2 ER ORT RIE 46 . . 232 . . . U spike was determined by comparison Tne distintegration rate of the ttre activities of aliquots (in quadriplicate) of the 2321, spike and a 038) ster tied solution electroplated simultaneously onto platinum discs. The 238 U "+yens used for the standard were prepared by dissolving precisely weighted ave ts Of 99°¢ pure 238), “D-38" metal supplied by the Lawrence Livermore oratory. The 20854 spike was supplied as a radiochemical standard solution by the r2it three years by intercomparing the radioactivity of plated samples with s.5.6,, Battelle N. W. and the Lawrence Livermore Laboratory. Replicate determinations of the plutonium concentration in a dissolved wetsront (section 8-10 cm of core B-2) were performed to provide an estimate “fees analytical precision of the radiochemical procedures for plutonium as'ysis. *1* 9, The quantity of sediment (dry wt.) in each aliquot processed was The chemical yield calculated from the counting data for these sevTles ranged from 22.6 to 40.8 per cent. The precision for the 23942405, x terrination was 5.3% of the mean concentration at 2. S.D. for the six avzivses. The precision for 2385, measurement was 11% of the mean at 2. S.D. ‘cr the six analyses. The higher deviation about the mean for 2385 replicates 's probably due to poorer counting statistics (average of 124 counts/800 wae), as all six 238py concentrations found were within 2. S.D0. counting evrers of each other. ikpepe + peer a nee rates in the 238 peak vs. 5000 counts/800 minutes in the 2297?*°pqutonium RE epmI ~~ sooner mam et FAee eeeee em gabe ep OT ae RUIN oe ae mpe hreshar/Searle Corporation and has been calibrated several times during the 4.2-4 Quality control Problems of individual sample contamination were addressed ‘« the inclusion of spiked reagent blanks inserted into the normal flow of Sesples which were processed. From several such reagent blanks, no significant