Estimation of dose and light distributions in water during irradiation of muon beams

Hirano, Yoshiyuki; Ninomiya, Kazuhiko; Yamamoto, Seiichi

doi:10.1088/1402-4896/ab3acb

Cited by 6 publications

(11 citation statements)

References 33 publications

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“…This is because the energies of the positrons produced by the decay of the positive muons were high (maximum energy: 52.32 MeV) and the ranges of the positrons in water were longer; thus, the widths of the optical images in water were wider than those of the muon beams. This is consistent with the Monte Carlo simulation results of the Cherenkov-light distribution emitted from the positrons in water 30 .…”

Section: Discussionsupporting

confidence: 91%

“…This is due to the scatter of the muon beams in the plastic scintillator block. The same phenomenon was more clearly observed in the dose distributions of the muon beams by Monte Carlo simulation for pencil beams 30 . However this is an advantage when the muon beams will be used for mini-beam therapy because the beams need to be wider in Bragg peak area to obtain the flat distributions in the mini-beam therapy 35,36 .…”

Section: Discussionsupporting

confidence: 74%

“…As the light production from the luminescence of water at lower energy than the Cerenkov-light threshold [8][9][10][11][12][13] , we used the scintillation process. These were the same procedures as we conducted the simulation for positive muons 30 .…”

Section: Image Evaluationmentioning

confidence: 99%

“…The side of the black box was made of thin black paper to minimize energy loss of the muon beam by the black box. We used the water phantom to image the Cherenkov-light of the positrons produced by the decay of muons 30 .…”

mentioning

confidence: 99%

“…We also used a 10 cm × 10 cm × 10 cm plastic scintillator block (EJ-200, Eljen Technology, USA) for the muon imaging. Since the plastic scintillator block emits higher light than the Cherenkov-light by the positrons produced by the muons' decay, we expected to image the dose distributions of the muons using the plastic scintillator block 30 .…”

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confidence: 99%

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Optical imaging of muons

Yamamoto

Ninomiya

Kawamura

et al. 2020

Sci Rep

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Optical imaging of particle beams is a promising method for range and width estimations. However it was not clear that optical imaging was possible for muons. To clarify this, we conducted optical imaging of muons, since high-intensity muons are now available at J-PARC. We irradiated positive muons with different momenta to water or plastic scintillator block, and imaged using a charge-coupled device (CCD) camera during irradiation. The water and plastic scintillator block produced quite different images. The images of water during irradiation of muons produced elliptical shape light distribution at the end of the ranges due to Cherenkov-light from the positrons produced by positive muon decay, while, for the plastic scintillator block, we measured images similar to the dose distributions. We were able to estimate the ranges of muons as well as the measurement of the asymmetry of the direction of the positron emission by the muon decays from the optical images of the water, although the measured ranges were 4 mm to 5 mm larger than the calculated values. The ranges and widths of the beams could also be estimated from the optical images of the plastic scintillator block. We confirmed that optical imaging of muons was possible and is a promising method for the quality assessment, research of muons, and the future muon radiotherapy.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 74%

Section: Image Evaluationmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Optical imaging of muons

Yamamoto

Ninomiya

Kawamura

et al. 2020

Sci Rep

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Three-dimensional (3D) optical imaging of muon beam using a plastic scintillator plate in water

Yamamoto

Ninomiya

Kawamura

et al. 2021

Nuclear Instruments and Methods in Physics Research Section A:

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Position distribution calculation of annihilation radiations and bremsstrahlung x rays in water during irradiation of positive muons: a Monte Carlo simulation study

Hirano¹,

Yamamoto²,

Kawamura³

et al. 2020

Phys. Scr.

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Range, momentum and deviation of momentum determinations of muons are important for quality assessment (QA) of beams. Imaging of annihilation radiations emitted from positrons decayed from positive muons and that of bremsstrahlung x-rays emitted from positrons and secondary electrons from positive muons are possible methods of imaging muons. However, the energies and intensities as well as position distributions of these radiations have not been obvious. Thus we calculated the energy spectrum and the distributions of annihilation radiations as well as bremsstrahlung x-rays produced in water during irradiation of positive muons using Monte Carlo simulation. The calculations were conducted for 84.5 MeV /c positive muons, which is the same beam condition used in an experimental facility at the Japan Proton Accelerator Research Complex (J-PARC). We were able to calculate the energy spectrum as well as the position distributions of annihilation radiations and bremsstrahlung x-rays. The energy spectrum showed a broad distribution of bremsstrahlung x-rays, mainly from decayed positrons with an energy range up to 50 MeV with higher intensity in low-energy bremsstrahlung x-rays. The spectrum also showed a sharp peak at 511-keV from annihilation radiations. The position distribution of annihilation radiations was wider than those of the bremsstrahlung x-rays. The position distribution of the bremsstrahlung x-rays were nearly identical to the Cerenkov-light position distribution emitted by the decayed positrons in water. We conclude that imaging of bremsstrahlung x-rays from decayed positrons by using an x-ray camera is a promising method for the QA of positive muons and that higher spatial resolution images of positron distributions will be measured than those measured by annihilation radiations.

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Estimation of dose and light distributions in water during irradiation of muon beams

Cited by 6 publications

References 33 publications

Optical imaging of muons

Optical imaging of muons

Three-dimensional (3D) optical imaging of muon beam using a plastic scintillator plate in water

Position distribution calculation of annihilation radiations and bremsstrahlung x rays in water during irradiation of positive muons: a Monte Carlo simulation study

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