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Journal Articles

Experimental verification of velocity bunching via shot-by-shot measurement at S-band photoinjector and linac

Iijima, Hokuto; Uesaka, Mitsuru*; Sakamoto, Fumito*; Ueda, Toru*; Kumagai, Noritaka*; Serafini, L.*

Japanese Journal of Applied Physics, Part 1, 44(7A), p.5249 - 5253, 2005/01

 Times Cited Count:8 Percentile:33.54(Physics, Applied)

We represent an experimental verification of a bunch compression method named "velocity bunching". The velocity bunching based on the rectilinear compression uses a traveling wave accelerating tube as a compressor. The experiment was performed by an S-band photoinjector and a linac at Nuclear Engineering Research Laboratory, University of Tokyo. The shot-by-shot bunch length was measured to be 0.5 $$pm$$ 0.1 ps (rms) in average by the femtosecond streak camera for a bunch charge of 1 nC. The experimental result is in good agreement with PARMELA simulations.

Journal Articles

I-A. Models for atmospheric releases: I-A.1. Models used by JAERI, Japan

Amano, Hikaru; Atarashi-Andoh, Mariko; Takahashi, Tomoyuki*

IAEA-BIOMASS-3, p.163 - 164, 2003/03

no abstracts in English

Journal Articles

ETDOSE; A Code to simulate tritium transfer in the environment and to evaluate dose

Atarashi-Andoh, Mariko; Amano, Hikaru; Takahashi, Tomoyuki*

Fusion Science and Technology, 41(3), p.470 - 473, 2002/05

During normal operation or an accident of nuclear facilities, tritium will be released mostly as forms of HT and HTO to the environment. ETDOSE is a simple computer code to calculate atmospheric distribution patterns of tritium for an acute and a chronic release of HT and HTO. This code calculates tritium concentrations in air, soil, plant free water and OBT, and estimates dose impact by inhalation of air and ingestion of food. ETDOSE has GUI interface, so anyone can use it very easily. Participation in IAEA's model validation program BIOMASS has been done using this code for BIOMASS Scenario 1. In the scenario, tritium is assumed to be released continuously to the atmosphere as forms of HT or HTO. We shows the outline of ETDOSE and results of the application.

Journal Articles

Development of dose assessment code for accidental tritium releases

Yokoyama, Sumi; Noguchi, Hiroshi

Proceedings of 10th International Congress of the International Radiation Protection Association (IRPA-10) (CD-ROM), 5 Pages, 2000/05

no abstracts in English

Journal Articles

Compact X-ray sources by intense laser interactions with beams and plasmas

Kotaki, Hideyuki; Kando, Masaki; Dewa, Hidenori; Kondo, Shuji; Watanabe, Takahiro*; Ueda, Toru*; Kinoshita, Kenichi*; Yoshii, Koji*; Uesaka, Mitsuru*; Nakajima, Kazuhisa

Lasers Plasma Generation and Diagnostics (Proceedings of SPIE Vol.3935), p.149 - 155, 2000/01

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

Short pulse X-ray generation via backward Thomson scattering on relativistic electron beam

Kotaki, Hideyuki; Nakajima, Kazuhisa*; Kando, Masaki*; Dewa, Hidenori*; Kondo, Shuji; *; Watanabe, Takahiro*; Ueda, Toru*; Nakanishi, Hiroshi*; Yoshii, Koji*; et al.

Inst. Phys. Conf. Ser., (159), p.565 - 567, 1999/00

no abstracts in English

Journal Articles

Intercomparison of model predictions of tritium concentrations in soil and foods following acute airborne HTO exposure

P.J.Barry*; B.M.Watkins*; Y.Belot*; P.A.Davis*; O.Edlund*; D.Galeriu*; W.Raskob*; S.Russell*; Togawa, Orihiko

Journal of Environmental Radioactivity, 42(2-3), p.191 - 207, 1999/00

 Times Cited Count:18 Percentile:45.69(Environmental Sciences)

no abstracts in English

Journal Articles

A model of tritium dose assessment to the public:TRIDOSE

Noguchi, Hiroshi

Purazuma, Kaku Yugo Gakkai-Shi, 73(12), P. 1360, 1997/12

no abstracts in English

Journal Articles

Variation of HTO concentration in air

Noguchi, Hiroshi

Purazuma, Kaku Yugo Gakkai-Shi, 73(12), p.1350 - 1351, 1997/12

no abstracts in English

JAEA Reports

Diffusion Behaviour of Nuclides Considering Pathways in Fractured Crystalline Rocks

Sato, Haruo; ; ; *; *; Yui, Mikazu

PNC TN8410 97-127, 57 Pages, 1997/08

PNC-TN8410-97-127.pdf:1.51MB

Retardation of key nuclides is one of the most important mechanisms to be examined specifically and modelled for the performance assessment of geological disposal of radioactive waste. We have been studing diffusion of nuclides into the pore spaces of the rock matrix, sorption of nuclides on the rock pore surfaces and pore properties to quantify the degree of nuclide retardation in fractured crystalline rock. The work has concentrated on predominant water conducting fracture system in the host granodiorite in the Kamaishi In Situ Test Site, which consists of fracture fillings and altered granodiorite. Through-diffusion experiements to obtain effective and apparent diffusion coefficients (Da and De, respectively) for Na, Cs, HTO, Cl and Se as a function of ionic charge at 22 $$sim$$ 25$$^{circ}$$C and batch sorption experiments for Cs, Sr, Se, $$^{238}$$U and $$^{239}$$Pu were conducted on fracture fillings, altered and intact granodiorite. The experiments only for Se, a redox sensitive element, were done in an N2-atmospheric glove box (O$$_{2}$$ $$<$$ 1 ppm) to keep the chemical species. In situ groundwater (pH8.7$$sim$$9.5) sampled from the same place as rock samples was used for the experiments. Porosity and density of cach rock sample were determined by both water saturation method and mercury porosimetry, and pore-size distribution and specific surface area of pores were measured by mercury porosimetry. The porosity is in the order; fracture fillings (5.6%) $$>$$ altered rock (3.2%) $$>$$ intact rock (2.3%). The pore-size distribution of the intact and altered granodiorite is ranging from 10 nm to 0.2 mm, and the fracture fillings have that of 50 nm to 0.2 mm, but a lot of pores were found around 100 nm and 0.2 mm in the fracture fillings. The effective diffusion coefficients for all species (Na$$^{+}$$, Cs$$^{+}$$, HTO, Cl$$^{-}$$, Se0$$_{3}$$$$^{2-}$$) are in the order of fracture fillings $$>$$ altered rock $$>$$ intact rock in proportion to these porosities. Effective diffusion ...

Journal Articles

Carbon wire type beam profile monitor

Shiwaku, Hideaki

Hoshako, 10(2), p.69 - 72, 1997/04

no abstracts in English

Journal Articles

Radiation effects and safety control of tritium

Yamaguchi, Takenori; Noguchi, Hiroshi

Nihon Genshiryoku Gakkai-Shi, 39(11), p.940 - 941, 1997/00

no abstracts in English

Journal Articles

Radiation effects and safety control of Tritium; Migration behavior of tritium in the envrionment, tritium uptake by Plants

Amano, Hikaru; Atarashi, Mariko

Nihon Genshiryoku Gakkai-Shi, 39(11), p.929 - 931, 1997/00

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

Formation of ultra-thin SiO$$_{2}$$ layer on Si(100) by thermal decomposition of silicon alkoxide

Baba, Yuji; Yamamoto, Hiroyuki; Sasaki, Teikichi

Photon Factory Activity Report, (14), P. 423, 1996/00

no abstracts in English

Journal Articles

Tritium transfer to plants from atomospheric release of molecular tritium

Atarashi, Mariko; Amano, Hikaru

Eisei Kogaku Shimpojiumu Rombunshu, 0, p.181 - 185, 1995/11

no abstracts in English

Journal Articles

Formation of organically bound tritium in plants during the 1994 chronic HT release experiment at Chalk Rever

Amano, Hikaru; Atarashi, Mariko; Noguchi, Hiroshi; Yokoyama, Sumi; Ichimasa, Yusuke*; Ichimasa, Michiko*

Fusion Technology, 28, p.803 - 808, 1995/10

no abstracts in English

36 (Records 1-20 displayed on this page)