Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Oshima, Masumi*; Goto, Jun*; Hayakawa, Takehito*; Asai, Masato; Kin, Tadahiro*; Shinohara, Hirofumi*
Isotope News, (790), p.19 - 23, 2023/12
When analyzing samples that contain many radionuclides at various concentrations, such as radioactive waste or fuel debris, it is difficult to apply general spectrum analysis methods and is necessary to chemically separate each nuclide before quantifying it. The chemical separation is especially essential for analysis using a liquid scintillation counter (LSC). In this report, the authors explain the newly developed spectral determination method (SDM) in which the entire spectrum is fitted to quantify radioactivity of nuclides mixed in a sample. By applying the SDM to - and X-ray spectrum measured by LSC and -ray spectrum measured by Ge detector simultaneously, the authors demonstrated that radioactivity of 40 radionuclides mixed in a sample at concentrations varying by two orders could be quantified, which is useful to simplify chemical separation process in radionuclide quantification.
Ikebe, Yurie*; Oshima, Masumi*; Bamba, Shigeru*; Asai, Masato; Tsukada, Kazuaki; Sato, Tetsuya; Toyoshima, Atsushi*; Bi, C.*; Seto, Hirofumi*; Amano, Hikaru*; et al.
Applied Radiation and Isotopes, 164, p.109106_1 - 109106_7, 2020/10
Times Cited Count:2 Percentile:23.17(Chemistry, Inorganic & Nuclear)Boron Neutron Capture Therapy (BNCT) is a radiotherapy for the treatment of intractable cancer. In BNCT precise determination of B concentration in whole blood sample before neutron irradiation is crucial for control of the neutron irradiation time and the neutron dosimetry. We have applied the Charged Particle Activation Analysis (CPAA) to non-destructive and accurate determination of B concentration in whole blood sample. The experiment was performed at JAEA Tandem Accelerator using an 8 MeV proton beam. The 478 keV ray of Be produced in the B(p,)Be reaction was used to quantify the B, and rays of Co originating from the reaction with Fe in blood was used to normalize the -ray intensity. The results demonstrated that the present CPAA method can be applied to the determination of the B concentration in the blood sample.
Oshima, Masumi*; Goto, Jun*; Haraga, Tomoko; Kin, Tadahiro*; Ikebe, Yurie*; Seto, Hirofumi*; Bamba, Shigeru*; Shinohara, Hirofumi*; Morimoto, Takao*; Isogai, Keisuke*
Journal of Nuclear Science and Technology, 57(6), p.663 - 670, 2020/06
Times Cited Count:0 Percentile:0.01(Nuclear Science & Technology)Gamma-gamma coincidence measurement utilized in -ray spectroscopy experiments is well known to be effective for the improvement of signal-to-noise ratio in a -ray spectrum. We study its applicability to determination of long-lived radioactive nuclides in environmental samples. The -ray simulation code Geant 4.10.2 was used. We took up 35 nuclides which need to be determined for the evaluation of fission product leakage at the nuclear accident in the Fukushima nuclear power plants. Among them five nuclides of Co, Nb, Cs, Eu and Eu can be the objectives of the multiple -ray detection method. The simulation results indicate that the signal-to-noise ratio can be improved by a factor between 9.8 and 283, and the detection limit by a factor between 2.7 and 8.5 relative to the singles measurement, implying that the method can be well applied to the determination of the long-lived radioactive nuclides.
Oshima, Hirofumi
RANDEC Nyusu, (70), P. 1, 2006/09
no abstracts in English
Oshima, Hirofumi; Hayashi, Naomi; ; Muto, Shigeo; ; ; Watanabe, Fumitaka
JNC TN8420 99-003, 46 Pages, 1998/11
None
Kashiro, Kashio; Miyo, Hiroaki; Asano, Takashi; ; Shinada, Masanori*; ; Oshima, Hirofumi
PNC TN8410 90-054, 203 Pages, 1990/05
None
Oshima, Hirofumi; Miyo, Hiroaki; Asano, Takashi; Kashiro, Kashio; ; Shinada, Masanori*;
PNC TN8410 89-015, 41 Pages, 1989/02
None
Oshima, Hirofumi; Tsuji, Nobuo*
Nihon Genshiryoku Gakkai-Shi, 26(4), p.339 - 346, 1984/04
Times Cited Count:0 Percentile:0.02(Nuclear Science & Technology)Oshima, Hirofumi; Naruki, Kaoru
Nihon Genshiryoku Gakkai-Shi, 25(11), p.918 - 924, 1983/11
Times Cited Count:1 Percentile:22.46(Nuclear Science & Technology); Naruki, Kaoru*; Koizumi, Masumichi*; ; Oshima, Hirofumi;
Journal of Nuclear Science and Technology, 20(7), p.529 - 536, 1983/00