: 7 Fas as ~ ss .° s th ™~ 7 SA “= * . S ~ - sy ~~ ~ xIw te ~ . aEN Ws % : SS es y The analytical methods are satisfactory for all types csample except milk. There is considerable loss of cesium in the dry ashing process, even at 500°C. Still lower temperatures and a wet ashing process are being evaluated. The methods for analysis of Sr-90, Sr-89, Cs-137, calcium, strontium and mixed fission products are included in the Analytical Branch Laboratory manual, which is being issued in loose-leaf form as NY0-700. Standard Sauples Standard samples are being prepared to assist laboratories toeiet 1 Beinn Bp wi nT NNRacRRRI egetor tlaaga a Bo AERA Nat BRT me Laboratory Manual starting work on strontium analysis. These ares 1. Milk Ash 2s Bone Ash (Animal) 3. Bone Ash (Simulated Human) le Bone Ash (Blank Ca, (PO),).) Se Vegetation Ash (Hay) 6. Mixed fission Products (For Separation Studies ) Te Soil 8. Stendard Sr70-¥?° solution in ampoules (100 d/m) Samples 1, 3 and ); are being analyzed at three or four labora= toriese Samples 2, 6 and 8 are in preparation. These samples will be forwarded to any laboratory, on request, with a statement of Sr-90 and calcium content. From 200 to 500 bottles of each sample will be avail- able, each one adequate for duplicate or triplicate analysese - };2 - - * ~~%- ons oe Seok w =tA S * WS