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Journal Articles

Simulation study on unfolding methods for diagnostic X-rays and mixed $$gamma$$ rays

Hashimoto, Makoto; Otaka, Masahiko; Ara, Kuniaki; Kanno, Ikuo; Imamura, Ryo*; Mikami, Kenta*; Nomiya, Seiichiro*; Onabe, Hideaki*

Journal of Nuclear Science and Technology, 46(1), p.76 - 82, 2009/01

 Times Cited Count:0 Percentile:0.01(Nuclear Science & Technology)

A photon detector for unfolding X-ray energy distribution has been previously reported. Simulation studies on the unfolding method for this detector are discussed for diagnostic X-rays and mixed-source $$gamma$$ rays of $$^{137}$$Cs/$$^{60}$$Co. Response functions for diverse diagnostic X-rays are almost indistinguishable and an unfolding using error reduction method is not sufficiently worked. The spectrum surveillance method is effective in this case. However, a simple error reduction method is useful for mixed $$gamma$$ rays. For both techniques, the neural network method is promising.

Oral presentation

Beam hardening free CT measurement method, 3; Feasibility study on current mode detector

Kanno, Ikuo*; Uesaka, Akio*; Otaka, Masahiko; Hashimoto, Makoto; Ara, Kuniaki; Nomiya, Seiichiro*; Onabe, Hideaki*

no journal, , 

The beam hardening free CT imaging, which is not effected with the size of speciman, was obtained with the energy and the energy differential of X-rays. However, measurement of X-ray energy in high density as in CT is hard. To solve this problem, current mode X-ray detector (CMD) was designed. CMD is configured with several detective elements aligned with X-ray fluence, and read the current from each detective element. Relatively low energy photon is mainly absorbed in front detective elements of CMD and high energy photon can reach to deep, rough X-ray spectrum can be expected with current from each element. The ability of CMD is examined by simulation. Current from each element with particular X-ray field was calculated. To evaluate the X-ray spectrum expectation from current readout are evaluated with two ways, one is using response matrix solution, and the other is unfolding with SAND-II. It looks represent the iodine effective thickness.

Oral presentation

X-ray measurement and energy estimation with current mode detector

Hashimoto, Makoto; Mikami, Kenta*; Uesaka, Akio*; Kanno, Ikuo; Otaka, Masahiko; Ara, Kuniaki; Nomiya, Seiichiro*; Onabe, Hideaki*

no journal, , 

X-ray energy spectrum measurement in a short time is necessary for CT picture measurement with energy difference method. For this purpose, current mode detector, which is applied X-ray detectors used with current mode and can obtain rough X-ray energy spectrum, is examined. X-ray detector array is used as the electric current mode detector and unfolding of output of the detector to energy spectrum is studied. Furthermore, optimized detector array constitution is also discussed.

Oral presentation

An archaeological analog for long-term interaction between iron and glass

Mitsui, Seiichiro; Yoshikawa, Hideki; Matsui, Toshiya*; Kaneko, Makoto*; Nakamatsu, Yuki*; Utsunomiya, Satoshi*

no journal, , 

Engineered barrier system for geological disposal of high level nuclear waste in Japan consists of vitrified waste, metal overpack and clay buffer material. Although the overpack and the buffer material are designed to prevent the release of radionuclides from the vitrified waste, some experimental studies have shown that these components can promote glass dissolution. To gain insight in the long-term behavior of the vitrified waste at the glass-iron interface in the geological repository conditions, we studied sand contacted with iron cannon retrieved from Kaiyo Maru, a warship of the Tokugawa Shogunate that sank off the coast of Esashi in Hokkaido, 1868, as an archaeological analog. In this paper, we discuss type of corrosion and alteration products characterized by microanalyses, such as transmission electron microscope, and clogging of sand voids analyzed by a micro-focus X-ray computed tomography.

Oral presentation

Muonic X-ray analysis for Ryugu samples

Osawa, Takahito; Ninomiya, Kazuhiko*; Nakamura, Tomoki*; Takahashi, Tadayuki*; Terada, Kentaro*; Yurimoto, Hisayoshi*; Noguchi, Takaaki*; Okazaki, Ryuji*; Yabuta, Hikaru*; Naraoka, Hiroshi*; et al.

no journal, , 

I report on the muonic X-ray analysis experiment conducted at J-PARC from 2020 to 2021, in which the analytical method was significantly developed through four preliminary experiments and successfully analyzed samples from the asteroid Ryugyu in July 2021. The experimental process is described from a radiochemical point of view.

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