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Takyu, Sodai*; Matsumoto, Kenichiro*; Hirade, Tetsuya; Nishikido, Fumihiko*; Akamatsu, Go*; Tashima, Hideaki*; Takahashi, Miwako*; Yamaya, Taiga*
Japanese Journal of Applied Physics, 63(8), p.086003_1 - 086003_8, 2024/08
Times Cited Count：1 Percentile：57.87(Physics, Applied)Positrons and electrons sometimes exist as a bound state, positronium (Ps), in living organisms. The triplet Ps (ortho-Ps) annihilation time represents the ortho-Ps pick-off annihilation lifetime, and it varies depending on the surrounding electron density. The ortho-Ps lifetime may add new biological information to PET scan information. In order to discuss the feasibility of quantifying (free) radicals in vivo by the ortho-Ps lifetime, we used a clinical PET system to make ortho-Ps lifetime measurements in aqueous solutions containing radicals. The results suggested that differences in radical concentrations in aqueous solutions of the order of a few mM could be quantified by the ortho-Ps lifetime if the counting statistic of the positron annihilation events was more than 10
events. This concentration was higher than the radical concentration generated in the physiological functions of living organisms.
Watabe, Hiroshi*; Sato, Tatsuhiko; Yu, K. N.*; Zivkovic, M.*; Krstic, D.*; Nikezic, D.*; Kim, K. M.*; Yamaya, Taiga*; Kawachi, Naoki*; Tanaka, Hiroki*; et al.
Radiation Protection Dosimetry, 200(2), p.130 - 142, 2024/02
Times Cited Count：1 Percentile：31.89(Environmental Sciences)Previously, we have developed DynamicMC for modelling relative movement of ORNL phantom in a radiation field for MCNP. Using this software, 3-dimensional dose distributions in a phantom irradiated by a certain mono-energetic source can be deduced through its graphical user interface (GUI). In this study, we extended DynamicMC to be used in combination with the PHITS by providing it with a higher flexibility for dynamic movement for a less sophisticated anthropomorphic phantom. We anticipate that the present work and the developed open-source tools will be in the interest of nuclear radiation physics community for research and teaching purposes.
Kurita, Keisuke; Miyoshi, Yuta*; Nagao, Yuto*; Yamaguchi, Mitsutaka*; Suzui, Nobuo*; Yin, Y.-G.*; Ishii, Satomi*; Kawachi, Naoki*; Hidaka, Kota*; Yoshida, Eiji*; et al.
QST-M-29; QST Takasaki Annual Report 2019, P. 106, 2021/03
Shibuya, Kengo*; Koshimizu, Masanori*; Asai, Keisuke*; Muroya, Yusa*; Katsumura, Yosuke; Inadama, Naoko*; Yoshida, Eiji*; Nishikido, Fumihiko*; Yamaya, Taiga*; Murayama, Hideo*
Review of Scientific Instruments, 78(8), p.083303_1 - 083303_7, 2007/08
Times Cited Count：6 Percentile：31.28(Instruments & Instrumentation)Miyoshi, Yuta*; Kurita, Keisuke; Nagao, Yuto*; Yamaguchi, Mitsutaka*; Suzui, Nobuo*; Yin, Y.-G.*; Ishii, Satomi*; Kawachi, Naoki*; Hidaka, Kota*; Yoshida, Eiji*; et al.
no journal, ,
no abstracts in English
Miyoshi, Yuta*; Kurita, Keisuke; Nagao, Yuto*; Yamaguchi, Mitsutaka*; Suzui, Nobuo*; Yin, Y.-G.*; Ishii, Satomi*; Kawachi, Naoki*; Hidaka, Kota*; Yoshida, Eiji*; et al.
no journal, ,
no abstracts in English
Kurita, Keisuke; Miyoshi, Yuta*; Nagao, Yuto*; Yamaguchi, Mitsutaka*; Suzui, Nobuo*; Yin, Y.-G.*; Ishii, Satomi*; Kawachi, Naoki*; Hidaka, Kota*; Yoshida, Eiji*; et al.
no journal, ,
no abstracts in English
Takyu, Sodai*; Matsumoto, Kenichiro*; Hirade, Tetsuya; Nishikido, Fumihiko*; Akamatsu, Go*; Tashima, Hideaki*; Takahashi, Miwako*; Yamaya, Taiga*
no journal, ,
no abstracts in English
