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

https://www.jrias.or.jp/books/cat3/2019/765.html

Here we outline a system for generating three dimensional models of urban and rural areas in Fukushima Prefecture. The Cs and 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.

Remote particle counter for clean rooms

Ozu, Akira; Okamoto, Ryuta*; Kawakita, Hiroshi*

Kurin Tekunoroji, 16(3), p.56 - 61, 2006/03

In recent years, particle counting devices capable of monitoring particles suspended in air on real-time basis are of considerable practical concern in the fields of semiconductor and large display panel industries. A remote particle counter, which had been developed for monitoring aerosols released in air from nuclear facilities, has been applied to a measurement system for clean rooms used in the fields. It can visualize the particles in narrow space at a distance of 6m and derive the number and size distribution of particles with diameter of above 0.5 microns. By improving the laser energy, sensitivity of the image intensifier camera, and magnification of the zoom lens used in the system, it is possible to detect the particles with diameters of below 0.5 microns. The method and the current performance of the measurement system are described.

Regional hydrogeological study project; Results from 1992-1999 period

Koide, Kaoru; Nakano, Katsushi; Takeuchi, Shinji; Hama, Katsuhiro; ; Ikeda, Koki;

JNC TN7400 2000-014, 83 Pages, 2000/11

JNC-TN7400-2000-014.pdf:4.84MB

The Japan Nuclear Cycle Development Institute (JNC) has been conducting a wide range of geoscientific research in order to build a firm scientific and technological basis for the research and development of geological disposal. One of the major components of the ongoing geoscientific research programme is the Regional Hydrogeological Study (RHS) project in the Tono region, central Japan. The main goal of the RHS project is to develop and demonstrate surface-based investigation methodologies to characterize geological environments at a regional scale in Japan. The RHS project was initiated in 1992. The first five years of the project were devoted mainly to develop methodologies and techniques for deep borehole investigations in crystalline rock in Japan. Investigations to verify the performance of new instruments and methods for borehole drilling, hydraulic testing and groundwater sampling were conducted. In the last four years, surface-based investigations and a stepwise development of models of the geological environment have been carried out. To date, remote sensing, geological mapping, airborne and ground geophysical investigations, and measurements in eleven deep boreholes have been carried out. Hydro monitorring is continuing in these boreholes. Important results that have been obtained from these investigations include multi-disciplinaly information about the heterogeneity of lithology and hydraulic, geochemical and rock mechanical properties of the granitic rock, and evolution of the groundwater geochemistry. Technical knowledge and experience have been accumulated, which allow application of the methodologies and techniques to characterize the geological environment in crystalline rock. The results from these R%D activities were used as prime inputs for the H12 report that JNC submitted to the Japanese Government in l999. Results from such R&D is also acknowledged by other geoscientific studies in general. JNC will synthesize the results from R&D ...

Development of in-situ remote monitoring technique; Detection of iodine with the use of high repetition rate tunable laser

Maruyama, Yoichiro; Kato, Masaaki; Ozu, Akira; Bamba, Tsunetaka

JAERI-Research 99-073, p.11 - 0, 2000/01

JAERI-Research-99-073.pdf:2.1MB

no abstracts in English

The 1999 JNC International Forum on the peaceful Use of Nuclear Energy Summary

Mochiji, Toshiro; ; Tazaki, Makiko

JNC TN1200 99-002, 44 Pages, 1999/03

JNC-TN1200-99-002.pdf:3.7MB

The 1999 JNC International Forum on the Peaceful Use of Nuclear Energy the Nuclear Fuel Cycle and Nuclear Non-Proliferation Technology, a continuation of the annual International Forum on Nuclear Non-proliferation sponsored by its predecessor organization PNC (Power Reactor and Nuclear Fuel Development Corporation), was held February 22-23, 1999 in Tokyo, Japan. About 380 people from government, industry, and academia involved in nuclear technology and issues attended the forum. A distinguished group of speakers participated in the forum sessions including highly respected technology and policy experts from France, Russia, and the United States. Session themes were: (1) Advanced Nuclear Technology for Peaceful Purposes and Nuclear Non-Proliferation, (2) Transparency Improvements in Nuclear Technology through the Disposition of Excess Nuclear Weapons Plutonium. This document provides a record of speeches and discussion which have no written documentation and summarizes presented papers as appropriate. Full papers prepared by the presenters can be found in The Proceedings of the 1999 JNC International Forum on the Peaceful Use of Nuclear Energy.

Remotesensing technique using infrared thermography, 3

Okamoto, Yoshizo*; *;

Hikari Araiansu, 9(9), p.55 - 60, 1998/09

http://ci.nii.ac.jp/naid/40004881205

no abstracts in English

Remotesensing technique using infrared thermography, 1

Okamoto, Yoshizo*; *;

Hikari Araiansu, 9(5), p.35 - 40, 1998/05

http://ci.nii.ac.jp/naid/40004881155

no abstracts in English

Development of field investigation techniques for study of regional groundwater Flow; Remote sensing; Study of hydrological characteristics of subsurface using topographic and vegetational information; Part 1

Koide, Kaoru; Yanagizawa, Koichi

PNC TN7410 93-016, 42 Pages, 1993/10

PNC-TN7410-93-016.pdf:3.7MB

The purpose of this study is to develop estimation methods of hydrological characteristics of subsurface using regional data such as remote sensing data and topographical data in order to evaluate regional groundwater flow in Japan. This study consists of following three steps. The first step is to develop methods to extract the ground surface information. The second step is to quantify the relationship between the ground surface conditions and hydrological characteristics. And the final step is to develop estimation methods of hydrological characteristics of subsurface by using ground surface information. This paper describes the development of extraction methods on the ground surface information as the first step in our study. In this paper, topography and vegetation parameters were selected as the ground surface information which is considered relating to water balance which is one of hydrological characteristics. The study site was selected in the area (5km 5km) around the Tono uranium Mine, Central Japan. In order to extract topographic information, we developed a computer program to calculate direction and inclination of hill slopes using digital elevation map (DEM). The program was validated by comparing calculated results with measured slope data which were read from topographic map in the study site. We also examined grid intervals of DEM so that terrain in the study site can be represented appropriately. As a result, it was known that the grid interval of DEM should be less than 30m in the study site. We tried to classify forest types into three classes, a broad-leaved forest, conifer forest and mixed forest, using seasonal change of the normalized vegetation index (NVI) that was calculated from SPOT HRV data. Multi-temporal data (summer, autumn and winter) of SPOT were used to determine seasonal change of NVI of each forest type. As a result, it was definitely shown that each forest type has a different seasonal change of NVI. We ...

Thermal Copability of JT-60 Magnetic Limiter Plate

; Nakamura, H.

JAERI-M 83-220, 27 Pages, 1983/12

JAERI-M-83-220.pdf:0.78MB

no abstracts in English

Initiatives for open facility and work-style reform in the nuclear hot cell R&D facilities

Irisawa, Eriko; Kato, Chiaki; Yamashita, Naoki; Sano, Naruto; Tagami, Susumu

no journal, , 

no abstracts in English

渦電流探傷用プローブ及び渦電流探傷装置

山口 智彦; Mihalache, O.

not registered

JP, 2019-062223  Patent licensing information  Patent publication (In Japanese)

【課題】配管の内面及び外面に形成された微小欠陥や欠陥形状を的確に検出することができる渦電流探傷用プローブを提供する。 【解決手段】渦電流探傷用プローブ1は、本体2の第1の中心軸O1に沿って、直接磁場を利用した第1の渦電流探傷系3と、間接磁場を利用した第2の渦電流探傷系4とを備える。第1の渦電流探傷系3は、第1の中心軸O2と平行な軸方向に並列して配置された一対の励磁兼検出コイル30A、30Bを備え、第2の渦電流探傷系4は、一対の励磁兼検出コイル30A、30Bの軸方向外側にそれぞれ配置された一対の検出コイル群41A、41Bと、一対の検出コイル群41A、41Bの軸方向外側にそれぞれ配置された一対の励磁コイル40A、40Bとを備え、一対の検出コイル群40A、40Bの各々は、第1の中心軸1を中心として周方向に所定の間隔でそれぞれ配置された複数の検出コイル400A、400Bにより構成されている。