Abstract
The initial retention of the SeO 4 2− ion thermal neutron capture has been studied in various matrices by chemical analysis. A comparison between the thermal behaviour of the chemically analyzed Se IV and the disappearance of the E.P.R. species SeO 3 − and SeO 3 − showed that the retention fraction would included all species with oxidation state higher or equal to VI. The retentions observed in the different matrices show the existence of four families with respective retentions of: 2.6% [K 2SeO 4 diluted in (NH 4) 2SO 4], 9.2% [anhydrous and hydrated Li and Ca selenates; K 2SeO 4 diluted in NaIO 3; Se + implanted in K 2SeO 4; Triglycine selenate], 21.5% [K 2SeO 4 diluted in KNO 3, K 2SO 4, Na 2WO 4 and Na 2WO 4.2H 2O] and 32.0% [Na, K and Cs selenates]. Whereas chemical considerations may be invoked for the (NH 4) 2SO 4 matrix, a mechanical model is proposed for the three other groups.
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