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Comparison of natural and synthetic diamond X-ray detectors.
MedLine Citation:
PMID:  21080140     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Diamond detectors are particularly well suited for dosimetry applications in radiotherapy for reasons including near-tissue equivalence and high-spatial resolution resulting from small sensitive volumes. However, these detectors have not become commonplace due to high cost and poor availability arising from the need for high-quality diamond. We have fabricated relatively cheap detectors from commercially-available synthetic diamond fabricated using chemical vapour deposition. Here, we present a comparison of one of these detectors with the only commercially-available diamond-based detector (which uses a natural diamond crystal). Parameters such as the energy dependence and linearity of charge with dose were investigated at orthovoltage energies (50-250 kV), and dose-rate dependence of charge at linear accelerator energy (6 MV). The energy dependence of a synthetic diamond detector was similar to that of the natural diamond detector, albeit with slightly less variation across the energy range. Both detectors displayed a linear response with dose (at 100 kV) over the limited dose range used. The sensitivity of the synthetic diamond detector was 302 nC/Gy, compared to 294 nC/Gy measured for the natural diamond detector; however, this was obtained with a bias of 246.50 V compared to a bias of 61.75 V used for the natural diamond detector. The natural diamond detector exhibited a greater dependency on dose-rate than the synthetic diamond detector. Overall, the synthetic diamond detector performed well in comparison to the natural diamond detector.
Authors:
S P Lansley; G T Betzel; P Metcalfe; L Reinisch; J Meyer
Publication Detail:
Type:  Journal Article     Date:  2010-11-16
Journal Detail:
Title:  Australasian physical & engineering sciences in medicine / supported by the Australasian College of Physical Scientists in Medicine and the Australasian Association of Physical Sciences in Medicine     Volume:  33     ISSN:  0158-9938     ISO Abbreviation:  Australas Phys Eng Sci Med     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2011-02-07     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8208130     Medline TA:  Australas Phys Eng Sci Med     Country:  Australia    
Other Details:
Languages:  eng     Pagination:  301-6     Citation Subset:  IM    
Affiliation:
Department of Physics and Astronomy, University of Canterbury, Christchurch, New Zealand, stuart.lansley@canterbury.ac.nz.
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