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Hara, Kaoru*; Fujii, Nobuya*; Kamiyama, Takashi*; Narita, Yuki*; Sato, Hirotaka*; Katabuchi, Tatsuya*; Iwamoto, Nobuyuki; Nakamura, Shoji; Toh, Yosuke
no journal, ,
no abstracts in English
Furuta, Takuya
no journal, ,
It was difficult to construct complex three-dimensional (3D) geometries with original version of PHITS because 3D geometries in PHITS are defined by combinations of objects enclosed by simple surfaces planes, spheres, cylinders and so on. Useful software to construct 3D geometries interactively exists on the market and there are many requests from users to use such softwares in PHITS. We thus introduce a function to treat tetrahedral-mesh geometries, which is a type of polygon-mesh geometries, in PHITS. Being one of the simplest, the tetrahedral-mesh geometry is sufficiently flexible to construct complex geometries. Designing with CAD software is also possible with format conversions. In addition, we have introduced a function to create decomposition maps of tetrahedral-mesh objects at the initial process so that the computational time for transport process can be reduced. Owing to this function, transport calculation in tetrahedral-mesh geometry can be as fast as that for the geometry in voxel-mesh with the same number of meshes.
Kai, Takeshi; Sato, Tatsuhiko
no journal, ,
When applying a general purpose particle transport simulation code such as PHITS to the study of biological body influence by radiation exposure, it is important to evaluate energy deposition (dose) for organ size, and to simulate precisely radiation interaction in DNA size (nanoscale) because low energy secondary electrons, which become an importance for chemical reaction process after energy deposition, have been included some unknown factors. To clear the problem, we developed track structure simulation mode to make behavior calculation of the low energy electron in arbitrary 3-D systems and various materials possible. Various application studies involved in microscopic radiation interaction such as DNA damage simulations will be expected using this simulation mode implemented below PHITS ver.2.93.
Toigawa, Tomohiro; Tsubata, Yasuhiro; Kai, Takeshi; Kimura, Takahiro; Ban, Yasutoshi; Suzuki, Hideya; Tsutsui, Nao; Hotoku, Shinobu; Matsumura, Tatsuro
no journal, ,
To evaluate the radiation Stability of the extraction agent applied to the solvent extraction process, energy transfer process to extraction solvent was estimated by using a Monte Carlo Particle and Heavy Ion Transport code System, PHITS. Our results suggest that low LET radiation will be dominant influence on absorbed dose. It was demonstrated the degradation yields of the extractant could be evaluated by reference to the experimentally obtained G-values.