Investigation the trend of different magnetic fields types on linac photon beam mode by Monte Carlo method using Geant4 toolkit

Zanganeh, V.; Khabaz, Rahim; Aghili, Fatemeh

doi:10.1016/j.radphyschem.2021.109603

Cited by 4 publications

(4 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, there exists the possibility of their unaltered transmission through the medium. To ascertain the attenuation of γ‐ray photons and neutrons in UHMWPE materials, one may employ the subsequent equation 32–34 :

I={I}_0{e}^{\left(-\mu \cdotp d\right)}

where, the I is the penetrating intensity through the UHMWPE shielding materials; I 0 is the incident intensity; μ is the linear attenuation coefficient; d is the thickness of UHMWPE shielding materials.

{\mu}_m=\mu /\rho

where, the μ m is the mass attenuation coefficient; ρ is the density of UHMWPE shielding materials.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Fabricating UHMWPE‐based shielding materials with excellent high‐temperature mechanical properties and irradiation endurance properties via controlling crosslinked and crystalline structures

Xu,

Zhou,

Sun

et al. 2023

Polymers for Advanced Techs

View full text Add to dashboard Cite

Shielding materials are important guarantees for the reliable operation of nuclear equipment and essential prerequisites for the safe application of nuclear energy. As an essential and most widely used shielding material, improving the high‐temperature mechanical properties of PE‐based shielding material is of significant importance for the lightweight and integrated design of nuclear shielding material systems. Here, a simple crosslinking method was proposed to control the crosslinking degree and crystallinity to prepare UHMWPE‐based shielding materials with excellent high‐temperature mechanical properties and irradiation endurance properties. The enhancement mechanisms of mechanical properties, irradiation endurance properties and shielding properties were revealed. Meanwhile, the γ‐rays and neutrons shielding properties were studied using Geant4. When the crosslinking degree was 20.62 × 10−3 g/mol and the crystallinity was 12.13%, UHMPE‐based shielding material with optimal overall performance was obtained. Compared with the un‐crosslinked control sample, the tensile strength and elongation at break at room temperature, 70 and 90°C were 22.3 MPa (48.90% increased) and 8.43% (154.68% increased), 8.65 MPa (105.46% increased) and 6.35% (154.00% increased), 7.48 MPa (128.75% increased) and 6.2% (89.60% increased), respectively. The vicat softening temperature and maximum thermal deformation temperature were enhance 4.20 and 6.56°C when the crosslinking degree was 27.51 × 10−3 g/mol and the crystallinity is 10.83%. Our work provided a feasible method to increase the upper temperature limit and broaden the application range of PE‐based nuclear shielding materials.

show abstract

I={I}_0{e}^{\left(-\mu \cdotp d\right)}

{\mu}_m=\mu /\rho

where, the μ m is the mass attenuation coefficient; ρ is the density of UHMWPE shielding materials.…”

Section: Methodsmentioning

confidence: 99%

“…On the other hand, there exists the possibility of their unaltered transmission through the medium. To ascertain the attenuation of γray photons and neutrons in UHMWPE materials, one may employ the subsequent equation [32][33][34] :…”

Section: Shielding Performancementioning

confidence: 99%

Fabricating UHMWPE‐based shielding materials with excellent high‐temperature mechanical properties and irradiation endurance properties via controlling crosslinked and crystalline structures

Xu,

Zhou,

Sun

et al. 2023

Polymers for Advanced Techs

View full text Add to dashboard Cite

show abstract

“…In the accelerator, electron beams collide with a target (such as tungsten) and produce x-rays. The use of x-ray machines necessitates radiation protection [1,2].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of neutron spectra and different fluences inside a radiotherapy room with a modified simple geometry of LINAC head

As-habi¹,

Khabaz²,

Khoshbin-khoshnazar³

2022

Phys. Scr.

Self Cite

View full text Add to dashboard Cite

The photoneutron spectra and ambient dose equivalent were determined in a radiotherapy room with a 15 MV linear accelerator using Monte Carlo simulation. A modified simple geometry of the accelerator's head was modeled by different simulations. Then, by putting it in a radiotherapy room, the photoneutron spectra at different distances from the isocenter and in the maze were determined. The source term spectrum is due to evaporation, and knock-on neutrons. In the presence of the walls, as the distance from isocenter is increased, evaporation and knock-on neutrons are reduced; however, epithermal and thermal neutrons tend to remain constant. The walls also play an influential role in increasing the photoneutron ambient dose equivalent. Subsequently, by placing this modified accelerator's head in the radiotherapy room, the coefficients of scattered and thermal fluences were also estimated.

show abstract

“…Electron therapy is one of the most popular methods in treatment planning [21][22][23][24][25]. During radiation therapy of patients with electron beams, some of the electrons are backscattered due to the interaction of electrons with the shield and the patient's body, so the dose of electrons backscattered to the tissue should also be taken into account.…”

Section: Introductionmentioning

confidence: 99%

Study of the backscattering of electron beams with energies typical of radiotherapy

Koohi¹,

Khabaz²

2022

Phys. Scr.

Self Cite

View full text Add to dashboard Cite

During radiotherapy, the dose of electrons backscattered into the tissue should be taken into account. According to the available data on the electron backscattering phenomenon, the backscatter rate varies depending on the specific radiotherapy delivery configuration. Using the Monte Carlo code MCNPX, the backscattering distribution and their saturation values for electron beams with energies between 4 MeV and 25 MeV (the energies used in electron therapy) of various materials such as polystyrene, aluminum, copper and lead were obtained. Data obtained with MCNPX show that the probability of electron backscattering is strongly dependent on the effective atomic number and the energy of the electron. For low energy electrons, the backscattering probability depends less on the energy and is mainly a function of the effective atomic number of the backscatter material. The saturation values of the backscattering are distributed as a linear function of the effective atomic number of the scattering material for all investigated energies. Therefore, it is recommended that equipment and accessories used with patients in electron radiotherapy LINAC be materials with low atomic numbers (Z), and that a layer of low Z material be used over a higher Z material for protection.

show abstract

Investigation the trend of different magnetic fields types on linac photon beam mode by Monte Carlo method using Geant4 toolkit

Cited by 4 publications

References 15 publications

Fabricating UHMWPE‐based shielding materials with excellent high‐temperature mechanical properties and irradiation endurance properties via controlling crosslinked and crystalline structures

Fabricating UHMWPE‐based shielding materials with excellent high‐temperature mechanical properties and irradiation endurance properties via controlling crosslinked and crystalline structures

Evaluation of neutron spectra and different fluences inside a radiotherapy room with a modified simple geometry of LINAC head

Study of the backscattering of electron beams with energies typical of radiotherapy

Contact Info

Product

Resources

About