Effect of well chamber altitude pressure corrections for cesium Blu Cs and CivaDot Pd brachytherapy sources.

Purpose: Previous publications have described how the standard temperature and pressure correction will overcorrect measurements with a low-energy photon low-dose rate brachytherapy source at low ambient air pressures. To account for this effect, an additional correction factor is applied after the standard temperature and pressure correction. This additional correction is dependent on the source being measured and the chamber it is measured in.