Estimation of photoneutron dosimetric characteristics in tissues/organs using an improved simple model of linac head

Khabaz, Rahim; Boodaghi, Roya; Benam, M. R.; Zanganeh, V.

doi:10.1016/j.apradiso.2017.12.023

Cited by 32 publications

(14 citation statements)

References 14 publications

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“…[1][2][3][4][5][6][7][8][9][10] Obviously, this requires radiation protection, and consequently, the use of the shielding materials increases due to the raising the risks of radiation on human health and the environment. However, numerous studies were carried out about shielding qualities of different materials such as concrete, lead-based materials, and glasses, and also polymers, [6, the toxicity and high emission of the greenhouse gases of the lead, and concrete respectively restricted the uses of these traditional shielding materials. [12,23,28,46] So, new research studies focus on the shielding characteristics of polymer-based composites due to their positive aspects in comparison with the other shielding materials.…”

Section: Introductionmentioning

confidence: 99%

“…With the rapid development of technology, the utilization of radiation increased sharply and thus its measurement and hazardous effect were studied. [1][2][3][4][5][6][7][8][9][10] Obviously, this requires radiation protection, and consequently, the use of the shielding materials increases due to the raising the risks of radiation on human health and the environment. However, numerous studies were carried out about shielding qualities of different materials such as concrete, lead-based materials, and glasses, and also polymers, [6, the toxicity and high emission of the greenhouse gases of the lead, and concrete respectively restricted the uses of these traditional shielding materials.…”

Section: Introductionmentioning

confidence: 99%

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Monte Carlo simulations study on gamma ray–neutron shielding characteristics for vinyl ester composites

et al. 2021

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The current study aims to report the gamma ray-neutron attenuation parameters of eight types of vinyl ester pumice (V-P) composites for wide energy ranges of 511-2140 keV via MCNPX and FLUKA codes. The radiation shielding properties of these composites were presented graphically and are discussed in detail in this study. From the obtained results, it can be concluded that the MCNPX and FLUKA outcomes are in agreement with each other, and also the FLUKA code can be used as an alternative technique to determine the attenuation features of vinyl ester composites. Besides, the linear attenuation coefficient and total macroscopic cross sections' ( P t ) dependencies on the density and also mass attenuation coefficient were found for all selected samples. To sum up, findings show that composite coded as V-P50 can be a good competitive candidate in terms of gamma rays and neutron shielding.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Monte Carlo simulations study on gamma ray–neutron shielding characteristics for vinyl ester composites

et al. 2021

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“…Although there are many methods used for cancer treatment, the method of radiotherapy utilizing photons and electrons is the most commonly used technique [1]. Electron energies from 6 MeV to 25 MeV can be generated in Linear accelerator (Linac) devices, which have been used in radiotherapy [2,3]. Because tungsten is a good material used to reduce the energy of photons, the important components of Linac consist of tungsten.…”

Section: Introductionmentioning

confidence: 99%

“…Although the use of high-energy photons is a good method for cancer treatment, it has a downside. During the radiotherapy treatment applied to the patient, some nuclear reactions that can generate neutrons occur in the Linac room due to the high energy radiation obtained in the Linac devices [2,4,5,6]. The photon energy directly affects neutron production [4].…”

Section: Introductionmentioning

confidence: 99%

“…Photoneutron, known as a knock-on neutron, occurs when the photon gives all of its energy to a single neutron. In addition, this neutron spreads mainly in the direction of the incoming photon [2,6,21]. Photoneutrons produced by nuclear reactions as a result of the use of Linac is roughly 100 to 200 times larger than electron-neutron production, so studies have focused on photoneutrons [6,8,19].…”

Section: Introductionmentioning

confidence: 99%

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Estimation of Neutrons Occurring in the Linac Room at Different Photon Energies

Tuğrul

2021

Middle East Journal of Science

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The high-energy photons produced by the Linear accelerator (Linac) induce some nuclear reactions in the materials in the Linac room and Linac head. Neutrons formed as a result of the interaction of photons with materials are called photoneutrons. The aim of the study is to examine the neutron doses formed in the environment for 6 different photon energies. In the study, the components in the Linac head and the Linac chamber are modeled with the help of the Monte Carlo N-Particle (MCNP) program. Then, the flux and dose of photoneutrons formed at 8 different points as a result of 6 different photon energies obtained from the Linac head were measured. as can be seen from the results, as the photon energy used in the Linac increases, the resulting dose, and flux of photoneutron increase. It can be understood from the results that the amount of neutron dose to be received by the organs in the treatment field may be higher than the other organs. Especially in the treatments where the patient is lying in the prone position, there may be a possibility of neutrons reaching the patient spinal cord. Since photoneutrons with high radiobiological ability may pose a risk of secondary cancer for patients, the photon energy chosen for patient treatments should be chosen appropriately and the use of unnecessary high photon energy should be avoided.

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The influence of Nd₂O₃ on the radiation shielding, physical, mechanical, and acoustic properties of the (75 − x)TeO₂–15MgO–10Na₂O–xNd₂O₃ glasses as a potent radiation shielding material

Malidarre

Akkurt

2022

Polymer Composites

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Understanding the influence of rare-earth ions in tellurite-rich glass is vital for developing the technology. With this motivation, the present study analyzes the radiation shielding, physical, structural, mechanical, and acoustic features of the tellurite glasses added Nd 2 O 3 rare earth material. Five different glasses coded as TMNd0.0-TMNd1.9 are simulated via MCNPX Monte Carlo code by varying the concentration of neodymium oxide (Nd 2 O 3 ) and the related characteristics are evaluated between 0.01 and 10 MeV. The obtained results reveal that Nd 2 O 3 has a favorable influence on the radiation shielding characteristics of the preferred glass sample. To assess the relation between Nd 2 O 3 concentration in tellurite glass and corresponding structural and mechanical changes in candidate glasses, Makishima-Mackenzie theory is applied and mechanical moduli are extracted. The structure and dimensionality of the preferred samples are derived based on the Bergman and Kantor model for fluid and compositions with the help of the fractal bond connectivity. In addition, the longitudinal velocity (V L ), transverse velocity (V S ), mean velocity (V mean ), and acoustic impedance (Z i ) related to the TMNd glasses are evaluated.

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Estimation of photoneutron dosimetric characteristics in tissues/organs using an improved simple model of linac head

Cited by 32 publications

References 14 publications

Monte Carlo simulations study on gamma ray–neutron shielding characteristics for vinyl ester composites

Monte Carlo simulations study on gamma ray–neutron shielding characteristics for vinyl ester composites

Estimation of Neutrons Occurring in the Linac Room at Different Photon Energies

The influence of Nd₂O₃ on the radiation shielding, physical, mechanical, and acoustic properties of the (75 − x)TeO₂–15MgO–10Na₂O–xNd₂O₃ glasses as a potent radiation shielding material

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Estimation of photoneutron dosimetric characteristics in tissues/organs using an improved simple model of linac head

Cited by 32 publications

References 14 publications

Monte Carlo simulations study on gamma ray–neutron shielding characteristics for vinyl ester composites

Monte Carlo simulations study on gamma ray–neutron shielding characteristics for vinyl ester composites

Estimation of Neutrons Occurring in the Linac Room at Different Photon Energies

The influence of Nd2O3 on the radiation shielding, physical, mechanical, and acoustic properties of the (75 − x)TeO2–15MgO–10Na2O–xNd2O3 glasses as a potent radiation shielding material

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The influence of Nd₂O₃ on the radiation shielding, physical, mechanical, and acoustic properties of the (75 − x)TeO₂–15MgO–10Na₂O–xNd₂O₃ glasses as a potent radiation shielding material