A Comparison of National and International Megavoltage Calibration Protocols
Although the American Association of Physicists in Medicine (AAPM) protocol for the determination of absorbed dose from high-energy photon and electron beams was published in 1983, it was only one of several national and international protocols that have appeared since 1980. These protocols are concerned with the absorbed dose calibration procedures for megavoltage X-ray and electron beams by ionization chamber measurements. The ionization chambers are calibrated at a single photon energy against a national standard, and since this would be the same for all users in a given country, intercomparison of the national standards determines the consistency of megavoltage dose calibrations after differences in the protocols are taken into account between countries.
KeywordsIonization Chamber Radiation Dosimetry Standard Precaution ICRU Report Ionization Chamber Measurement
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