ce come at a aunteae HAMELa AMM 4 dla + Hat had . t aitdiea- . . + tee ype dee, a a Tht ab a “ti ablaeecoERESS sat aa: ne en ‘etl J _ AUALYPICAL FROGRHDURSS *® Tho Zealth and Safety Laboratory SUNSIIIVS studies recuired ar lysis for total radiostrontium, Sr°°, normal strontium. and radium ins variety cf sample types, Where radicactive measurements wore involved i WAS neces sary that the chemical procedures produca samples suitable fo the count= ing equipment available in the laboratory. For this reason + a methods which were developed wera designed to handle relatively larze sampleso In uptake studies, where relative values between different sa le types taken in the same location were to be analyzed, the determina on of total radiostrontium was preferable becauss of the relatively high al compared with Sr’? alone, In some cases, the main purpose of required Sr9° determinations and, where necessary, this was do With the lower activity levels of Sr°° the confidence in the r reduced as is shown by the counting errors ziven with each ana result. It should be emphasized that the lower confidence is matter of counting statistics and is not related to confidence chemical methods used to prepera sampleso The determination of total radiostrontium, Sr99° and normal stro tium 411 require separation of strontium fran the sample matrix, Cur 6x eriancs indicates that the most satisfactory method is the presipitatio of strontium, with added carrier if necessary, from 753 nitric acd solutions, This yields a cletn precipitation which is reedily eollected on ilters for counting of total radiostrontiwum or for the further treatmen requirad for Sr9° or normal strontiun detormination, Different sample ty quire different treatments to prepares them for this ssparation 3 majority of our samples could te classified as soil, sons, veset Liquids (milk, water, urine and the like). The pralininary separ are solution of the sample and collection of the strontium ami : materials and their sonversion to nitrates, The nitrate separati then carried out in a volume of nitric acid appropriate to the te quantity of nitrates obtained, Two nitrate separations ara alway stroutium. This precipitate may then be analyzed fer its Sr? Sy measurement of the y90 daughter in equilibrium with the Sr39, allowing the yield to build up in the nitrate precinitate, which aoproximately 12 davs, 0 may be semarated Sy an ammonicm orircxi yrecicitation with lacthacium carries, x e _— « NE” oe gay nm = a” ee ee This rowsipitacte is irlisbet = wet i ee ee ee. = The details of all the analytical precedures used in obtaining Fesults for this report are tiven in Appendix A, Ee