COMPARISON OF THE THERMAL-DESORPTION SPECTRA AND EXOEMISSION SPECTRA OF BEO-TIO2 AND BEO-LI THERMALLY STIMULATED EXOELECTRON EMISSION DETECTORS

In thermally stimulated exoelectron emission (TSEE) dosimetry the irra diation is generally executed in air while the read out is in methane. Under these conditions adsorption/desorption effects appear which inf luence the exoemission. BeO:Li and BeO:TiO2 ceramics were compared fro m this point of view. The effect of adsorption/desorption was studied in such a way that in the cycles of irradiation/read-out the cooling d own was executed successively in a methane atmosphere or in air. The T SEE curves of the BeO:TiO2 ceramic were more influenced by the cooling atmosphere than those of the BeO:Li ceramic, In order to explain this result the thermal desorption spectra of these materials was taken. ( C) 1997 by John Wiley & Sons, Ltd.