title: Determination of Aion and Pion in the new AAPM radiotherapy dosimetry protocol.
abstract: Simple equations are given by which accurate values of Aion and Pion can be obtained for use in applying the AAPM Task Group 21 dosimetry protocol.
mesh_terms: D002138:Calibration; D006801:Humans; D011874:Radiometry / Q000295:instrumentation / Q000592:standards*; D011879:Radiotherapy Dosage / Q000592:standards*