A formulation for high-energy photon and electron beam dosimetry.
A formalism is derived to estimate the absorbed dose to a medium irradiated by high-energy photon and electron beams using an ionization chamber calibrated in terms of the exposure and this is compared with those in particular NACP and AAPM protocols. The influence of the humidity in air on the response of the chamber is taken into account in combination with various correction factors. In the present proposal, the fundamental factors needed for converting the reading of a chamber, calibrated in exposure (or air kerma), into absorbed dose are calculated for dry air in the calibration beam. For the user's beam, correction factors depending on the atmospheric conditions prevailing in the laboratory are given.
Shiragai
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Division of Physics, National Institute of Radiological Sciences, Chiba-shi, Japan.
D002138:Calibration; D004583:Electrons; D011827:Radiation; D011874:Radiometry / Q000295:instrumentation / Q000379:methods*