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Journal Articles

Ionization chamber system for calibration of $$^{60}$$Co $$gamma$$-ray high dose rate at radiation processing level

Kojima, Takuji; Tachibana, Hiroyuki; Haneda, Noriyuki; Kaneko, Hirohisa; Haruyama, Yasuyuki; Tanaka, Ryuichi*

Radioisotopes, 50(7), p.291 - 300, 2001/07

Plaque type $${}^{60}$$Co $$gamma$$-ray sources having wide radiation field with high absorbed dose rates ranging of about 100$$sim$$10,000Gy/h is widely used in radiation processing e.g. radiation sterilization of health care products. Calibration of such radiation processing doses or dose rates is not easy to be performed at the present standard dosimetry laboratories, since characteristics of most of their radiation field can provide collimated gamma-rays from a point source and/or lower dose rates, which are quite different from those of panoramic (uncollimated) radiation fields used in radiation processing. The high-dose calibration technique using a parallel-plate ionization chamber system has developed in the JAERI dose calibration facility. The facility equips two $${}^{60}$$Co $$gamma$$-ray plaque sources covering wide dose-rate range of 5$$sim$$20,000 Gy/h which have overlapping dose-rate region with that at the National Institute of Advanced Industrial Science and Technology(AIST), the national standard Dosimetry laboratory in Japan. Consistency of dose calibration results at JAERI and those at AIST was verified without additional correction regarding to difference in characteristics of radiation fields involving current/exposure -rate conversion coefficients given in the dose rate level of 10$$sim$$100 Gy/h at the AIST and high-dose rates of 5$$sim$$20,000 Gy/h at JAERI. It demonstrates our dose traceability to the AIST from the technical point of view. The dose calibration at JAERI covers the high-dose range of 0.5 to $$1.60times{10}^5$$ Gy with uncertainty of $$pm$$2.2% at 95% confidence level.

Journal Articles

Development of portable ESR spectrometer as a reader for alanine dosimeters

Kojima, Takuji; Haruyama, Yasuyuki; Tachibana, Hiroyuki; Tanaka, Ryuichi; Okamoto, Jiro; *; *

Applied Radiation and Isotopes, 44(1-2), p.361 - 365, 1993/00

 Times Cited Count:5 Percentile:50.67(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Thin film alanine-polyethylene dosimeter

Kojima, Takuji; H.L.A.Ranjith*; Haruyama, Yasuyuki; Kashiwazaki, Shigeru*; Tanaka, Ryuichi

Applied Radiation and Isotopes, 44(1-2), p.41 - 45, 1993/00

 Times Cited Count:12 Percentile:74.55(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Recent progress in JAERI alanine/ESR dosimeter system

Kojima, Takuji; Tachibana, Hiroyuki; Haruyama, Yasuyuki; Tanaka, Ryuichi; Okamoto, Jiro

Radiation Physics and Chemistry, 42(4-6), p.813 - 816, 1993/00

 Times Cited Count:8 Percentile:63.78(Chemistry, Physical)

no abstracts in English

Journal Articles

Alanine/ESR dosimetry system for routine use in radiation processing

Kojima, Takuji; Haruyama, Yasuyuki; Tachibana, Hiroyuki; Tanaka, Ryuichi; Okamoto, Jiro; *; *; *; Kashiwazaki, Shigeru*

Radiation Physics and Chemistry, 42(4-6), p.757 - 760, 1993/00

 Times Cited Count:7 Percentile:60.53(Chemistry, Physical)

no abstracts in English

Journal Articles

Fading characteristics of an alanine-polystyrene dosimeter

Kojima, Takuji; L.Chen*; Haruyama, Yasuyuki; Tachibana, Hiroyuki; Tanaka, Ryuichi

Applied Radiation and Isotopes, 43(7), p.863 - 867, 1992/00

no abstracts in English

JAEA Reports

Radiation Resistance of solar cells for space application, I; Study on the irradiation procedure of electron beams

; Tanaka, Ryuichi; Sunaga, Hiromi; ; Tanaka, Susumu; Haruyama, Yasuyuki; Agematsu, Takashi; Matsuda, Sumio*; *; *; et al.

JAERI-M 89-085, 164 Pages, 1989/07

JAERI-M-89-085.pdf:3.86MB

no abstracts in English

JAEA Reports

Comparison of gamma-ray and electron beam induced degradation of polymer insulating materials

Haruyama, Yasuyuki; Morita, Yosuke; Seguchi, Tadao; Tanaka, Ryuichi; ; Yotsumoto, Keiichi; Yoshida, Kenzo

JAERI-M 88-197, 31 Pages, 1988/10

JAERI-M-88-197.pdf:0.92MB

no abstracts in English

Oral presentation

Electronic structure near the surface region in the ternary transition metal alloy Ti$$_{35}$$V$$_{25}$$Cr$$_{40}$$ by photoemission spectroscopy

Haruyama, Yuichi*; Teraoka, Yuden; Matsui, Shinji*

no journal, , 

In this study, we have investigated the chemical composition and the electronic structure near surface region in the ternary transition metal alloy Ti$$_{35}$$V$$_{25}$$Cr$$_{40}$$ by means of photoemission spectroscopy. The photoemission spectra in Ti$$_{35}$$V$$_{25}$$Cr$$_{40}$$ were measured as a function of annealing temperature and photon energy. With increasing annealing temperature, the intensity originating from Ti increased. This indicates that the redistribution of the constituent transition metals was caused by the annealing. From the photon energy dependence of the energy distribution curves and constant initial state spectra in the 3p-3d resonant photoemission region of each transition metal, the orbital character of the observed features in the valence band region was clarified.

Oral presentation

Surface states of hydrogen storage alloy TiVCr

Haruyama, Yuichi*; Teraoka, Yuden; Matsui, Shinji*

no journal, , 

An alloy of TiVCr system is a solid-sulution type three elements alloy with a BCC crystal structure. It is known as a hydrogen storage material. The amount of hydrogen storage is about 2.3w%. It is relatively larger comparing to that of other hydrogen storage metals. Prior to hydrogen storage, an initial activation process is needed to change its surface atomic structure. We performed inner-shell photoemission spectroscopy, balence band photoemission spectroscopy, and X-ray absorption near-edge spectroscopy measurements to study an electronic structure and effects of hydrogen absorption in a hydrogen storage alloy such as the Ti$$_{35}$$V$$_{25}$$Cr$$_{40}$$. Furthermore, thermal annealing effects of them were investigated. With increasing thermal anneal temperature, photoemission intensity of Ti increased comparing to V and Cr. This fact implies that Ti segregates near surface by thermal annealing.

Oral presentation

Upgrading and achievements in the industrial analysis beamline BL05

Hasegawa, Takayuki*; Uemura, Masaharu*; Takueuchi, Kazuki*; Kodaka, Takuya*; Fukada, Noboru*; Umesaki, Norimasa*; Fukushima, Sei*; Teraoka, Yuden; Haruyama, Yuichi*; Niibe, Masahito*; et al.

no journal, , 

no abstracts in English

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