Abstract
With the thermally stimulated exoelectron emission (TSEE) of BeO thin film detectors the dose in the beta radiation field of a 90 Sr- 90 Y point source behind absorbers of different atomic number and thickness was determined. The absorbers consisted of either tissue-equivalent materials, aluminium, copper or gold. Their thickness ranged from 0 to 200 mg.cm -2 . The TSEE detectors and absorbers were placed on a PMMA slab phantom at perpendicular radiation incidence. For Cu absorbers a Cu slab phantom was additionally used, for comparison. Increasing atomic number of the absorber causes stronger dose buildup behind an absorber thickness of 20-40 mg.cm -2 which can be attributed to the differences of mass scattering power.
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