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Fujibuchi, Toshioh,Ogino, Haruyuki,Taek, Han Ki,Tani, Kotaro,Emes, Daniel The Korean Association for Radiation Protection 2021 방사선방어학회지 Vol.46 No.2
Dr. Haruyuki Ogino, a member of the Japan Health Physics Society (JHPS), was awarded the 2021 Bo Lindell Medal by the International Commission on Radiological Protection (ICRP). To commemorate this, the "Joint JHPS-KARP-ARPS program for young radiation protection (RP) scientists to discuss the future of RP" was organized via a web meeting system. First, Dr. Ogino gave a lecture, and then young researchers selected from each academic society made presentations on the future of RP. After the presentations by the three researchers, a free talk was held-young researcher groups of each country being active is a great opportunity to collaborate and exchange information. It was emphasized that the low awareness of knowledge related to radiation has been common to all of the participating countries. Thus, it is necessary to utilize communication via web technology, as done for this program, effectively. One of the biggest advantages for Asia and Oceania is that we do not have a significant time difference. The round-table discussion was concluded by expressing the hope of active exchange and development of young researchers in the future.
Ogino, Hirokazu,Minamitani, Haruyuki,Souma, Takeshi 경북대학교 센서기술연구소 1994 센서技術學術大會論文集 Vol.5 No.1
Pulse oximeter is a noninvasive equipment for monitoring of arterial oxygen saturation (SaO_(2)), and commonly utilize a transmittance sensor on peripheral locations of the body. In this study, A new reflectance pulse oximeter sensor (RPS) was developed as a part of the multi sensor system which intends to monitor physiological data from mouth. The RPS consists of a photodiode (PD) and two light emitting diodes (LEDs) of which wavelengths are 660 and 940nm. Elastic gum optical shield (GOS) and reflectance optical shield (ROS) were also used to improve stability and signal-to-noise (S/N) ratio of the sensor. The RPS was evaluated by breath holding experiment, and it showed good correlation with SaO_(2) measured from ear-lobe by using conventional transmittance sensor. The result indicates that the RPS is available to measure SaO_(2) from mouth and can use for monitoring of physical condition.
Mitsuru UESAKA,Atsushi FUKASAWA,Fumito SAKAMOTO,Haruyuki OGINO,Junji URAKAWA,Katsuhiro DOBASHI,Kazutaka TAKAO,Mitsuo AKEMOTO,Tomohiko YAMAMOTO,Toshinobu MIYOSHI,Toshiyasu HIGO 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.1
A Compton scattering X-ray source consisting of an X-band (11.424 GHz) electron linear accelerator (linac) and Q-switched Nd:YAG laser is currently under construction. Monochromatic hard X-rays are required for a variety of medical and biological applications. The new hard X-ray source produces monochromatic X-rays via collision between a 35-MeV multi-bunch (104 bunches in a 1 μs RF pulse) electron beam and 1.4 J/10 ns (532 nm) Nd:YAG laser beam. The linac uses an X-band 3.5-cell thermionic cathode RF gun and an alpha magnet as an injector. The thermionic cathode RF gun is the first of its kind and can generate a high current (2 μA) and a multi-bunch 2-MeV electron beam. To increase the efficiency of the X-ray yield, a laser pulse circulation system is adopted, that can increase the X-ray intensity by up to 50 times. This scheme can produce monochromatic tunable X-rays (10 40 keV) with intensities of 108 109 photons/sec. In addition, the X-ray energy can be changed rapidly over 40 ms by two different wavelength lasers (YAG fundamental (1064 nm), 2nd harmonic (532 nm)) and an optical switch. This quick energy change is very important for living specimens and is very difficult to achieve in light sources such as a large SR (Synchrotron Radiation) source. The system can be used for dual-energy X-ray CT and subtraction X-ray CT to determine the 3D distribution of the atomic number density and electron density, and specified atomic distribution, respectively. In this paper, we describe the details of the system, report on experiments on the X-band thermionic cathode RF gun, and discuss applications of monochromatic X-rays.?