|SREL Reprint #1968|
SEPARATION AND DETERMINATION OF RADIOSTRONTIUM IN CALCIUM CARBONATE MATRICES OF BIOLOGICAL ORIGIN
S. B. CLARK
Radiostrontium is concentrated in the shells of mollusks and other animals due to
the isomorphic substitution of strontium for calcium in the calcium carbonate shell
matrix. Radiochemical separation of strontium from such matrices is difficult
because of the chemical similarity between strontium and calcium. This paper
describes a technique using a commercially-available, solid-phase extractant to
separate Sr-89 and Sr-90 from high concentrations of Ca2+. The extractant
removes Sr(NO3)2 from acidic nitrate media, and strontium activities are
determined via conventional ß-counting techniques. This method has been used to
process mollusk shells collected from contaminated reactor cooling ponds at the
Savannah River Site and Chernobyl Nuclear Power Plant.
SREL Reprint #1968
Clark, S.B. 1995. Separation and determination of radiostrontium in calcium carbonate matrices of biological origin. Journal of Radioanalytical and Nuclear Chemistry 194:297 302.