Document Detail

Influence of field size on a PTW type 23342 plane-parallel ionization chamber's response.
MedLine Citation:
PMID:  15651603     Owner:  NLM     Status:  MEDLINE    
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.
C Austerlitz; H P Villar; M A P Santos
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Publication Detail:
Type:  Evaluation Studies; Journal Article    
Journal Detail:
Title:  Medical physics     Volume:  31     ISSN:  0094-2405     ISO Abbreviation:  Med Phys     Publication Date:  2004 Dec 
Date Detail:
Created Date:  2005-01-17     Completed Date:  2005-04-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0425746     Medline TA:  Med Phys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3201-5     Citation Subset:  IM    
Centro Regional de Ciências Nucleares da CNEN, Rua Cônego Barata, 999, Recife, PE Brazil 52110-120.
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MeSH Terms
Equipment Design
Equipment Failure Analysis*
Radiation Dosage
Radiometry / instrumentation*
Reproducibility of Results
Scattering, Radiation
Sensitivity and Specificity

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