Determination of low concentrations of iodine-131 in fast-reactor coolant systems.

A method has been devised for the determination of iodine-131 in the presence of mixed fission products in reactor coolants, by oxidation to elemental iodine followed by sublimation on to copper gauzes. The method reduces to a minimum contamination of the copper gauzes by ruthenium-103 and ruthenium-106 and eliminates contamination due to technetium-99 and caesium-137. It is possible to determine 10(2)cpm ml from iodine-131 in a total count of 2 x 10(6)cpm ml of fission products, with an accuracy of +/- 3%.

Adsorption of chloro-complexes of the first row transition elements by Dowex A-1.

A study has been made of the adsorption of chlorocomplexes of the first row transition metals by the chelating resin Dowex A-1, and possible mechanisms for adsorption have been reviewed. Relative adsorption follows the series Zn(II) > Co(II) = Fe(III) Cu(II) > Mn(II). Negligible adsorption occurred with Cr(III) and none with V(IV) and Ni(II).