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Co 
-ray high dose rate at radiation processing levelKojima, Takuji; Tachibana, Hiroyuki; Haneda, Noriyuki; Kaneko, Hirohisa; Haruyama, Yasuyuki; Tanaka, Ryuichi*
Radioisotopes, 50(7), p.291 - 300, 2001/07
Plaque type 
Co -ray sources having wide radiation field with high absorbed dose rates ranging of about 100
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 Co -ray plaque sources covering wide dose-rate range of 520,000 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 10100 Gy/h at the AIST and high-dose rates of 520,000 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 
Gy with uncertainty of 
2.2% at 95% confidence level.
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：50.63(Chemistry, Inorganic & Nuclear)no abstracts in English
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：74.46(Chemistry, Inorganic & Nuclear)no abstracts in English
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：63.68(Chemistry, Physical)no abstracts in English
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：60.43(Chemistry, Physical)no abstracts in English
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
; Tanaka, Ryuichi; Sunaga, Hiromi; ; Tanaka, Susumu; Haruyama, Yasuyuki; Agematsu, Takashi; Matsuda, Sumio*; *; *; et al.
JAERI-M 89-085, 164 Pages, 1989/07
no abstracts in English
Haruyama, Yasuyuki; Morita, Yosuke; Seguchi, Tadao; Tanaka, Ryuichi; ; Yotsumoto, Keiichi; Yoshida, Kenzo
JAERI-M 88-197, 31 Pages, 1988/10
no abstracts in English
V
Cr
by photoemission spectroscopyHaruyama, 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 TiVCr by means of photoemission spectroscopy. The photoemission spectra in TiVCr 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.
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 TiVCr. 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.
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
