| Influence of field size on a PTW type 23342 plane-parallel ionization chamber's response. | |
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MedLine Citation:
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PMID: 15651603 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The response of a PTW type 23342 plane-parallel ionization chamber, both in air and in phantom, was evaluated for x-ray tube potentials between 30 and 100 kV and radiation field diameters ranging from 30 to 70 mm. The experiments were performed with a calibrated Pantak x-ray machine and made use of the same set of x-ray qualities adopted by the PTB primary laboratory for the calibration of such chambers. A Plexiglas phantom (1.18 g cm(-3)) 110 mm long, 110 mm wide, and 80 mm deep was used for phantom measurements. X-ray qualities were characterized by using 99.99% pure aluminum filters. On the basis of the IAEA's TRS 398, the article discusses the dependence of the plane-parallel ionization chamber readings with field size in air and in phantom, its implication with regard to clinical dosimetry, cross-calibration, and dissemination of calibration factors. |
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Authors:
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C Austerlitz; H P Villar; M A P Santos |
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Publication Detail:
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Type: Evaluation Studies; Journal Article |
Journal Detail:
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Title: Medical physics Volume: 31 ISSN: 0094-2405 ISO Abbreviation: Med Phys Publication Date: 2004 Dec |
Date Detail:
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Created Date: 2005-01-17 Completed Date: 2005-04-21 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0425746 Medline TA: Med Phys Country: United States |
Other Details:
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Languages: eng Pagination: 3201-5 Citation Subset: IM |
Affiliation:
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Centro Regional de Ciências Nucleares da CNEN, Rua Cônego Barata, 999, Recife, PE Brazil 52110-120. auster@elogica.com.br |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Equipment Design Equipment Failure Analysis* Radiation Dosage Radiometry / instrumentation* Reproducibility of Results Scattering, Radiation Sensitivity and Specificity |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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