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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