Masters Theses

Abstract

"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.

Advisor(s)

Tsoulfanidis, Nicholas

Committee Member(s)

Edwards, D. R.
Johnson, Charles A.

Department(s)

Nuclear Engineering and Radiation Science

Degree Name

M.S. in Nuclear Engineering

Publisher

University of Missouri--Rolla

Publication Date

1973

Pagination

vii, 45 pages

Note about bibliography

Includes bibliographical references (pages 42-44).

Rights

© 1973 Ezatholah Aslani-Amoli, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

Gamma ray spectrometry -- Mathematical models
Albedo -- Measurement
Radiation -- Research

Thesis Number

T 2933

Print OCLC #

6020356

Electronic OCLC #

911286543

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