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This paper describes a study of technetium solubility and migration under chemical conditions representative of those prevailing in a Boom Clay environment. Laboratory and  in situ  measurements yielded similar aqueous concentrations of technetium, of about 1×10 −8  mol dm −3 , close to the concentrations measured for hydrated technetium(IV) oxide TcO 2 ·1.6H 2 O in the solubility studies. From fitting the curves of the Tc concentrations as function of time, distribution coefficient (K d ) values were estimated to lie between 0.8 cm 3  g −1  and 1.8 cm 3  g −1 . Exposure of the system at 80 °C and to γ-radiation dose rates of several hundred Gy h −1  resulted in only minor differences in behaviour.

Technetium behaviour in Boom Clay – a laboratory and field study