Calorimetric Measurements on a Cesium-137 Teletherapy Unit

Abstract

The power in the gamma -ray beam from a Cs137 teletherapy unit has been measured with a calorimeter. Comparison with ionization measurements gives a conversion factor of 2959 plus or minus 44 ergs/cm2r, and combining this result with the calculated absorption coefficient gives a value for W of 33.9 plus or minus 0.5 ev/ion pair.