JOPSS - Search Results

Journal Articles

Study of charged particle activation analysis, 2; Determination of boron concentration in human blood samples

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

https://doi.org/10.1016/j.apradiso.2020.109106

Times Cited Count：2 Percentile：24.28(Chemistry, Inorganic & Nuclear)

Boron Neutron Capture Therapy (BNCT) is a radiotherapy for the treatment of intractable cancer. In BNCT precise determination of $^{10}$ 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 $^{10}$ 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 $^{7}$ Be produced in the $^{10}$ B(p,) $^{7}$ Be reaction was used to quantify the $^{10}$ B, and rays of $^{56}$ 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 $^{10}$ B concentration in the blood sample.

Journal Articles

Analysis of sequential charged particle reaction experiments for fusion reactors

Yamauchi, Michinori*; Hori, Junichi*; Ochiai, Kentaro; Sato, Satoshi; Nishitani, Takeo; Kawasaki, Hiromitsu*

Fusion Engineering and Design, 81(8-14), p.1577 - 1582, 2006/02

https://doi.org/10.1016/j.fusengdes.2005.09.066

Times Cited Count：1 Percentile：9.98(Nuclear Science & Technology)

no abstracts in English

Journal Articles

New approach to measure double-differential charged-particle emission cross sections of several materials for a fusion reactor

Kondo, Keitaro; Takagi, Satoshi*; Murata, Isao*; Miyamaru, Hiroyuki*; Takahashi, Akito*; Kubota, Naoyoshi; Ochiai, Kentaro; Nishitani, Takeo

Fusion Engineering and Design, 81(8-14), p.1527 - 1533, 2006/02

https://doi.org/10.1016/j.fusengdes.2005.08.070

Times Cited Count：14 Percentile：68.12(Nuclear Science & Technology)

In a fusion reactor development, double-differential charged-particle emission cross sections(DDXc) are necessary to estimate nuclear heating and material damages of candidate materials irradiated with neutrons. Especially in light nuclei such as Be, Li, and C, nuclear reactions are complicated and difficult to estimate energy spectra of emitted particles based only on theoretical calculations Therefore development of a new technique for precise measurements of DDXc is quite important. Recently we successfully developed a new spectrometer for measurement of DDXc using a pencil-beam DT neutron source of FNS in JAERI. In the present study we carried out measurements of DDXc of $^{9}$ Be, $^{12}$ C, $^{19}$ F, and $^{27}$ Al using the spectrometer. The present technique was valid from the result of measurement for the $^{27}$ Al(n,x) reactions. Slight differences appeared between measured data and evaluation or previous experimental values for $^{9}$ Be(n,x) reactions at backward scattering angle and in lower energy region.

Journal Articles

Optimized energetic particle emissions from Xe clusters in intense laser fields

Fukuda, Yuji; Yamakawa, Koichi; Akahane, Yutaka; Aoyama, Makoto; Inoue, Norihiro*; Ueda, Hideki; Kishimoto, Yasuaki

Physical Review A, 67(6), p.061201_1 - 061201_4, 2003/06

https://doi.org/10.1103/PhysRevA.67.061201

Times Cited Count：57 Percentile：88.04(Optics)

We have probed the interaction of intense laser fields with Xe clusters by measuring the energy and charge state distributions of emitted ions and electrons using ultrafast 20 fs pulses. This work demonstrates that the energetic particle emissions from laser-cluster interactions can be optimized by manipulating the character of ultrafast laser pulses, i.e. pulse duration and sign of chirp.

Journal Articles

Clinical review of the Japanese experience with boron neutron capture therapy and a proposed strategy using epithermal neutron beams

Nakagawa, Yoshinobu*; Pooh, K. H.*; Kobayashi, Toru*; Kageji, Teruyoshi*; Uyama, Shinichi*; Matsumura, Akira*; Kumada, Hiroaki

Journal of Neuro-Oncology, 62(1), p.87 - 99, 2003/04

https://doi.org/10.1023/A:1023234902479

Times Cited Count：126 Percentile：83.31(Oncology)

Our concept of boron neutron capture therapy (BNCT) is selective destruction of tumor cells using the heavy-charged particles Yielded through 10B(n, alpha)7 Li reactions. In the analysis of side effects due to radiation, we included all the 159 patients treated between 1977 and 2001. With respect to the radiation dose (i.e. physical dose of boron n-alpha reaction), the new protocol prescribes a minimum tumor volume dose of 15Gy or, alternatively, a minimum target volume dose of 18Gy. The maximum vascular dose should not exceed 15Gy (physical dose of boron n-alpha reaction) and the total amount of gamma rays should remain below 10Gy, including core gamma rays from the reactor and capture gamma in brain tissue. The outcomes for 10 patients who were treated by the new protocol using a new mode composed of thermal and epithermal neutrons are reported.

Journal Articles

Radioactivity production around the surface of a cooling water pipe in a D-T fusion reactor by sequential charged particle reactions

Hori, Junichi; Maekawa, Fujio; Wada, Masayuki*; Ochiai, Kentaro; Yamauchi, Michinori*; Morimoto, Yuichi*; Terada, Yasuaki; Klix, A.; Nishitani, Takeo

Fusion Engineering and Design, 63-64, p.271 - 276, 2002/12

https://doi.org/10.1016/S0920-3796(02)00127-8

Times Cited Count：2 Percentile：17.03(Nuclear Science & Technology)

In order to the waste management method and the safety design of future D-T fusion reactor, it is important to consider the radioactivity productions via not only primary neutron reactions but also sequential charged particle reactions (SCPR). Especially, on the surface of a coolant channel many recoiled protons are generated by the neutron irradiation with coolant water, so it is apprehensive that the undesirable radioactive nuclide production yields via SCPR are enhanced. In this work, the laminated sample pieces of fusion material foils (V, Fe, W, Ti, Pb, Cu) were made and attached on a polyethylene board to simulate water flowing inside a coolant channel. They were irradiated with D-T neutrons. The effective radioactivity cross section and the depth distribution of the radioactivity production yields due to SCPR were obtained for each material. On the other hand, the estimated values were compared with the experimental ones.

Journal Articles