= 2 INTERLABORATORY CHECK DATA I. Checks with Lamont and NYOO _ ds a test of the reliability of the strontinm-90 data obtained by each of the several participating laboratories, a number of samples were divided and exchanged as check samples. Results for check samles measured at the Lamont Geological Observatory, the Health and Safety Laboratory of the New York Operations Office and the University of Chicago are presented in Table I. Of these, the mst recent data are for CL 305, 326, 327 and 328, which were measured early in 1955, Additional check samples have been exchanged and are in process of measurement. Table I. Chicago-Lamont-NYOO Check Data CLNo. ! CLh7 } Alfalfa, Chicago Milk- CL 66 Sample Description Chicago Lamont* nyoo** [h.05 + 0.15 _ 30 + 14 Milk, Chicago Milkshed #6 0.73 + 0.0h _ 0.2 + 0.1 | shed #6 { SUNSHINE UNITS CL101 | Soil, Chicago Milkshed 113.1 + 0,3 — 8,1 + 0.5 CL102 ! Soil, Chicago Milkshed #6, 12.5 + 0.8 — 17.0 + leh #6-A, O~l", NH),AC extract .| | O-1", HCL after NH),AC | extract, CL 104,5 | Calf bone, Troy, NeYe, CL17, | YB-5, HASL 249 | Cheese, Azores, YC-1 CL 175 : Cheese, Wisconsin Min| ster, YC); cL176 CL 305 3e7h + 0.05 1.53 + 0,03 i 6! cals bone, Lewiston, Mont.,1.95 + 0.0) | YB-3, HASL 2h6 ; | Sheep bone, Normandie, | France, YB-19, HASL 651 3.36 + 0.22 . | | 2669 + 0.06 2.86 + 0.10 2.85 + 0.10 (continued) wae 1.21 + 0,14 . ~204 — _— 1.35 + 0,09 . ; 2.0 + 0.2 , ; 2.82 + 0.06 0.33 + 0.03 DOE ARCHIVE 130