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Yoshitomi, Hiroshi; Futagawa, Kazuo
JAEA-Research 2024-016, 26 Pages, 2025/02
JAEA-Research-2024-016.pdf:2.0MB
In environmental radiation monitoring around nuclear facilities, dose measurements have been implemented by passive dosimetry systems using thermoluminescence dosimeters or radiophotoluminescence dosimeters. Optically stimulated luminescence (OSL) dosimeter, hereinafter called OSLD, is one of the commonly used passive dosimeter for personal dose monitoring and provides highly reliable measurements. However, it has not been utilized for environmental dose monitoring purposes. The OSLD will be a promising dosimeter, which make it possible to conduct cost-effective and reliable environmental dose measurements by utilizing existing resources, such as readers and dosimeters. When considering the application of the OSLD using aluminum oxide (
-Al
O
:C) for environmental dose monitoring, the following problems should be solved: (1) the lack of a dose calculation algorithm to evaluate air-absorbed dose from OSL signals, and (2) the conformity with JIS Z 4346:2017, which specifies the required performance of passive dosimeters for environmental monitoring, has not been evaluated. Therefore, in this study, a dose calculation algorithm was developed using Monte Carlo simulations, and tests based on JIS Z 4346:2017 were conducted. As a result, it was confirmed that the OSLD meets the performance criteria mentioned in JIS Z 4346:2017. The effective measurement range is from 0.1 mGy to 1 Gy, the range of energy and angle of incidence are from 30 keV to 1.25 MeV and from 0
to 
60, the temperature and humidity range are from -20C to 40C and from 10% to 90%, which are adequate for environmental dose monitoring.
Ohashi, Hirofumi; Inaba, Yoshitomo; Nishihara, Tetsuo; Takeda, Tetsuaki; Hayashi, Koji; Inagaki, Yoshiyuki
Nuclear Production of Hydrogen, p.177 - 185, 2006/00
Japan Atomic Energy Agency (JAEA) has been promoting R&D on the hydrogen production technology with a High Temperature Gas-cooled Reactor (HTGR). Research on the system integration technology has been carried out about four items, that is, (a) control technology to keep reactor operation against thermal disturbance caused by the hydrogen production system, (b) estimation of tritium permeation from reactor to hydrogen, (c) countermeasure against explosion and (d) development of high temperature valve to isolate reactor and hydrogen production systems in accidents. This report describes current status of research activities on the system integration technology at JAEA.
Sudo, Norimichi*; Kobayashi, Ikuo*; Murakami, Hiroyuki
Hoken Butsuri, 36(1), p.95 - 100, 2001/03
no abstracts in English
Suzuki, Akifumi*; Ito, Masashi
JAERI-Tech 2000-089, 30 Pages, 2001/02
JAERI-Tech-2000-089.pdf:1.81MB
no abstracts in English
Murakami, Hiroyuki
Isotope News, (558), p.57 - 60, 2000/11
no abstracts in English
Matsushita, Akira*; Yamamoto, Tetsuya*; Matsumura, Akira*; Shibata, Yasushi*; Nose, Tadao*; Yamamoto, Kazuyoshi; Kumada, Hiroaki; Hori, Naohiko; Torii, Yoshiya
Proceedings of 9th International Symposium on Neutron Capture Therapy for Cancer, p.203 - 204, 2000/10
no abstracts in English
Maruyama, Yu; Igarashi, Minoru*; Hashimoto, Kazuichiro; Nakamura, Naohiko*; Hidaka, Akihide; Sugimoto, Jun
Transactions of the American Nuclear Society, 75, p.273 - 274, 1996/00
no abstracts in English
Sasuga, Tsuneo; Hagiwara, Miyuki
Polymer, 27, p.821 - 826, 1986/00
Times Cited Count：52 Percentile：89.94(Polymer Science)no abstracts in English
Miyauchi, Hideaki; Yoshitomi, Hiroshi; Takahashi, Fumiaki; Tachibana, Haruo; Suzuki, Akifumi; Sato, Yoshitaka*; Kobayashi, Ikuo*
no journal, ,
In the Japan Atomic Energy Agency (JAEA), exposures to fingertips can be significant in radiological decontamination at the facilities with mixture fields of beta and 
(X) rays. The radiation doses to fingertips have been measured by ring type dosemeters equipped with thermoluminescence dosemeters (TLD) in JAEA. We applied small Optically Stimulated Luminescence (OSL) elements to the ring type dosemeter, which has the advantages in the use for long term and repeating in dose measurements comparing to the TLDs. The ring type dosemeter using OSL elements have started operating from 2012.
Igarashi, Yudai*; Udaanjargal, U.*; Kokubu, Yoko; Fujita, Natsuko; Hasegawa, Hitoshi*; Ichinnorov, N.*; Katsuta, Nagayoshi*; Davaadorj, D.*; Hasebe, Noriko*
no journal, ,
Lake Olgoy locates in the "Valley of the Gobi lakes" in southern Mongolia, on the southern slope of Khangai Mountain range. The 10.5m core was collected from Lake Olgoy in the winter of 2017. This study measured quartz OSL, feldspar IRSL and radiocarbon ages. Quartz OSL ages range in 0.60.1 ka to 10.72.5 ka, feldspar IRSL in 1.10.1 ka to 52.95.0 ka and radiocarbon ages in 1.4 ka to 48.6 ka. Based on the comparison of ages by three methods, the age-depth model of the core was proposed. Together with other analytical data from the core, glacier melting events in Khangai Mountains will be discussed.
Nanda, N.*; Usami, Hiroshi; Morishita, Yuki; Sugita, Takeshi*; Torii, Tatsuo; Yasuda, Nakahiro*
no journal, ,
Igarashi, Yudai*; Udaanjargal, U.*; Kokubu, Yoko; Watanabe, Takahiro; Hasegawa, Hitoshi*; Ichinnorov, N.*; Katsuta, Nagayoshi*; Davaadorj, D.*; Hasebe, Noriko*
no journal, ,
Lake Olgoy locates in the "Valley of the Gobi lakes" in southern Mongolia, on the southern slope of Khangai Mountain range. The 10.5 m core was collected from Lake Olgoy in the winter of 2017. This study measured quartz OSL, feldspar IRSL and radiocarbon ages. Quartz OSL ages range in 0.60.1 ka to 10.72.5 ka, feldspar IRSL in 1.10.1 ka to 52.95.0 ka and radiocarbon ages in 1.4 ka to 48.6 ka. Based on the comparison of ages by three methods, the age-depth model of the core was proposed. Together with other analytical data from the core, glacier melting events in Khangai Mountains will be discussed.
