M.Sc. Tezi Görüntüleme

Student:	Hasan BALTAŞ
Supervisor:	Assoc. Prof. Dr. Uğur ÇEVİK
Department:	Physics
Institution:	Graduate School of Natural and Applied Sciences
University:	Karadeniz Technical University, Turkey

Title of the Thesis:	THE MEASUREMENT OF MASS ABSORPTION COEFFICIENTS OF THE SAMPLES YBCO, BSCCO AL, CU AND PB AT 511 KEV, 661 KEV AND 1274 KEV ENERGIES
Level:	M.Sc.
Acceptance Date:	24/1/2003
Number of Pages:	73
Registration Number:	i1349

Summary:

In this study, we have measured mass absorption coefficients of the elements Al, Cu, Pb and superconducting samples YBCO, BSCCO at 511 keV, 661 keV and 1274 keV energies.

Samples were irradiated using 0.5 mCi (137)^Cs (E_&=661 keV) and 2 mCi (22)^Na (E_&=511 keV and 1274 keV) radioactive sources. Photons crossing the samples were counted using a multi-channel analyzer with a NaI(Tl) detector. The Nucleus II software is used to analyze the spectra.

It is observed that the mass absorption coefficient decreases with increasing energy and increases with increasing atomic number.

The measured coefficients were found in close agreement with theoretical values.

Keywords: Mass absorption coefficient, oxide superconductors, radioactivity, multi-channel analyzer.

not: ^ = super script

_ = sub script

& = gamma