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Gamma ray energy spectrum of a buried radioactive source

Thesis/Dissertation:

Abstract

Because of current attempts to utilize airborne gamma-ray scintillation spectrometers as a means of detecting and identifying buried radioactive mineral deposits, it has become important to study the effects of multiple scattering on the gamma-ray energy spectrum of a source buried in a semi-infinite medium. A series of ten experiments was made. First a scintillation detector was located in air at a fixed distance above a 250 microcurie cobalt-60 source suspended in a large tank. The level of water was raised from 25 cm below the source to 50 cm above, and the gamma-ray energy spectrum was observed. It was found that the high energy portion of the cobalt-60 spectrum remained identifiable even when the source was submerged more than five half-lengths. Further, the ratio of the counting rate of the total incident gamma radiation to the counting rate of the primary 1.33 MeV radiation was found to be very nearly linearly proportional to the depth of water cover. This leads to an empirical method for determining the depth of burial of a cobalt-60 point source. (author)
Authors:
Publication Date:
Jul 01, 1957
Product Type:
Thesis/Dissertation
Resource Relation:
Other Information: TH: Thesis (M.Sc.)
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; COBALT 60; GAMMA SPECTROMETERS; MEASURING INSTRUMENTS; RADIOACTIVE MINERALS; SCINTILLATION COUNTERS
OSTI ID:
21292507
Research Organizations:
Univ. of Western Ontario, London, Ontario (Canada)
Country of Origin:
Canada
Language:
English
Other Identifying Numbers:
Other: ISBN 978-0-542-45328-1; TRN: CA1000360038367
Availability:
Available from University Microfilms International-UMI, 300 North Zeeb Road, PO Box 1346, Ann Arbor, Michigan (United States), under document no. EC45328
Submitting Site:
CANN
Size:
101 pages
Announcement Date:
May 28, 2010

Thesis/Dissertation:

Citation Formats

Massey, N B. Gamma ray energy spectrum of a buried radioactive source. Canada: N. p., 1957. Web.
Massey, N B. Gamma ray energy spectrum of a buried radioactive source. Canada.
Massey, N B. 1957. "Gamma ray energy spectrum of a buried radioactive source." Canada.
@misc{etde_21292507,
title = {Gamma ray energy spectrum of a buried radioactive source}
author = {Massey, N B}
abstractNote = {Because of current attempts to utilize airborne gamma-ray scintillation spectrometers as a means of detecting and identifying buried radioactive mineral deposits, it has become important to study the effects of multiple scattering on the gamma-ray energy spectrum of a source buried in a semi-infinite medium. A series of ten experiments was made. First a scintillation detector was located in air at a fixed distance above a 250 microcurie cobalt-60 source suspended in a large tank. The level of water was raised from 25 cm below the source to 50 cm above, and the gamma-ray energy spectrum was observed. It was found that the high energy portion of the cobalt-60 spectrum remained identifiable even when the source was submerged more than five half-lengths. Further, the ratio of the counting rate of the total incident gamma radiation to the counting rate of the primary 1.33 MeV radiation was found to be very nearly linearly proportional to the depth of water cover. This leads to an empirical method for determining the depth of burial of a cobalt-60 point source. (author)}
place = {Canada}
year = {1957}
month = {Jul}
}