposia 2023 (WM2023) (Internet), 11 Pages, 2023/02

Analysis of DNA strand breaks induced by carbon ion beams in

Teranishi, Mika*; Yamaguchi, Hiroko*; Sakamoto, Ayako; Hidema, Jun*

JAEA-Review 2014-050, JAEA Takasaki Annual Report 2013, P. 115, 2015/03

https://doi.org/10.11484/jaea-review-2014-050

Radiator design for detecting high-energy neutrons with a nuclear track detector

Oda, Keiji*; Imasaka, Yuichi*; Yamauchi, Tomoya*; Nakane, Yoshihiro; Endo, Akira; Tawara, Hiroko*; Yamaguchi, Yasuhiro

Radiation Measurements, 40(2-6), p.570 - 574, 2005/11

https://doi.org/10.1016/j.radmeas.2005.04.012

no abstracts in English

Development of dose monitor and dosimeter applicable to high-energy neutron

Endo, Akira; Sato, Tatsuhiko; Satoh, Daiki; Shikaze, Yoshiaki; Tanimura, Yoshihiko; Saegusa, Jun; Tsutsumi, Masahiro; Yamaguchi, Yasuhiro; Kaneko, Hirohisa; Oda, Keiji*; et al.

no journal, , 

no abstracts in English

Analysis of DNA strand breaks induced by carbon ion beams in Arabidopsis

Teranishi, Mika*; Yamaguchi, Hiroko*; Sakamoto, Ayako; Hidema, Jun*

no journal, , 

no abstracts in English

Analysis of DNA damages induced by ion beam, ray and UVB radiation in Arabidopsis

Teranishi, Mika*; Yamaguchi, Hiroko*; Sakamoto, Ayako; Hidema, Jun*

no journal, , 

Research and development of digital technologies to explore radiation source distributions for exposure reduction; Current research and development progress

Suzuki, Masahiro; Aoki, Yuto; Yamaguchi, Takashi; Machida, Masahiko; Miyamura, Hiroko; Okamoto, Koji

no journal, , 

In order to facilitate the full-scale implementation of fuel debris removal at the Tokyo Electric Power Fukushima Daiichi Nuclear Power Plant (hereinafter referred to as 1F), it is necessary to establish a safe access route within the highly radiation-intensive reactor building (hereinafter referred to as "R/B"). For the purpose of the establishment, it requires environmental improvements such as decontamination of highly-intensive radiation sources and shielding measures. Based on the radiation dose measurement data at the site, Japan Atomic Energy Agency (JAEA) has examined inverse estimation scheme of highly-intensive radiation sources and developed a system that incorporates not only virtual reality (VR) but also mixed reality (MR, AR) to evaluate the effectiveness of decontamination and shielding measures. This report presents an overview of the research and development achievements to date and introduces necessary efforts for enhancing functionality to ensure practical applications at 1F.

Portable gamma-ray detectors

Takahashi, Tone; Koizumi, Mitsuo; Mochimaru, Takanori*; Yamaguchi, Ikuto*; Yoshimi, Yuki*; Yamanishi, Hirokuni*; Wakabayashi, Genichiro*; Tanigaki, Minoru*; Harada, Hiroshi*; Masaki, Hiroko*; et al.

no journal, , 

no abstracts in English