||Kullapha Chaiwongkhot1, Tadahiro Kin, Ryo Sasaki, Hikaru Sato, Yuta Nagata, Tomohiro Komori, Yukinobu Watanabe, A Feaibility Study of 3D Cosmic-Ray Muon Tomography with a Portable Muography Detector, JPS Conference Proceedings (Proceedings of the Second International Symposium on Radiation Detectors and Their Uses (ISRD2018)) 24, 011010 (2019), https://doi.org/10.7566/JPSCP.24.011010, 24, 011010, 6 pages, 2019.01, The Maximum Likelihood-Expectation Maximization (ML-EM) method was applied to 3D image reconstruction of cosmic-ray muon tomography. The feasibility was examined by using Monte Carlo simulation for a simple configuration where two lead blocks were placed at a different height from a muography detector. The 2D projection of the average thickness of the blocks as a function of the muon direction was simulated for multiple detection positions. The 3D image of the density profile was reconstructed by applying the ML-EM method to the simulated projections. It was found that the image reproduces reasonably well the position of the two blocks. The effect of the limited number of detection positions and the number of iteration in the ML-EM method on the image reconstruction was investigated in detail..
||Tadahiro Kin1, Md. Kawchar Ahmed Patwary, Masaki Kamida, Katsumi Aoki, Naoto Araki, Kosuke Yoshinami, Yukinobu Watanabe, Masatoshi Itoh, Development of Radioisotopes Production Method by Accelerator-Based Neutron: Activity at Kyushu University, JPS Conference Proceedings (Proceedings of the Second International Symposium on Radiation Detectors and Their Uses (ISRD2018)) 24, 011010 (2019), https://doi.org/10.7566/JPSCP.24.011031, 24, 011031, 6 pages, 2019.01, We have studied Radioisotopes (RIs) production by the accelerator-based neutron method with neutrons generated via the (d,n) reaction on C or Be in the incident energy range less than 50 MeV. The study has been conducted by the two approaches: proposal of new production routes or new RIs with the accelerator-based neutron method and systematic measurements of double-differential thick-target neutron yields (DDTTNYs). In the study, we have proposed effective production methods of 64Cu for a new PET RI and 92Y for application of radio immunotherapy. Moreover, the DDTTNYs have been systematically measured by the multiple-foil activation method, and a new unfolding code with artificial neural network was developed for the unfolding process. In the present paper, our research activity and results are reviewed comprehensively to show examples of 64Cu production and a TTNY measurement of C(d,n) reaction at 12-MeV deuteron..
||Tadahiro Kin, Yukimasa Sanzen, Masaki Kamida, Yukinobu Watanabe, Masatoshi Itoh, Production of 92Y via the 92Zr(n, p) reaction using the C(d, n) accelerator neutron source, 2016 International Conference on Nuclear Data for Science and Technology, ND 2016
International Conference on Nuclear Data for Science and Technology, 10.1051/epjconf/201714608009, 146, 2017.09, We have proposed a new method of producing medical radioisotope 92Y as a candidate of alternatives of 111In bioscan prior to 90Y ibritumomab tiuxetan treatment. The 92Y isotope is produced via the 92Zr (n,p) reaction using accelerator neutrons generated by the interaction of deuteron beams with carbon. A feasibility experiment was performed at Cyclotron and Radioisotope Center, Tohoku University. A carbon thick target was irradiated by 20-MeV deuterons to produce accelerator neutrons. The thick target neutron yield (TTNY) was measured by using the multiple foils activation method. The foils were made of Al, Fe, Co, Ni, Zn, Zr, Nb, and Au. The production amount of 92Y and induced impurities were estimated by simulation with the measured TTNY and the JENDL-4.0 nuclear data..
||Tadahiro KIN, Takaya Kawagoe, Shouhei Araki, Yukinobu Watanabe, Production of high-purity medical radio isotope 64Cu with accelerator-based neutrons generated with 9 and 12 MeV deuterons, Journal of Nuclear Science and Technology, http://dx.doi.org/10.1080/00223131.2017.1344585, 54, 10, 1123-1130, 2017.07, We conducted a feasibility study for producing a high-purity medical radioisotope 64Cu from natural zinc with accelerator-based neutrons. 64Cu isotopes were produced via the 64Zn(n,p) reaction. The accelerator-based neutrons were generated via the C(d,n) reaction using low-energy deuterons of 9 and 12 MeV on a 1-mm-thick carbon target. First, the production purity was estimated using the evaluated nuclear data library JENDL-4.0 and our previously measured thick target neutron yield. We found that even when natural zinc was used as the starting material, significantly high-purity 64Cu could be obtained. Next, irradiation experiments for producing 64Cu using natural zinc were conducted at Kyushu University Tandem Laboratory, with the amounts of 64Cu isotopes and other gamma-emission nuclides measured by a high-purity germanium detector. As a result, high-purity 64Cu isotopes of 1.11(49) × 100 and 3.70 (17) × 100 Bq/g/uC were produced with incident deuteron energies of 9 and 12 MeV, respectively..
||Tadahiro KIN, Kullapha Chaiwongkhot, Hiroaki Ohno, Kazuhiro Kondo, Yukinobu Watanabe, Measurement of Zenith and Azimuth Angular Differential Flux of Cosmic-ray Muons Using a Prototype Portable Muography Detector, JPS Conference Proceedings, http://dx.doi.org/10.7566/JPSCP.11.070006, 11, 070006, 6 pages, 2016.11, We have developed a prototype portable muography detector and applied it to measurement of zenith and azimuth angular differential fluxes of cosmic-ray muons on the ground. The detector system was operated stably and the obtained angular fluxes were consistent with the well-known ones. This result demonstrated that the prototype detector has basic performance for muography after careful realignment..
||Takaya Kawagoe, Tadahiro KIN, Shouhei Araki, Yukinobu Watanabe, Measurement of neutron yield by multiple-foil activation unfolding method for medical radioisotopes production using accelerator neutrons, the 2014 Symposium on Nuclear Data, http://dx.doi.org/10.11484/jaea-conf-2015-003, JAEA-Conf 2015-003, 297-302, 2016.03, We measured the angle-differential TTNYs of the C(d,n) reaction at Ed = 12 MeV using multiple-foil activation unfolding method. The spectral shape was in good agreement with previous experimental data..
||Tadahiro KIN, Yukinobu Watanabe, Development of a Remote and Multipoint Air-dose Rate Monitoring System Using Webcams, 2015 IEEE Nuclear Science Symposium and Medical Imaging Conference, 3 pages, 2015.11, We propose a new webcam-based air-dose rate monitoring system, in which multiple webcams are driven remotely by a single PC..
||Tadahiro KIN, Yasuki Nagai, Nobuyuki Iwamoto, Futoshi Minato, Osamu Iwamoto, Yuichi Hatsukawa, Mariko Segawa, Hideo Harada, Chikara Konno, Kentaro Ochiai, Kosuke Takakura, New Production Routes for Medical Isotopes 64Cu and 67Cu Using Accelerator Neutrons, Journal of the Physical Society of Japan, 82, 034201-8 pages, 2013.02, We have measured the activation cross sections producing 64Cu and 67Cu, promising medical radioisotopes for molecular imaging and radioimmunotherapy, by bombarding a natural zinc sample with 14 MeV neutrons. We estimated the production yields of 64Cu and 67Cu by fast neutrons from natC(d,n) with 40MeV 5mA deuterons. We used the present result together with the evaluated cross section of the (n,x) reaction on Zn isotopes. The calculated 64Cu yield is 1.8 TBq (175 g 64Zn) for 12 hours of irradiation; the yields of 67Cu by 67Zn(n,p)67Cu and 68Zn(n,x)67Cu were 249 GBq (184 g 67Zn) and 287 GBq (186 g 68Zn) at the end of 2 days of irradiation, respectively. From the results, we proposed a new route to produce 67Cu with very little radionuclide impurity via the 68Zn(n,x)67Cu reaction, and showed the 64Zn(n,p)64Cu reaction to be a promising route to produce 64Cu. Both 67Cu and 64Cu should be noted to be produced by using fast neutrons..
||T. KIN, K. Furutaka, S. Goko, H. Harada, J. Hori, M. Igashira, T. Kamiyama, T. Katabuchi, A. Kimura, K. Kino, F. Kitatani, Y. Kiyanagi, M. Koizumi, M. Mizumoto, S. Nakamura, M. Ohta, M. Oshima, and Y. Toh, THE “4π GERMANIUM SPECTROMETER” FOR MEASUREMENTS OF NEUTRON CAPTURE CROSS SECTIONS BY THE TIME-OF-FLIGHT METHOD AT THE J-PARC/MLF/NNRI, Journal of the Korean Physical Society, 59, 1769, 2011.08.
||Tadahiro Kin, Masumi Oshima, Kazuyoshi Furutaka, Mitsuo Koizumi, Yosuke Toh, Atsushi Kimura, Identification of Nuclear Levels of 34S for Determination of the Neutron Capture Cross Section, Capture Gamma-Ray Spectroscopy and Related Topics, AIP Conference Proceedings 1090, 575, 2009.01.
||Tadahiro Kin, Ken-ichi Makino, Nobuo Noda, Kazuharu Koide and Masahiro Nakano, The Molecular Dynamics Calculation of Clathrate Hydrate Structure Stability for Innovative Organ Preservation Method, International Journal of Innovative Computing, Information and Control, 4, 2, 249, 2008.02.
||Tadahiro Kin, Masumi Oshima, Kazuyoshi Furutaka, Mitsuo Koizumi, Yosuke Toh and Atsushi Kimura, Development of a Spectrometer for Multiple Prompt Gamma-Ray Measurement to Identify Nuclear Levels, FRONTIERS IN NUCLEAR STRUCTURE, ASTROPHYSICS, AND REACTIONS “FINUSTAR 2”, AIP CONFERENCE PROCEEDINGS 1012, 374, 2008.01.
||Tadahiro KIN, Ken-ichi MAKINO, Kazuharu KOIDE, Tetsuya NEMOTO, Molecular Dynamics Simulation of Complex Phase Transition of Clathrate Hydrates in Living Body, 2006 International Conference on Innovative Computing, Information and Control, 556, 2007.01.
||Tadahiro Kin, Fuminobu Saiho, Sin-ya Hohara, Katsuhiko Ikeda, Kiyohisa Ichikawa, Yusuke Yamashita, Minoru Imamura, Genichiro Wakabayashi, Nobuo Ikeda, Yusuke Uozumi, Masaru Matoba, Norihiko Koori, Proton Production Cross Sections for Reactions Induced by 300 and 392 MeV Protons, International Conference on Nuclear Data for Science & Technology ND2004, 769, Part One, 207-210, 2005.08.
||Tadahiro Kin, Fuminobu Saiho, Shinya Hohara, Katsuhiko Ikeda, Kiyohisa Ichikawa, Yusuke Yamashita, Minoru Imamura, Genichiro Wakabayashi, Nobuo Ikeda, Yusuke Uozumi, Masaru Matoba, Masahiro Nakano, Norihiko Koori, Proton production cross sections for reactions by 300- and 392-MeV protons on carbon, aluminum and niobium., Physical Review C, 10.1103/PhysRevC.72.014606, 72, 1, 014606, 2005.07.