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Your search keyword '"PHOTO-neutron-refractive effect"' showing total 3 results
Start Over Descriptor "PHOTO-neutron-refractive effect" Topic bremsstrahlung
3 results on '"PHOTO-neutron-refractive effect"'

1. Computational study of radiation doses at UNLV accelerator facility.

Author

Hodges, Matthew, Barzilov, Alexander, Yi-Tung Chen, and Lowe, Daniel

Subjects
*DOSE-response relationship (Radiation), *PHOTO-neutron-refractive effect, *BREMSSTRAHLUNG, *PHOTONUCLEAR reactions, *COLLIMATORS
Abstract

A Varian K15 electron linear accelerator (linac) has been considered for installation at University of Nevada, Las Vegas (UNLV). Before experiments can be performed, it is necessary to evaluate the photon and neutron spectra as generated by the linac, as well as the resulting dose rates within the accelerator facility. A computational study using MCNPX was performed to characterize the source terms for the bremsstrahlung converter. The 15 MeV electron beam available in the linac is above the photoneutron threshold energy for several materials in the linac assembly, and as a result, neutrons must be accounted for. The angular and energy distributions for bremsstrahlung flux generated by the interaction of the 15 MeV electron beam with the linac target were determined. This source term was used in conjunction with the K15 collimators to determine the dose rates within the facility. [ABSTRACT FROM AUTHOR]

Published
2017
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2. Estimate of production of medical isotopes by photo-neutron reaction at the Canadian Light Source.

Author

Szpunar, B., Rangacharyulu, C., Daté, S., and Ejiri, H.

Subjects
*PHOTO-neutron-refractive effect, *LIGHT sources, *BREMSSTRAHLUNG, *ELECTRON synchrotrons, *RESONANCE, *MONTE Carlo method
Abstract

Abstract: In contrast to conventional bremsstrahlung photon beam sources, laser backscatter photon sources at electron synchrotrons provide the capability to selectively tune photons to energies of interest. This feature, coupled with the ubiquitous giant dipole resonance excitations of atomic nuclei, promises a fertile method of nuclear isotope production. In this article, we present the results of simulations of production of the medical/industrial isotopes 196Au, 192Ir and 99Mo by (γ,n) reactions. We employ FLUKA Monte Carlo code along with the simulated photon flux for a beamline at the Canadian Light Source in conjunction with a CO2 laser system. [Copyright &y& Elsevier]

Published
2013
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3. Photo-neutron cross-section measurement in the 8 and 10 MeV bremsstrahlung induced reaction of U.

Author

Naik, H., Crasta, Rita, Suryanarayana, S., Sanjeev, Ganesh, Shivashankar, B., Raj Prakash, H., Karunakara, N., Somashekarappa, H., Kumar, M., Nimje, V., Mittal, K., and Goswami, A.

Subjects
*PHOTO-neutron-refractive effect, *CROSS-sectional method, *BREMSSTRAHLUNG, *URANIUM isotopes, *GAMMA rays, *SPECTROMETRY
Abstract

The U( γ, n)U reaction cross-section at the end point bremsstrahlung energies of 8 and 10 MeV was measured by using an activation technique. Induced gamma ray activities were measured by high resolution gamma-ray spectrometer with high-purity germanium detector. The photo neutron cross section on U is also calculated theoretically using TALYS 1.2 computer code. The experimentally obtained reaction cross sections were compared with the flux weighted average values from the literature data based on mono-energetic photon as well as the value from TALYS. It was found that the cross section of U( γ, n)U reaction increases with increase of bremsstrahlung energy and were closer to the flux-weighted experimental data from literature and the values from TALYS based on mono-energetic photons. [ABSTRACT FROM AUTHOR]

Published
2013
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