نتایج جستجو برای: photoneutron

تعداد نتایج: 134  

Journal: :international journal of advanced biological and biomedical research 2015
mahdi jahangiri payman hejazi seyed mehdi hashemi abbass haghparast bardia hajizadeh

objective: using megavoltage photons generated by medical linear accelerator is a common modality for the treatment of malignant. the crucial problem for using photon beams >8mv is the photoneutron yields that increase the risk of secondary cancer that treated with high-energy photon beams. the contaminated neutrons produced in different components of the accelerator head and rely on many param...

Journal: :Nuclear Science and Engineering 2023

High-energy photon interrogation is a nondestructive technique that used to detect special nuclear materials and characterize waste. The development of such systems complex requires Monte Carlo simulations optimize system performance. rely on various scattering, absorption, photonuclear cross-section data. While the scattering absorption data have been extensively studied validated with experim...

A. Amin Moghaddam, A.A. Yousefi Diba, M. Najafi, Mohammad Reza Deevband,

Background: Radiation therapy  uses high-energy radiation to kill cancer cells. Photoneutron contamination and induced radioactivity of high energy therapeutic photon beams are considered as the main source of occupational exposure to radiation therapists who works with linear accelerators operating above 10 MV. Materials and Methods: The gamma dose rates were measured after termination of...

Journal: :iranian journal of radiation research 0
m. najafi department of bioengineering and medical physics, shahid beheshti university of medical sciences, p. o. box 14155-6446, tehran, iran mohammad reza deevband department of bioengineering and medical physics, shahid beheshti university of medical sciences, p. o. box 14155-6446, tehran, iran a.a. yousefi diba department of radiation oncology, hafte tir hospital, p. o. box 1886718136, tehran, iran a. amin moghaddam department of statistical, tarbiat-modares university, p. o. box 14115-111, tehran, iran

background: radiation therapy  uses high-energy radiation to kill cancer cells. photoneutron contamination and induced radioactivity of high energy therapeutic photon beams are considered as the main source of occupational exposure to radiation therapists who works with linear accelerators operating above 10 mv. materials and methods: the gamma dose rates were measured after termination of diff...

Abbass Haghparast Bardia Hajizadeh Mahdi Jahangiri Payman Hejazi, Seyed Mehdi Hashemi

Objective: Using Megavoltage photons generated by medical linear accelerator is a common modality for the treatment of malignant. The crucial problem for using photon beams >8MV is the photoneutron yields that increase the risk of secondary cancer that treated with high-energy photon beams. The contaminated neutrons produced in different components of the accelerator head and rely on many param...

Abbass Haghparast Bardia Hajizadeh Mahdi Jahangiri Payman Hejazi, Seyed Mehdi Hashemi

Objective: Using Megavoltage photons generated by medical linear accelerator is a common modality for the treatment of malignant. The crucial problem for using photon beams >8MV is the photoneutron yields that increase the risk of secondary cancer that treated with high-energy photon beams. The contaminated neutrons produced in different components of the accelerator head and rely on many param...

Journal: :Physics in medicine and biology 2006
S Janek R Svensson C Jonsson A Brahme

A method for dose delivery monitoring after high energy photon therapy has been investigated based on positron emission tomography (PET). The technique is based on the activation of body tissues by high energy bremsstrahlung beams, preferably with energies well above 20 MeV, resulting primarily in 11C and 15O but also 13N, all positron-emitting radionuclides produced by photoneutron reactions i...

2002
T. Kajino

We study the astrophysical reaction rate for the formation of Be through the three body reaction α(αn, γ). This reaction is one of the key reactions which could bridge the mass gap at A = 8 nuclear systems to produce intermediate-to-heavy mass elements in alphaand neutron-rich environments such as r-process nucleosynthesis in supernova explosions, s-process nucleosynthesis in asymptotic giant b...

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