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|Title: ||A STUDY OF GAMMA RAY TOTAL ATTENUATION AND PHOTO ABSORPTION COEFFICIENT IN DIFFERENT ELEMENTS|
|Authors: ||Dilbetigle, Assefa|
|Date Added: ||6-Sep-2007 |
|Abstract: ||The study intends to measure the transmission of gamma rays such as 137Cs, through
Aluminium, Iron, Nickel, Copper, Tin, and lead absorbers using gamma ray spectroscopy
techniques. Electrical pulses, carrying the physical information is displayed on the computer
screen with the number of channels on the horizontal scale and number of pulses
on the vertical scale. The multichannel Analyzer will then process there pulses, which
The total linear attenuation coefficient (μ) of 662Kev gamma rays have been measured
in the extended media of six elements under different geometry condition and using HPGe
and NaI(Tl) detectors. Better result of total linear attenuation coefficient is obtained when
an absorber near to a detector and using HPGe detector. This is due to the decreases in
the exposure of the detector to the beams of gamma rays and high resolution power of
HPGe detector respectively.
It also aims to determine the total linear attenuation coefficients for Tin using the
energy of photons 122kev, 662kev, 1172kev, and 1332kev and to evaluate how it varies as
a function of gamma rays energy. The result generally agree with theoretical calculations.
Some discrepancies can be explained by the collimation, media and geometry of absorber.
The dependence of cross-section on the atomic number and the energies of gamma ray
is also seen due to the increases of binding energy and penetration power of gamma ray.|
|Description: ||A THESIS PRESENTED TO
THE SCHOOL OF GRADUATE STUDIES
ADDIS ABABA UNIVERSITY
IN PARTIAL FULFILLMENT OF THE REQUIREMENTS
FOR THE DEGREE OF
MASTER OF SCIENCE in PHYSICS|
|Appears in:||Thesis - Physics|
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