The chemical consequences of ion implantation and thermal neutron capture in alkali selenates

Influence of Cationic Dopants on the Thermal Annealing of Reactor-Irradiated K2SeO4

“…In no sample was elementary selenium found [15]. The average error after the Se^/Se^ separation was ca.…”

“…The initial batch of K 2 Se0 4 was synthesized by the fusion of elementary selenium with KN0 3 in a platinum crucible [15). Heating above 400"C after the reaction was completed eliminated excess nitrate.…”

“…The technique for the separation of Se' v and Se^1 from the neutron-irradiated samples was that of complexing Se^ with sodium diethyldithiocarbamate followed by extraction with CC1 4 [15]. In no sample was elementary selenium found [15].…”

“…In fact, it would seem that each of these models may account for the experimental results in certain systems and under certain physico-chemical conditions [12], a statement which would apparently hold in the case of K 2 Se0 4 matrices. Reactor-irradiated selenates present some pecu-liarities as compared to the other oxyanions and particularly to K 2 Cr0 4 : 1) they are quite sensitive to ionizing radiation even at liquid nitrogen temperature [15,16]. This observation would indicate that mobile charges which would participate in the annealing process can be created in the solid at low temperature.…”

Isotopic Exchange in a Neutron-Irradiated Mixed-Valence Compound: Tl3′Tl′′′Cl6

“…It was emphasized that the study of the exchange between normal lattice occupants eliminates conjecture regarding the actual chemical State and environment of the exchanging species; as it is well known, considerable doubt may exist about these factors, whenever the exchanging species are introduced in the lattice as dopants, either by chemical [2][3][4][5] or by physical [6][7][8][9]means.…”