‘. ee El total radiostrestium, 0 » normal’ strontium, and radium in a sample types, Where radioactive measurements were involved it variety of sary thet the chemical procedures produce samples suitable for ing equipment available in the laboratory, For this reason th ee Oe which were developed were designed to handle relatively large In uptake studies, where relative values between different s @ types oc taken in the same location were to be analysed, the determinat radiostrontius was preferable because of the relatively high aokivrity compared with $r°9 alone, In some oases, the min purpose of required $r9° determinations and, where necessary, this was do With the lower activity levels of Sxr9° the confidence in the r reduced as is shown by the counting errors given with each ana result. It should be emphasized that the lower oonfidence is matter of counting atatistios and is not related to confidence chemical methods used to prepare samples. ut dytical ely a the The determination of total radiostrontium, Sr?° and normal atrd@ntium all require separation of strontiom fraa the sample matrix, Ou edperience indicates that the most satisfaatory method is the preoipitatidn of strontium, with added carrier if necessary, from 75% nitrio acd solution. This yields a olean precipitation which is readily collected for cougting of total radiostrontium or for the further trea for Sr9° or normal strontium determination, Different sample filters majority of our semples could be olassified as soil, bone, veggtation and liquids (milk, water, urine and the like). The preliminary se quantity of nitrates obtained, Two nitrate separations are al¥ays formed and where the bulk of the mtrix mterial is high, an agditional - separation may be required. The final nitrate precipitate my be direotly oounted for tote strontium, This precipitate my then be analyzed for its Sr9 by measurement of the Y?° daughter in equilibrium with the S3r°P. After h requires approximately 12 days, yy my be separated by an enmonium hydroxide precipitation with lanthanium carrier. This precipitate is oofleoted on a filter for counting. * i meee Bt wm we ts allowing the yield to build up in the nitrate precipitate, Thedetails of all the analytical procedures used in obtaining resulta for this report are given in Appendix A, ~~ = en 00131986.009 1051038