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Radiation Protection Dosimetry 33:315-317 (1990)
© 1990 Oxford University Press

Measurement of Skin Dose with TSEE From BeO

M. Aoki, S. Okabe, M. Nishikawa and T. Nishikawa

A commercial ceramic BeO disc (Thermalox 995) and a ZnO thin film were used as TSEE specimens. The ß ray sensitive surface layer of a TSEE specimen acts as a very thin absorbed dosemeter. The absorbed dose of ß rays was measured using an extrapolation ionisation chamber. The experimental value of the conversion factor between the number of exoelectrons emitted from a Thermalox 995 TSEE specimen and the absorbed dose in the thin surface layer of the same specimen was about 84 pGy per exoelectron, and the value for a ZnO thin film was about 96 µGy per exoelectron. By covering a TSEE specimen with a tissue-equivalent material layer of 7 mg.cm-2 thickness, an easy measurement of the individual dose equivalent, superficial, Hs(0.07), is possible without any information on ß ray irradiation energy.


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