Calculated calibrations for ion chambers fabricated from plastics simulating air and muscle; determination of W and tauRa

An experiment is described utilizing two 16-liter ionization chambers, fabricated from electrically conducting plastics which closely simulate air and human muscle, designed to minimize most of the errors inherent in the use of cavity chambers. A careful calibration was done, using a 226Ra source in...

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Bibliographic Details
Published in:Radiation research 1968-12, Vol.36 (3), p.384
Main Authors: Rose, J E, Shonka, F R
Format: Article
Language:English
Subjects:
Air
Algorithms
Biomimetic Materials - chemistry
Calibration
Ions
Muscle, Skeletal - physiology
Plastics - chemistry
Radiation Dosage
Radiometry - instrumentation
Radiometry - methods
Radiometry - standards
Reproducibility of Results
Sensitivity and Specificity
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Summary:An experiment is described utilizing two 16-liter ionization chambers, fabricated from electrically conducting plastics which closely simulate air and human muscle, designed to minimize most of the errors inherent in the use of cavity chambers. A careful calibration was done, using a 226Ra source in 0.5 mm platinum, in an almost scatter-free environment which permitted the derivation of accurate corrections for scatter and air attenuation. Calibrations calculated from the physical measurements of the ion chambers are compared with the experimental calibrations. Values of Wbeta for air, and muscle gas and of tauRa are derived.
ISSN:0033-7587
DOI:10.2307/3572575