SPECTRUM STRIPPING ANALYSIS OF THE INHERENT SPECTRAL PERFORMANCES OF CHEMICAL VAPOR DEPOSITION (CVD) DIAMOND DETECTORS EXPOSED TO ALPHA-PARTICLE RADIATION
SPECTRUM STRIPPING ANALYSIS OF THE INHERENT SPECTRAL PERFORMANCES OF CHEMICAL VAPOR DEPOSITION (CVD) DIAMOND DETECTORS EXPOSED TO ALPHA-PARTICLE RADIATION
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Date
2012-11
Authors
ABDULLAHI, MUHAMMAD VATSA
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Abstract
The research put forth the outcome of the spectrum stripping analysis used to remove the
defects and background noise levels from the experimental alpha spectra of nine Chemical
Vapour Deposition (CVD) diamond wafers when used as detectors of α-particles radiation.
The spectra, each with different spectral width/peak broadening attributable to the presence
of defect/impurity concentration were analyzed for statistical noise and fluctuations. The
objective was to provide a spectra resolution necessary for comparative spectrometric
analysis to be performed on the detectors under investigation. The detectors average
leakage current was measured to be 5.2pA for Single Crystal (SC); 21.5pA for Detector
Grades (DG); and 5.2pA for Optical Grades (OG) and its contribution to the noise level
analyzed. The poor spectra resolution was reported to be due not only to difference in
defects concentration but also to background statistical effect and noise levels. The
observed effect of defects and background effects on the experimentally acquired spectrum
was analyzed using a High Performance Language MATLAB. An average spectrum peak
resolution of 9.5% for DG, 67.4% for OG and 1.7% for SC was calculated. The average
absolute efficiency of 0.19% for DG, 0.15% for OG and 0.12% for SC, full energy peak
efficiency of 87% for DG and OG, 96% for SC and the particle range from the alpha
particle range-energy plot were all analyzed and the results compared. The results show an
improvement on the experimental observations without affecting the detectors inherent
characteristic performance.
Description
A THESIS REPORT SUBMITTED TO THE POSTGRADUATE
SCHOOL, AHMADU BELLO UNIVERSITY, ZARIA,
IN PARTIAL FULFILMENT OF THE REQUIREMENT FOR THE AWARD OF
MASTERS OF SCIENCE (M.Sc.) IN RADIATION BIOPHYSICS
DEPARTMENT OF PHYSICS
FACULTY OF SCIENCE
AHMADU BELLO UNIVERSITY, ZARIA, NIGERIA
OCTOBER, 2012.
Keywords
SPECTRUM, STRIPPING, ANALYSIS, INHERENT, PERFORMANCES, CHEMICAL, VAPOR, DEPOSITION, DIAMOND, EXPOSED, ALPHA-PARTICLE, RADIATION