Strontium — 90 Result: , Yr Error Term: + E+ De Ry + Roe U ® 2.22 = pCi/unit (4-1} vO+T-B (4-2) C-T:-8 where, Cc = gross counts D = decay of 904 T = count time, minutes Ry = 85 Sr recovery B = background, cpm Ro = yttrium gravimetric recovery E = efficiency, cpam/dpm U = units (volume or weight) Y = ingrowth 90y 2.22 = conversion factor, dpm/pCi Gross Alpha and Beta Result: F (=CT - e| (4-3) U Error Term: + 2 vOrTB C-—T*B . The counting factor: 1 ae E « 2,22 (4-4) Liguid Scintiliation for Alpha and Beta (= -5) — -—B T —_—_—-— E*U * 2.22 ; Result: Error Term: pCi/unit C —+8 T + 9 (4-5) (4-6) Alpha Spectrometry N V Result: — No Error Term: + 2 (A, or Ad) ]IP) = Ay. TVA)1 = A 2 (4-7} _! (4-8) — Vo — 4 No 127