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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.?
Σ-nucleus potential studied with the(π−,K+)reaction on medium-to-heavy nuclear targets
Saha, P. K.,Noumi, H.,Abe, D.,Ajimura, S.,Aoki, K.,Bhang, H. C.,Dobashi, K.,Endo, T.,Fujii, Y.,Fukuda, T.,Guo, H. C.,Hashimoto, O.,Hotchi, H.,Imai, K.,Kim, E. H.,Kim, J. H.,Kishimoto, T.,Krutenkova, A American Physical Society 2004 PHYSICAL REVIEW C - Vol.70 No.4
Katsuya Mitamura,Takashi Norikane,Yuka Yamamoto,Kengo Fujimoto,Yasukage Takami,Mikiya Kato,Tomohiro Kameda,Hiroaki Dobashi,Yoshihiro Nishiyama 대한핵의학회 2021 핵의학 분자영상 Vol.55 No.1
We present a female in her sixties with mixed connective tissue disease who underwent 99mTc-human serum albumin diethylenetriaminepentaacetic acid (99mTc-HSA-DTPA) scintigraphy to clarify the cause of generalized edema. Scintigraphy findings directed the diagnosis to protein-losing gastroenteropathy. Various disorders are known to be associated with proteinlosing gastroenteropathy; however, mixed connective tissue disease is a rare cause. 99mTc-HSA-DTPA scintigraphy is helpful in the diagnosis and following the response to therapy of protein-losing gastroenteropathy.