sca, rots SEeee ttt Lael ve Milk The results of milk enalyses performed since the issuance of NYO-751 are given in Table 8 and the continuous curve for dried milk is shown in Fig. 6. | The level increased during the summer of 1956 and has maintained its level after the normal pasture season, This probably indicates that the cows are feeding on vegetation exposed during the summer and will stay at the same level until the next pasture season, — In NYO-,751, some concern was shown that wet milk purchased in New York City showed higher levels than the dried milk being analyzed. This is apparently due to the difference in source area of the two supplies. As a check, however, Dr. Alexander obtained wet milk, dried milk, and the washings from the drier during a run at Colunbus, Wisconsin. These samples are being analyzed to check possible loss of Sr-90 during processing and to test uniformity of run. Wet milk samples were not run during this reporting period, but a more extensive sampling program for the city supply was started at the first of 1957. Some of the dried milk samples have been analyzed for stable strontium, The preliminary data are given in Table 9, Tests have shown that dry ashing of milk results in loss of Cs-137, even at low temperatures. No Cs-137 results on milk will be reported until improved technicues are evaileble. ~o6