"Gamma-ray number, energy and dose albedo are calculated with the Monte Carlo technique. A plane monoenergetic beam was considered at normal incidence upon single material shields at initial gamma energy up to 10 MeV. Aluminum, iron and lead are used as shield material. The contribution of secondary photons which are produced as a result of various photon interactions in the shield are taken into account. These secondary photons are annihilation gammas, X rays and bremsstrahlung gammas. In certain cases, they constitute a considerable fraction of the reflected radiation.
Annihilation gammas predominate in the reflected radiation for all energies above 1.02 MeV. For example, in the case of 8 MeV photons incident on lead, 96% of the reflected particles are .511 annihilation gammas.
The X-ray contribution to albedo is more pronounced at low energy and high Z material. For example, this contribution is 57% to number albedo, 94% to energy albedo and 38% to dose albedo for .41 MeV photons incident on lead.
Bremsstrahlung contribution increases both with atomic number z and photon energy. It amounts to 13% of number albedo, 24% of energy albedo and 23% of dose albedo for 10 MeV photons incident on lead"--Abstract, page ii.
Edwards, D. R.
Johnson, Charles A.
Nuclear Engineering and Radiation Science
M.S. in Nuclear Engineering
University of Missouri--Rolla
vii, 45 pages
© 1973 Ezatholah Aslani-Amoli, All rights reserved.
Thesis - Open Access
Gamma ray spectrometry -- Mathematical models
Albedo -- Measurement
Radiation -- Research
Print OCLC #
Electronic OCLC #
Link to Catalog Record
Aslani-Amoli, Ezatholah, "Calculation of gamma-ray albedo using the Monte Carlo method" (1973). Masters Theses. 3476.