| Comparison of natural and synthetic diamond X-ray detectors. | |
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MedLine Citation:
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PMID: 21080140 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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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. |
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Authors:
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S P Lansley; G T Betzel; P Metcalfe; L Reinisch; J Meyer |
Publication Detail:
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Type: Journal Article Date: 2010-11-16 |
Journal Detail:
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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:
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Created Date: 2011-02-07 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8208130 Medline TA: Australas Phys Eng Sci Med Country: Australia |
Other Details:
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Languages: eng Pagination: 301-6 Citation Subset: IM |
Affiliation:
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Department of Physics and Astronomy, University of Canterbury, Christchurch, New Zealand, stuart.lansley@canterbury.ac.nz. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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