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Journal Articles

Detailed deposition density maps constructed by large-scale soil sampling for $$gamma$$-ray emitting radioactive nuclides from the Fukushima Dai-ichi Nuclear Power Plant accident

Saito, Kimiaki; Tanihata, Isao*; Fujiwara, Mamoru; Saito, Takashi*; Shimoura, Susumu*; Otsuka, Takaharu*; Onda, Yuichi*; Hoshi, Masaharu*; Ikeuchi, Yoshihiro*; Takahashi, Fumiaki; et al.

Journal of Environmental Radioactivity, 139, p.308 - 319, 2015/01

 Times Cited Count:191 Percentile:99.23(Environmental Sciences)

Journal Articles

Measurement of air dose rates over a wide area around the Fukushima Dai-ichi Nuclear Power Plant through a series of car-borne surveys

Ando, Masaki; Nakahara, Yukio; Tsuda, Shuichi; Yoshida, Tadayoshi; Matsuda, Norihiro; Takahashi, Fumiaki; Mikami, Satoshi; Kinouchi, Nobuyuki; Sato, Tetsuro*; Tanigaki, Minoru*; et al.

Journal of Environmental Radioactivity, 139, p.266 - 280, 2015/01

 Times Cited Count:43 Percentile:86.58(Environmental Sciences)

A series of car-borne surveys using the KURAMA and KURAMA-II systems was conducted in a wide area in eastern Japan from June 2011 to December 2012 to evaluate the distribution of air dose rates around the Fukushima Dai-ichi Nuclear Power Plant, and to determine the time-dependent trend of decrease in air dose rates. An automated data processing system was established, which enables analyses of large amounts of data obtained with the use of about 100 units of the measurement system in a short time. The initial data for studying the migration status of radioactive cesium was obtained in the first survey, followed by the other car-borne surveys having wider measurement ranges. Comparing the measured air dose rates obtained in each survey, it was found that the decreasing trend of air dose rates measured through car-borne surveys was larger than that expected from the physical decay of radioactive cesium and that measured using NaI (Tl) survey meters around the road.

Journal Articles

Activities towards environmental restoration by JAEA Fukushima Environmental Safety Center

Kinouchi, Nobuyuki

Hoshasen To Sangyo, (135), p.39 - 42, 2013/12

no abstracts in English

JAEA Reports

Renewal of centralized radioactivity measurement system for radiation control

Kawasaki, Katsuya; Mochizuki, Kaoru*; Suzuki, Takehiko; Kinouchi, Nobuyuki

JAERI-Tech 2004-070, 50 Pages, 2004/12

JAERI-Tech-2004-070.pdf:18.19MB

The centralized radioactivity measurement system has been used to carry out intensively measurements of a large number and variety of samples that are necessary for the control of radioactivity in the facilities of the JAERI Tokai Establishment and its environment. The operation of the system started in 1981, and presently the system processes more than 20,000 samples a year. However, the computers of the system have aged so much that the manufacturer's support and stable operation are no longer sure. Therefore, we renewed and restructured the computer system in 2003. A client-server system was adopted in the new system. The information of samples can be registered through the intranet. The clients can also confirm the progress of processing of their samples and browse the analytical results from their own computers. The renewed system can provide some convenience functions to the clients.

Journal Articles

Design of an anti-compton spectrometer for low-level radioactive wastes using Monte Carlo techniques

Tsutsumi, Masahiro; Oishi, Tetsuya; Kinouchi, Nobuyuki; Sakamoto, Ryuichi; Yoshida, Makoto

Journal of Nuclear Science and Technology, 39(9), p.957 - 963, 2002/09

 Times Cited Count:3 Percentile:24.34(Nuclear Science & Technology)

An anti-Compton spectrometer with semi-2$$pi$$ Compton suppression is designed to identify the photons emitted from low-level radioactive wastes from radioisotope usage and nuclear research laboratory. Since the objective sample is massive and large, the system has a full opening towards the sample position. The characteristics and features of the system concerning Compton suppression and reduction of the background component due to natural radioactive source are estimated by the Monte Carlo simulations. The anti-Compton technique is shown to be quite advantageous for the reduction of the surrounding natural background radiation, as well as the suppression of the background for the higher energy photons.

Journal Articles

A Simple method evaluating collection performance of air filters with imaging plates

Kinouchi, Nobuyuki; Oishi, Tetsuya; Yoshida, Makoto

Radioisotopes, 51(7), p.266 - 271, 2002/07

Collection performance such as collection efficiency and surface colletion efficiency is considerably important in order to select a suitable filter for the measurement of the concentrations of airborne radioactive particles. A simple method with imaging plates is proposed to evaluate the collection performance of air filters. By comparing the collection performance of some filters with natural airborne radioactivity as a test aerosol, it was confirmed that the method could reliably evaluate the collection performance of filters.

Journal Articles

Development of a plutonium air monitor for emergency environmental monitoring

Kinouchi, Nobuyuki; Oishi, Tetsuya; Noguchi, Hiroshi; Yoshida, Makoto; Kato, Shohei; Ito, Katsuhito*

Radioisotopes, 51(2), p.71 - 77, 2002/02

We have developed an air monitor which is possible to measure rapidly and sensitively the concentration of plutonium for the environmental monitoring at an accident of a nuclear reprocessing plant. The monitor is designed to collect airborne plutonium by drawing the ambient air through a filter and to detect the activity by alpha spectroscopy. The following two methods are equipped with the monitor: continuous measurement at atomospheric pressure and batch measurement at vacuum. The description of the air monitor and the results of performance test are reported.

Journal Articles

Simulation of the background for $$gamma$$ detection system in the indoor environments of concrete buildings

Tsutsumi, Masahiro; Oishi, Tetsuya; Kinouchi, Nobuyuki; Sakamoto, Ryuichi; Yoshida, Makoto

Journal of Nuclear Science and Technology, 38(12), p.1109 - 1114, 2001/12

In order to predict the indoor background spectra to gamma detection systems, the gamma radiation field in a concrete building is studied by the Monte Carlo simulations. The parameters of wall thickness, room shape and dimensions were considered in the modeling. The indoor source geometry was simulated by a spherical layer model with the intention of easy and effective calculations. The model was applied to an unshielded germanium detector and the detection system with a more complex shielding configuration. As the results, we found that the indoor radiation field in concrete buildings can be predicted well with the source geometry of a spherical concrete layer of 25cm thickness and with the source of the natural major three components of the $$^{238}$$U series, $$^{232}$$Th series and $$^{40}$$K that are homogeneously distributed. The simulation model is useful for designing and optimizing gamma detection systems or shielding assemblies.

Journal Articles

Selection of filter media used for monitoring airbone alpha-emitting particles in a radiological emergency

Kinouchi, Nobuyuki; Oishi, Tetsuya; Noguchi, Hiroshi; Kato, Shohei; Ishizawa, Masato*

Radioisotopes, 50(9), p.403 - 407, 2001/09

no abstracts in English

Journal Articles

Uniformity of beta-ray plane sources for the calibration of surface contamination monitors

Kinouchi, Nobuyuki; Oishi, Tetsuya; Yoshida, Makoto

Radioisotopes, 50(5), p.183 - 189, 2001/05

no abstracts in English

Journal Articles

Deposition of tritiated water vapour to water surface in outdoor field

Noguchi, Hiroshi; Fukutani, Satoshi*; Yokoyama, Sumi*; Kinouchi, Nobuyuki

Radiation Protection Dosimetry, 93(2), p.167 - 172, 2001/00

 Times Cited Count:7 Percentile:50.11(Environmental Sciences)

no abstracts in English

Journal Articles

Selection of filter media in alpha air monitors for emergency environmental monitoring

Kinouchi, Nobuyuki; Oishi, Tetsuya; Noguchi, Hiroshi; Kato, Shohei; Ishizawa, Masato*

Proceedings of 10th International Congress of the International Radiation Protection Association (IRPA-10) (CD-ROM), 4 Pages, 2000/05

no abstracts in English

Journal Articles

Deposition of HTO to water surface during a chronic HT release experiment

Noguchi, Hiroshi; Fukutani, Satoshi*; Yokoyama, Sumi; Kinouchi, Nobuyuki

KURRI-KR-61, p.18 - 25, 2000/00

no abstracts in English

JAEA Reports

A Database on tritium behavior in the chronic HT release experiment, 1; Meteorological data and tritium concentrations in air and soil

Noguchi, Hiroshi; Yokoyama, Sumi; Fukatani, S.*; Kinouchi, Nobuyuki; Murata, Mikio; Amano, Hikaru; Atarashi-Andoh, Mariko

JAERI-Data/Code 99-022, 125 Pages, 1999/03

JAERI-Data-Code-99-022.pdf:6.76MB

no abstracts in English

Journal Articles

Measurement of HTO permeability parameters of materials for protective appliances

Yokoyama, Sumi; Noguchi, Hiroshi; Kinouchi, Nobuyuki; Yamamoto, Hideaki; Kato, Shohei; *; *

Hoken Butsuri, 34(1), p.57 - 66, 1999/00

no abstracts in English

Journal Articles

Test of dust scattering caused by dumping of concrete materials

Kinouchi, Nobuyuki; Kato, Shohei

KURRI-KR-30, p.12 - 19, 1998/00

no abstracts in English

Journal Articles

Behavior of tritium gas released continuously to the atmosphere

Yokoyama, Sumi; Noguchi, Hiroshi; Fukatani, S.; Kinouchi, Nobuyuki; Murata, Mikio; Amano, Hikaru; Atarashi, Mariko

Int. Symp. on Nuclear Energy and the Environment (96 NEE), 0, p.102 - 104, 1996/00

no abstracts in English

Journal Articles

Tritium behavior on a cultivated plot in the 1994 chronic HT release experiment at Chalk River

Noguchi, Hiroshi; Yokoyama, Sumi; Kinouchi, Nobuyuki; Murata, Mikio; Amano, Hikaru; Atarashi, Mariko; Ichimasa, Yusuke*; Ichimasa, Michiko*

Fusion Technology, 28, p.924 - 929, 1995/10

no abstracts in English

Journal Articles

Performance of improved cellulose-glass fiber filter paper for radioactive aerosol sampling

Kinouchi, Nobuyuki; Onodera, Junichi; Yoshino, Toshiaki; Murata, Mikio; *

Hoken Butsuri, 30, p.309 - 314, 1995/00

no abstracts in English

JAEA Reports

33 (Records 1-20 displayed on this page)