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Radiation Protection Dosimetry 85:129-131 (1999)
© 1999 Oxford University Press

TSEE Measurement of the Dose of 90Sr/90Y Beta Radiation Behind Absorbers of Different Atomic Number

H. Kessler, W. Kriegseis, M. Petel, M. Schäm and A. Scharmann

With the thermally stimulated exoelectron emission (TSEE) of BeO thin film detectors the dose in the beta radiation field of a 90Sr-90Y 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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