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Katsuyama, Jinya; Yamaguchi, Yoshihito; Nemoto, Yoshiyuki; Furuta, Takuya; Kaji, Yoshiyuki
Proceedings of ASME 2022 Pressure Vessels and Piping Conference (PVP 2022) (Internet), 9 Pages, 2022/07
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 
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.
Kim, M.; Malins, A.; Sakuma, Kazuyuki; Kitamura, Akihiro; Machida, Masahiko; Hasegawa, Yukihiro*; Yanagi, Hideaki*
RIST News, (64), p.3 - 16, 2018/09
To improve the accuracy of simulations for air dose rates over fallout contaminated areas, the distribution of the radionuclides within the environment should be modelled realistically, e.g. considering differences in radioactivity levels between agricultural land, urban surfaces, and forest compartments. Moreover simulations should model the shielding of 
rays by buildings, trees and land topography. 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, based on nine common Japanese designs, individual conifer and broadleaf trees, and the topography of the land surface. Models are generated from Digital Elevation Model (DEM) and Digital Surface Model (DSM) datasets, and refined by users assisted with ortho-photographs of target sites. Completed models are exported from the system in a format suitable for the Particle and Heavy Ion Transport code System (PHITS) for the calculation of air dose rates and other radiological quantities. 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.
Endo, Akira; Yamaguchi, Yasuhiro; Sato, Osamu*; Ishigure, Nobuhito*
Uran Kako Kojo Rinkai Jiko Ni Taisuru Kankyo Sokutei, Senryo Suitei (NIRS-M-150), p.163 - 175, 2000/00
no abstracts in English
; Research Committee on Reactor Physics
JAERI-M 91-015, 188 Pages, 1991/02
no abstracts in English
; ; *; *; ; ; ; ; ; ; et al.
JAERI-M 5794, 71 Pages, 1974/07
no abstracts in English
Kai, Takeshi; Ogawa, Tatsuhiko; Abe, Shinichiro; Sato, Tatsuhiko
no journal, ,
In study of radiation interaction induced in small spatial region of nanoscale, it is important to reveal electron behavior below 1 keV and its energy deposition. However, current radiation transport simulation code PHITS cannot simulate precisely the behavior in the materials. To clear the question, we have developed track structure code, also have an implementation plan of the code into PHITS. We calculated the microscopic behavior of the electron in water by using the developed code. As the results, we could predict theoretically that the electron thermalization progress contemporaneously with formation of prehydrated electron against previous prediction. In this presentation, we report our outcomes obtained from the developed track structure code, future plan for and implementation of the code into the PHITS as well as the functional extension.
Kai, Takeshi
no journal, ,
It is impossible to analyze radiation interaction in nano-scale by using particle transport codes such as PHITS because the code cannot simulate microscopic behavior of low energy electrons. We have developed a dynamic Monte Carlo code which can simulate the behavior. In this presentation, we explain the calculation methods of electron collision cross section included in the code as well as the electron behavior in water. We also show the calculated results for a primary electron transport and secondary electrons deceleration. From the results, we perform DNA damage prediction involved in the low energy electrons. We found novel complex DNA damage mechanism which induces radiation biological effect such as cell death or mutation. We also present an implementation of the code into PHITS and future plans for the functional extension of PHITS.
Kai, Takeshi; Sato, Tatsuhiko; Liamsuwan, T.*; Nikjoo, H.*
no journal, ,
A general purpose particle transport simulation code, PHITS is expected to apply dose evaluation in macroscopic systems as well as radiation interaction investigation in nanoscale for study of interaction between radiations and materials. To clear the problem, we implemented track structure calculation codes into the PHITS. The codes make microscopic behavior as well as energy depositions (ionization and excitation) of the electrons, protons and carbon ions possible. The PHITS could evaluate radiation dose of cellar size. As this implementation, DNA damage predictions, which need radiation interaction in the molecular levels, will be expected using this track-structure simulation mode.
Kai, Takeshi; Matsuya, Yusuke; Sato, Tatsuhiko
no journal, ,
A general purpose particle transport simulation code, PHITS is expected to apply dose evaluation in macroscopic systems as well as radiation interaction investigation in nanoscale for study of interaction between radiations and materials. To clear the problem, we developed track structure mode codes of the PHITS. We predicted yields of the DNA damage by the mode. We found that the mode could reproduce experimental results of the DNA damage yields by electron irradiation into the cells. The PHITS could evaluate radiation dose of cellar size. The track structure mode made the prediction of DNA damage yields possible.
Ogawa, Toru
no journal, ,
Fuel debris after post accident has wide-ranging characters depending on the accident progression paths. Their physical forms should also vary due to retrieval methods. With those changing variables, proper management methods have to be selected. Besides, the long-term alterations of fuel debris have to be considered. In the analytical system, DEM (discrete element method) is applied to simulate water-containing debris of arbitrary particle-size distribution. Monte Carlo particle transportation analysis is applied before and after water draining. The simulation can be made for both experimental
Endo, Yuya; Yamaguchi, Katsuhiko*; Takase, Tsugiko*; Uezu, Yasuhiro; Tsukada, Hirofumi*
no journal, ,
After the Fukushima Dai-ichi Nuclear Power Station accident, the Ministry of the Environment decided that the additional annual dose in a high exposure situation (less than 20 mSv/y) reduced to 1 mSv/y or less. The additional annual dose is calculated by ambient dose equivalent. However, the relationship among air kerma, ambient dose equivalent and effective dose seems to be identically by many people. In addition, conversion coefficients from air kerma and ambient dose equivalent to effective dose have been considered to change as time proceeds because the half-lives of Cs and Cs are different. Therefore, agricultural land in an evacuation zone was selected to evaluate relationship among them. Furthermore, the actual environment such as soil will be simulated by using a Monte Carlo radiation transport code PHITS. Finally, the relationship will be verified by comparing the results calculated by PHITS to ones obtained from actual environmental monitoring.
Endo, Yuya; Uezu, Yasuhiro; Takase, Tsugiko*; Yamaguchi, Katsuhiko*; Tsukada, Hirofumi*
no journal, ,
no abstracts in English
Kai, Takeshi
no journal, ,
A general purpose particle transport simulation code, PHITS is expected to apply dose evaluation in macroscopic systems as well as radiation interaction investigation in nanoscale for study of interaction between radiations and materials. To clear the problem, we developed track structure mode. The PHITS could evaluate radiation dose of cellar size. The track structure mode made the prediction of DNA damage yields possible. In this presentation, we will introduce the method for utilization of the track structure mode to get new users.
Takahashi, Yuta; Kakuda, Ayaka; Enomoto, Mayu*; Imaizumi, Ken*; Osugi, Takeshi; Sone, Tomoyuki; Kuroki, Ryoichiro
no journal, ,
no abstracts in English
Kurikami, Hiroshi
no journal, ,
JAEA operates RESET, a system that predicts decontamination effects to support local government decontamination plans. In the next phase, we continue research on radiation assessment using advanced radiation transport simulation tools such as 3D-ADRES.
Hashimoto, Shintaro; Sato, Tatsuhiko; Iwamoto, Yosuke; Ogawa, Tatsuhiko; Furuta, Takuya; Abe, Shinichiro; Kai, Takeshi; Matsuya, Yusuke; Matsuda, Norihiro; Hirata, Yuho; et al.
no journal, ,
PHITS is a general-purpose radiation transport simulation code that has been developed mainly by JAEA in cooperation with domestic and foreign research institutes. PHITS can simulate various radiation behaviors in all kinds of materials, and has been used by more than 7,000 researchers and engineers in a wide range of fields, including science, engineering, and medicine. We released the latest version, PHITS 3.27, in March 2022. This version includes several valuable improvements such as ITSART, a track-structure mode for arbitrary materials, and availability of nuclear data libraries for deuterons, alpha particles, and photons. In this presentation, we will introduce the new improvements and their features.
Ogawa, Tatsuhiko; Iwamoto, Yosuke; Hashimoto, Shintaro; Sato, Tatsuhiko; Matsuda, Norihiro; Kunieda, Satoshi; 
elik, Y.*; Furutachi, Naoya*; Niita, Koji*; Furuta, Takuya; et al.
no journal, ,
PHITS is a general-purpose radiation transport simulation code that has been developed mainly by JAEA in cooperation with domestic and foreign research institutes. We released the latest version, PHITS 3.27, in March 2022. Since SATIF-14 held in 3 years ago, following updates were implemented (1)Extension of the cross section data reading module, (2)Modernization of burn-up calculation code DCHAIN, (3)Functionality to calculate the dependence of the result on the input parameters, (4)Interactive 3D geometry viewer,PHIG-3D, (5)Cosmic ray source function, (6)Track-structure calculation models, which calculate the atomic-scale reactions of charged particles on event-by-event basis, for electrons, positions, and heavy ions, (7)GUI-version RT-PHITS development, (8)random number generation by Xor-shift64 algorithm, (9)User-defined stopping power reading module, (10)EXFOR data reading module, (11)Photon-induced mu-mu pair production model. In addition, a bench, ark study conducted by Iwamoto et al, is also presented to explain the importance of the new cross section reading module.
