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Journal Articles

When was the maximum observation of nuclear weapon fallout?

Tsujimura, Norio

Isotope News, (768), p.38 - 39, 2020/04

no abstracts in English

Journal Articles

Temporal change in concentration of radiocesium in Fukushima river water

Nakanishi, Takahiro

Isotope News, (765), p.22 - 25, 2019/10

Temporal change in concentration of radiocesium in Fukushima river water are outlined. Radiocesium concentration in river water keeps decreasing after several years, however, the declining trend for the dissolved radiocesium concentration is gradually decreasing with time.

Journal Articles

Research and development behind a computation system for 3D distributions of air dose rates in the environment; Estimating environmental radiation doses using PHITS together with remote sensing data

Kim, M.; Malins, A.; Sakuma, Kazuyuki; Kitamura, Akihiro; Machida, Masahiko; Hasegawa, Yukihiro*; Yanagi, Hideaki*

Isotope News, (765), p.30 - 33, 2019/10

Here we outline a system for generating three dimensional models of urban and rural areas in Fukushima Prefecture. The $$^{134}$$Cs and $$^{137}$$Cs radioactivity distribution can be set flexibly across the different components of the model. The models incorporate realistic representations of local buildings, individual conifer and broadleaf trees, and the topography of the land surface. The system is demonstrated by modelling a suburban area 4 km from the Fukushima Daiichi Nuclear Power Plant that has yet to be decontaminated. Air dose rates calculated in PHITS were correlated with measurements taken across the site in a car-borne survey.

Journal Articles

Detection of alpha emitters originating from Fukushima Daiichi Power Station using an alpha imaging detector

Morishita, Yuki; Usami, Hiroshi; Torii, Tatsuo

Isotope News, (765), p.10 - 13, 2019/10

This paper reports the development of an alpha particle imaging detector to detect alpha emitters originating from the Fukushima Daiichi Nuclear Power Station and the actual measurement of smear papers.

Journal Articles

U-Pb dating of calcium carbonate using LA-ICP-MS

Yokoyama, Tatsunori

Isotope News, (764), p.11 - 14, 2019/08

no abstracts in English

Journal Articles

Gross beta radioactivity measurement method and nuclear fallout

Tsujimura, Norio

Isotope News, (763), p.42 - 43, 2019/06

no abstracts in English

Journal Articles

Present status and future prospect of high energy nuclear data used for radiation therapy

Iwamoto, Osamu; Kunieda, Satoshi; Iwamoto, Nobuyuki

Isotope News, (763), p.4 - 7, 2019/06

no abstracts in English

Journal Articles

Estimation of the therapeutic effect of BNCT based on the dose distributions in cellular scale

Sato, Tatsuhiko

Isotope News, (760), p.2 - 5, 2018/12

Recently, we proposed a new model for estimating the biological effectiveness for Boron Neutron Capture Therapy (BNCT) based on the absorbed dose distributions in cellular scale. The model quantitatively highlighted the indispensable need to consider the synergetic effect and the dose dependence of the biological effectiveness in the estimate of the therapeutic effect of BNCT. This paper reviews the basic features of the model.

Journal Articles

Development of novel alumina adsorbent applying mesoporous process

Fukumitsu, Nobuyoshi*; Yamauchi, Yusuke*; Saptiama, I.*; Ariga, Katsuhiko*; Hatano, Kentaro*; Kumada, Hiroaki*; Fujita, Yoshitaka; Tsuchiya, Kunihiko

Isotope News, (760), p.15 - 18, 2018/12

no abstracts in English

Journal Articles

Estimation of radionuclide deposition process by cloud and fog water at mountainous area; Comparison of observed data of airborne radiation monitoring and reproduction calculation

Sanada, Yukihisa; Katata, Genki*; Kaneyasu, Naoki*

Isotope News, (759), p.18 - 21, 2018/10

no abstracts in English

Journal Articles

A Three-dimensional imaging technique for radioactive contamination

Sato, Yuki; Torii, Tatsuo

Isotope News, (757), p.44 - 47, 2018/06

no abstracts in English

Journal Articles

Journal Articles

Nihonium, and the next elements...

Sakurai, Hiroshi*; Shinohara, Atsushi*; Koura, Hiroyuki; Kamigaito, Osamu*; Morimoto, Koji*; Haba, Hiromitsu*; Enyo, Hideto*

Isotope News, (特別号2), p.2 - 14, 2018/01

no abstracts in English

Journal Articles

How do cosmic-ray dose rates of public vary with nations?

Sato, Tatsuhiko

Isotope News, (752), p.50 - 53, 2017/08

After the release of the Report of the United Nations Scientific Committee of the Effects of Atomic Radiation in 2008 (UNSCEAR2008), it became commonly accepted that the world population-weighted effective dose due to cosmic-ray exposure is 0.38 mSv. However, this value was derived from approximate projections of altitude and geographic dependences of the cosmic-ray dose rates as well as the world population. We therefore re-evaluated the population-weighted annual effective doses and their probability densities for the entire world as well as for 230 individual nations, using a sophisticated cosmic-ray flux calculation model in tandem with detailed grid population and elevation databases. Outline and results of the evaluation are presented in this manuscript.

Journal Articles

Evaluation of nuclear data for application of isotopes

Iimura, Hideki

Isotope News, (746), p.39 - 42, 2016/08

Various nuclear data tables are available for radioisotopes users. In this article properties of these tables are compared. Also, it is explained how the recommended values in these tables are determined from f large amount of experimental data.

Journal Articles

Recent progress of the energy-resolved neutron imaging system at J-PARC

Kai, Tetsuya; Shinohara, Takenao

Isotope News, (746), p.20 - 24, 2016/08

no abstracts in English

Journal Articles

Summary of ICRP Symposium on Radiological Protection Dosimetry

Endo, Akira; Hamada, Nobuyuki*

Isotope News, (745), p.42 - 43, 2016/06

ICRP Symposium on Radiological Protection Dosimetry was held in Hongo campus, the University of Tokyo on February 18, 2016. Committee 2 of the International Commission on Radiological Protection (ICRP) is engaged in the development of dose coefficients for the assessment of internal and external radiation exposures; development of reference biokinetic and dosimetric models, and reference data for workers and members of the public. The symposium aimed at reviewing the current work of ICRP and discussing research needed for the ICRP System of radiological protection dosimetry. This article reviews the presentations and discussion in the symposium.

Journal Articles

Development of fuel debris removal techniques with lasers

Daido, Hiroyuki

Isotope News, (743), p.7 - 11, 2016/03

no abstracts in English

Journal Articles

Development of $$^{99}$$Mo/$$^{99m}$$Tc generator for the $$^{99}$$Mo/$$^{99m}$$Tc domestic production

Fukumitsu, Nobuyoshi*; Tsuchiya, Kunihiko; Ariga, Katsuhiko*; Yamauchi, Yusuke*

Isotope News, (742), p.20 - 24, 2016/02

no abstracts in English

159 (Records 1-20 displayed on this page)