Relative electron dosimetry using a synthetic diamond probe

Implementation of Bragg–Gray Cavity Theory in electron dosimetry is complicated by the fact that most commercial detector volumes behave as small field inhomogeneities. Several correction factors are necessary to establish the absorbed dose at a particular point in a homogenous tissue-equivalent pha...

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Bibliographic Details
Published in:Radiation physics and chemistry (Oxford, England : 1993) England : 1993), 1999-04, Vol.54 (4), p.325-334
Main Authors: van der Merwe, D.G., Keddy, R.J.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Electron and positron dosimetry: measurements
Medical sciences
Radiation therapy and radiosensitizing agent
Treatment with physical agents
Treatment. General aspects
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Summary:Implementation of Bragg–Gray Cavity Theory in electron dosimetry is complicated by the fact that most commercial detector volumes behave as small field inhomogeneities. Several correction factors are necessary to establish the absorbed dose at a particular point in a homogenous tissue-equivalent phantom. The energy dependence of air and the replacement effects introduced as a result of air ionization chambers’ construction and size, increase the uncertainty of electron beam calibrations. Preliminary relative dose measurements performed with a prototype synthetic diamond are presented here. Theoretically, the radiation response of diamond, synthetic or natural, has negligible energy dependence. The sensitivity and small size of the probe makes it an excellent candidate for measurements in fields of high dose gradient.
ISSN:0969-806X
1879-0895
DOI:10.1016/S0969-806X(98)00268-0