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Neutron Energy Spectra at 180˚ from 140 MeV Proton Incident Reactions
Yosuke Iwamoto,Daiki Satoh,Yoshihiro Nakane,Hiroshi Nakashima,Akira Endo,Yukio Sakamoto 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The neutron energy spectra of carbon, iron, and gold targets with 140 MeV protons at 180˚ were measured at the RCNP cyclotron facility using the time-of-flight technique. The results were compared with results calculated using the evaluated nuclear data file (the LA150 library) and the intranuclear cascade models (JAM and JQMD) implemented in the PHITS code. The results using LA150 and JQMD generally agreed with the experimental data except for the carbon target, but the JAM could not reproduce high-energy neutrons above .
SUMRAY: R and Python Codes for Calculating Cancer Risk Due to Radiation Exposure of a Population
Sasaki Michiya,Furukawa Kyoji,Satoh Daiki,Shimada Kazumasa,Kudo Shin’ichi,Takagi Shunji,Takahara Shogo,Kai Michiaki 대한방사선방어학회 2023 방사선방어학회지 Vol.48 No.2
Background : Quantitative risk assessments should be accompanied by uncertainty analyses of the risk models employed in the calculations . In this study, we aim to develop a computational code named SUMRAY for use in cancer risk projections from radiation exposure taking into ac- count uncertainties . We also aim to make SUMRAY publicly available as a resource for further improvement of risk projection . Materials and Methods : SUMRAY has two versions of code written in R and Python . The risk models used in SUMRAY for all-solid-cancer mortality and incidence were those published in the Life Span Study of a cohort of the atomic bomb survivors in Hiroshima and Nagasaki . The confidence intervals associated with the evaluated risks were derived by propagating the statisti- cal uncertainties in the risk model parameter estimates by the Monte Carlo method . JRPR Results and Discussion : SUMRAY was used to calculate the lifetime or time-integrated attrib- utable risks of cancer under an exposure scenario (baseline rates , dose[s] , age[s] at exposure , age at the end of follow-up, sex) specified by the user. The results were compared with those calculated using another well-known web-based tool , Radiation Risk Assessment Tool (Rad- RAT; National Institutes of Health) , and showed a reasonable agreement within the estimated confidential interval . Compared with RadRAT, SUMRAY can be used for a wide range of ap- plications , as it allows the risk projection with arbitrarily specified risk models and/or popula- tion reference data . Conclusion : The reliabilities of SUMRAY with the present risk-model parameters and their variance-covariance matrices were verified by comparing them with those of the other codes . The SUMRAY code is distributed to the public as an open-source code under the Massachusetts Institute of Technology license .
Itashiki, Yutaro,Imahayashi, Youichi,Shigyo, Nobuhiro,Uozumi, Yusuke,Satoh, Daiki,Kajimoto, Tsuyoshi,Sanami, Toshiya,Koba, Yusuke,Matsufuji, Naruhiro The Korean Association for Radiation Protection 2016 방사선방어학회지 Vol.41 No.4
Background: Carbon ion therapy has achieved satisfactory results. However, patients have a risk to get a secondary cancer. In order to estimate the risk, it is essential to understand particle transportation and nuclear reactions in the patient's body. The particle transport Monte Carlo simulation code is a useful tool to understand them. Since the code validation for heavy ion incident reactions is not enough, the experimental data of the elementary reaction processes are needed. Materials and Methods: We measured neutron production double-differential cross-sections (DDXs) on a carbon bombarded with 430 MeV/nucleon carbon beam at PH2 beam line of HIMAC facility in NIRS. Neutrons produced in the target were measured with NE213 liquid organic scintillators located at six angles of 15, 30, 45, 60, 75, and $90^{\circ}$. Results and Discussion: Neutron production double-differential cross-sections for carbon bombarded with 430 MeV/nucleon carbon ions were measured by the time-of-flight method with NE213 liquid organic scintillators at six angles of 15, 30, 45, 60, 75, and $90^{\circ}$. The cross sections were obtained from 1 MeV to several hundred MeV. The experimental data were compared with calculated results obtained by Monte Carlo simulation codes PHITS, Geant4, and FLUKA. Conclusion: PHITS was able to reproduce neutron production for elementary processes of carbon-carbon reaction precisely the best of three codes.
THE VLBI MONITORING PROJECT FOR 6.7 GHz METHANOL MASERS USING THE JVN/EAVN
SUGIYAMA, KOICHIRO,FUJISAWA, KENTA,HACHISUKA, KAZUYA,YONEKURA, YOSHINORI,MOTOGI, KAZUHITO,SAWADA-SATOH, SATOKO,MATSUMOTO, NAOKO,SAITO, YU,HIRANO, DAIKI,HAYASHI, KYONOSUKE,SHEN, ZHIQIANG,HONMA, MAREKI The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
We have initiated a Very Long Baseline Interferometer (VLBI) monitoring project of 36 methanol maser sources at 6.7 GHz using the Japanese VLBI Network (JVN) and East-Asian VLBI Network (EAVN), starting in August 2010. The purpose of this project is to systematically reveal 3-dimensional (3-D) kine-matics of rotating disks around forming high-mass protostars. As an initial result, we present proper mo- tion detections for two methanol maser sources showing an elliptical spatial morphology, G 002.53+00.19 and G 006.79-00.25, which could be the best candidates associated with the disk. The detected proper motions indicate a simple rotation in G 002.53+00.19 and rotation with expansion in G 006.79-00.25, respectively, on the basis of disk model fits with rotating and expanding components. The expanding motions might be caused by the magnetic-centrifugal wind on the disk.