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Journal Articles

Medical applications of the PHITS code, 3; User assistance program for medical physics computation

Furuta, Takuya; Hashimoto, Shintaro; Sato, Tatsuhiko

Igaku Butsuri, 36(1), p.50 - 54, 2016/00

An application of Particle and Heavy Ion Transport Code System; PHITS, for medical physics is to simulate treatment planning of radiation therapy. Treatment planning simulation is conducted by constructing patient geometry from patient CT data, calculating radiation transport of external beam, and deducing dose distribution inside patient body. However, it is not easy to extract information such as patient location and CT value distribution from patient CT data or to construct complex accelerator geometry in PHITS format. Therefore, we developed two user assistance programs, DICOM2PHITS and PSFC4PHITS. DICOM2PHITS is a program to construct the voxel PHITS simulation geometry from patient CT DICOM image data. PSFC4PHITS is a program to convert the IAEA phase-space file data to PHITS format to be used as simulation source of PHITS. We explain these two programs by showing some applications in this article.

JAEA Reports

Guideline of Monte Carlo calculation; Neutron/$$gamma$$ ray transport simulation by Monte Carlo method

Nuclear Code Evaluation Special Committee of Nuclear Code Research Committee

JAERI-Review 2002-004, 401 Pages, 2002/03

JAERI-Review-2002-004.pdf:16.2MB

no abstracts in English

Journal Articles

Monte Carlo calculations on vector supercomputers using GMVP

Nakakawa, Masayuki; Mori, Takamasa; *

Prog. Nucl. Energy, 24, p.183 - 193, 1991/00

 Times Cited Count:7 Percentile:37.21

no abstracts in English

Oral presentation

Contribution of isobaric analog resonance to (p,n) spectra at intermediate energies

Hashimoto, Shintaro; Sato, Tatsuhiko; Niita, Koji*

no journal, , 

Particle transport simulation codes such as PHITS have been used for calculation of radiation shielding in accelerator facilities. In PHITS, INCL describes proton-induced nuclear reactions at intermediate energies of several 100 MeV. Calculated results by the models can reproduce the neutron spectra very well. However, it was pointed out that the calculated results at forward angles underestimate the experimental data in the neutron spectra of lower energies than incident energies by several 10 MeV. In this study, we developed a resonance cross section model considering Isobaric Analog and Gamow Teller resonances on the basis of Evaluated Nuclear Structure Data File (ENSDF). By summing up the result of the model and that of INCL, PHITS can reproduce the experimental data of the proton-induced reaction on Lead targets very well. It is expected that PHITS with the new model gives high accurate results in the calculation of the radiation shielding.

Oral presentation

Applications of the methods used for nuclear reactor design to technology development for decommissioning of the Fukushima Daiichi Nuclear Power Station

Okumura, Keisuke

no journal, , 

As a part of human resource development for the decommissioning of the Fukushima Daiichi Nuclear Power Station(1F), I will give a lecture on the following contents to researchers who mainly specialize in reactor physics; (1) Activities of Collaborative Laboratories for Advanced Decommissioning Science (CLADS), (2) Activation calculation method for decommissioning of nuclear reactor, (3) Development of the method to predict dose rate distribution in 1F plant, (4) Simulation of the germanium detector, (5) Development of Non-Destructive Assay (NDA) technology for nuclear material accountancy of fuel debris canister by Monte Carlo simulation.

Oral presentation

Estimation of systematic uncertainties in PHITS results by ANOVA

Hashimoto, Shintaro; Sato, Tatsuhiko

no journal, , 

no abstracts in English

Oral presentation

Improvement of intra-nuclear cascade model implemented in PHITS using momentum distribution based on one-particle wave functions

Hashimoto, Shintaro; Sato, Tatsuhiko

no journal, , 

Intra-nuclear cascade model INCL implemented in PHITS can describe various processes occurred by proton-induced reactions at energies of between 10MeV and several GeV. However, INCL overestimate experimental data of proton-knockout reactions. It was pointed out that description of momentum distribution of protons at target surfaces in INCL causes the overestimation. In this study, we improved the momentum distribution by using results of Fourier transformation of simple-particle wave functions. We changed only the component of nucleons in the outer core. In the default INCL, the distribution of surface nucleons has a large component in the high-momentum region. On the other hand, introducing the single-particle model decreases the high-momentum component and suppresses the knockout reaction. By this improvement, INCL can reproduce the data very well. It is expected that PHITS with the improved model gives accurate results of the knockout reaction.

Oral presentation

Estimation of systematic uncertainty in PHITS using bootstrap method

Hashimoto, Shintaro; Sato, Tatsuhiko

no journal, , 

Particle transport simulation code PHITS has been successfully applied to shielding calculations in accelerator facilities. We developed a function to estimate reliability of PHITS results as systematic uncertainty based on ANOVA (analysis of variance), where it is assumed that the results show a normal distribution. In this study, we applied the bootstrap method to analysis of non-normal distribution, which is rarely caused when uncertainty of nuclear reaction models has the biased distribution. The confidence interval estimated by the bootstrap method was more appropriate than that obtained by the assumption of the normal distribution for use as an indicator of the reliability of a PHITS result in a neutron shielding calculation. However, the interval by the bootstrap method was narrow compared to the distribution of the original result.

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