Energy of the Th nuclear clock isomer determined by absolute -ray energy difference

Yamaguchi, Atsushi*; Muramatsu, Haruka*; Hayashi, Tasuku*; Yuasa, Naoki*; Nakamura, Keisuke; Takimoto, Misaki; Haba, Hiromitsu*; Konashi, Kenji*; Watanabe, Makoto*; Kikunaga, Hidetoshi*; et al.

Physical Review Letters, 123(22), p.222501_1 - 222501_6, 2019/11

https://doi.org/10.1103/PhysRevLett.123.222501

Study of method of measurement of the -ray 3mm dose equivalent and protection measures of the lens of eyes, 2; TL dosimeter

Yamazaki, Takumi; Takimoto, Misaki; Suga, Takumi; Hoshi, Katsuya; Yoshida, Tadayoshi; Takada, Chie; Tsujimura, Norio; Okada, Kazuhiko; Ishikawa, Hisashi

no journal, , 

no abstracts in English

Investigation of electronic personal dosemeters response in the -ray field with low dose rate

Kojima, Naomi; Nakagawa, Takahiro; Yamazaki, Takumi; Takimoto, Misaki; Takada, Chie

no journal, , 

In late years, Electronic Personal Dosemeter (EPD) has been widely used because of its useful specifications: indicating measurement values on site, lower detect limits than glass badge. However, an investigation of its response characteristic is difficult to perform using actual low dose rate -ray. The investigation needs sheildings of a entire irradiation room for reducing natural radiation. In this study, at the compact irradiation system with low dose rate which National Institute of Advanced Industrial Science and technology developed, -ray of Cs below 0.1Sv/h were irradiated to two models of EPD with recording function. Integrated dose and standard deviation for EPD were analyzed to investigate response characteristics for low dose rate radiation.

Contamination at Plutonium Fuel Research Facility of Oarai Research and Development Center, 2; Estimation of effects by body surface contamination on lung monitoring

Takimoto, Misaki; Yamazaki, Takumi; Takada, Chie; Okada, Kazuhiko; Endo, Akira; Yoshizawa, Michio; Momose, Takumaro

no journal, , 

no abstracts in English

A Spectroscopic study fo Th-229 isomer using X-ray microcalorimeter

Muramatsu, Haruka*; Yuasa, Naoki*; Hayashi, Tasuku*; Konno, Ryohei*; Yamaguchi, Atsushi*; Mitsuda, Kazuhisa*; Yamasaki, Noriko*; Kikunaga, Hidetoshi*; Nakamura, Keisuke; Takimoto, Misaki; et al.

no journal, , 

no abstracts in English

Current issues in radiation protection in Nuclear Fuel Cycle Engineering Laboratories; Next personal dosimeter and eye lens dosimetry

Uchida, Masahiro; Maeda, Tsuyoshi; Takimoto, Misaki; Takada, Chie; Tsujimura, Norio

no journal, , 

no abstracts in English

Challenge to improve the Th isomer energy measurement with TES calorimeters

Tanaka, Keita*; Hirano, Kosuke*; Yamaguchi, Atsushi*; Muramatsu, Haruka*; Hayashi, Tasuku*; Yuasa, Naoki*; Nakamura, Keisuke; Takimoto, Misaki; Haba, Hiromitsu*; Shirasaki, Kenji*; et al.

no journal, , 

Internal radioactivity measurements of workers at Fukushima Dai-ichi Nuclear Power Plant

Kanai, Katsuta; Kurihara, Osamu*; Takada, Chie; Nakagawa, Takahiro; Morishita, Yuki; Hokama, Tomonori; Takimoto, Misaki; Maruo, Yoshihiro; Momose, Takumaro

no journal, , 

no abstracts in English

The Dose-reduction activity of the lens of the eye at Tokai Reprocessing Plant

Nishino, Saki; Nemoto, Ryo*; Hayashi, Hiroyuki*; Kobayashi, Daisuke; Isomae, Hidemi; Sakuma, Shuhei; Takimoto, Misaki; Okuyama, Shun; Unno, Motoyoshi; Kitao, Takahiko

no journal, , 

At the JAEA Tokai Reprocessing facility, especially workers engaged in Plutonium Conversion Development Facility (PCDF) are required strict radiation control due to working environment handling various nuclear material including plutonium (Pu) at short range. Because the equivalent dose limit of the lens of the eye stipulated by Japanese regulations has been revised downwards, we reassessed personal dose equivalent focusing on the lens of the worker's eye. The reassessment results indicate that wearing the appropriate radiation protection glasses is necessary for some workers who handle Pu including waste material in PCDF. Radiation management using protective glasses has started under revised radiation control plan.