Benchmark study of the recent version of the PHITS code

Iwamoto, Yosuke; Sato, Tatsuhiko; Hashimoto, Shintaro; Ogawa, Tatsuhiko; Furuta, Takuya; Abe, Shin‐ichiro; Kai, Takeshi; Matsuda, Norihiro; Hosoyamada, Ryuji; Niita, Koji

doi:10.1080/00223131.2017.1297742

Cited by 130 publications

(63 citation statements)

References 51 publications

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“…Firstly, the compositions and mass density of materials excluding the Freiburg Flap Applicator were accurately defined in the PHITS simulation. Iwamoto et al (2017) reported that the benchmark test result to verify the accuracy of photon and electron transport using the EGS5 mode agreed with the experimental data well except for neutrons produced by photonuclear reactions with energy range from keV to GeV. In addition, the transit dose component was canceled by the adjustment of dwell time in the microSelectron HDR-v3 remote afterloading device, so that the effect was negligible.…”

Section: Summary Of Factors Of Difference Between Measured and Calculmentioning

confidence: 56%

Verification of evaluation accuracy of absorbed dose in the dose-evaluation system for iridium-192 brachytherapy for treatment of keloids

Ohta

Nakao

Kuribayashi

et al. 2018

Biomed. Phys. Eng. Express

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Ir high-dose-rate superficial brachytherapy (HDR-SBT) has been delivered as a postoperative radiotherapy to prevent recurrence of keloids in Nippon Medical School Hospital. However, extra radiation exposure for organs at risk is a concern because high-energy gamma rays penetrate more deeply than electrons at the energies typically used for therapy. Therefore, a system which can evaluate absorbed dose in the affected area and radiation exposure to tissue and organs based on the actual geometry in HDR-SBT was developed using the PHITS Monte Carlo code and a MIRD-5 phantom in our previous work. In this study, the absorbed dose was measured in a simple geometry using a waterequivalent phantom and radio-photoluminescence glass dosimeters to verify the evaluation accuracy of absorbed dose calculated by the developed system. We find that, accounting for the transit dose component and the energy dependence analytically, the calculations by PHITS underestimate the absorbed dose by 10.2% to 19.0% (average 15.5%±1.9%) compared to the measurements. The sensitivity-correction procedure was considered to be the main reason for the difference between the measured and calculated absorbed dose of the dosimeters.

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Section: Summary Of Factors Of Difference Between Measured and Calculmentioning

confidence: 56%

Verification of evaluation accuracy of absorbed dose in the dose-evaluation system for iridium-192 brachytherapy for treatment of keloids

Ohta

Nakao

Kuribayashi

et al. 2018

Biomed. Phys. Eng. Express

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“…Owing to the continuous improvement and promotion of the code, the number of registered users exceeded 2,500 in 2016, and has been rapidly increasing since then. A comprehensive benchmark calculation results of the new version of PHITS will be published elsewhere [35]. M. Adachi, Mr. T. Miura, and Mr. A. Wada of RIST for their assistance in the programing of PHITS.…”

Section: Discussionmentioning

confidence: 99%

Recent Improvements of Particle and Heavy Ion Transport code System: PHITS

et al. 2017

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Abstract. The Particle and Heavy Ion Transport code System, PHITS, has been developed under the collaboration of several research institutes in Japan and Europe. This system can simulate the transport of most particles with energy levels up to 1 TeV (per nucleon for ion) using different nuclear reaction models and data libraries. More than 2,500 registered researchers and technicians have used this system for various applications such as accelerator design, radiation shielding and protection, medical physics, and space-and geo-sciences. This paper summarizes the physics models and functions recently implemented in PHITS, between versions 2.52 and 2.88, especially those related to source generation useful for simulating brachytherapy and internal exposures of radioisotopes.

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“…A Monte Carlo simulation code, Particle and Heavy Ion Transport System (PHITS; Iwamoto et al, 2017), was used in the simulation for validating the present shielding design. The proton-beam power of the neutron source was assumed to be 1 MW.…”

Section: Radiation Shielding Design and Validationmentioning

confidence: 99%

Instrument and shielding design of a neutron diffractometer at J-PARC for protein crystallography covering crystals with large unit-cell volume

Kurihara¹,

Hirano²,

Oikawa³

et al. 2018

J Appl Cryst

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Structural information on hydrogen atoms and hydration water molecules obtained by neutron protein crystallography is expected to contribute to the elucidation and improvement of protein function. However, many proteins, especially membrane proteins and protein complexes, have large molecular weights and the unit cells of their crystals have large volumes, which are out of the range of unit‐cell volumes measurable by conventional diffractometers because a large unit‐cell volume causes difficulty in separating Bragg peaks close to each other in the spatial and time dimensions in diffraction images. Therefore, a new diffractometer has been designed at the Japan Accelerator Research Complex (J‐PARC), which can measure crystals with a large unit‐cell volume. The proposed diffractometer uses a large camera distance (L2 = 800 mm) and more than 40 novel large‐area detectors (larger than 320 × 320 mm). In addition, a decoupled hydrogen moderator, which has a narrow pulse width, is selected as the neutron source. This diffractometer is estimated to be able to measure crystals with a lattice length of 250 Å along each axis at dmin = 2.0 Å. Ellipsoidal and curved shapes were introduced in the vertical and horizontal guide designs, respectively, providing an estimated neutron flux of 6 × 105 n s−1 mm−2 in the wavelength range 1.5–5.5 Å.

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Benchmark study of the recent version of the PHITS code

Cited by 130 publications

References 51 publications

Verification of evaluation accuracy of absorbed dose in the dose-evaluation system for iridium-192 brachytherapy for treatment of keloids

Verification of evaluation accuracy of absorbed dose in the dose-evaluation system for iridium-192 brachytherapy for treatment of keloids

Recent Improvements of Particle and Heavy Ion Transport code System: PHITS

Instrument and shielding design of a neutron diffractometer at J-PARC for protein crystallography covering crystals with large unit-cell volume

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