Materials for Depth Dose Measurement

Abstract

The suitability of various materials, commonly used for depth dose measurement, has been tested by comparing their electron densities and effective atomic numbers with those of water. A powder mixture has been prescribed and tested which is satisfactory as a filling medium for “bolus” bags and for depth dose work in hollow anatomical models. Experimental methods for determining both the electron density and effective atomic number of light substances have been developed and have enabled similar critical tests to be applied to substances of indefinite composition such as mixed waxes and pressdwoods.