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It also recommended that a parallel biomedical effort on
the carcinogenic action of ingested or inhaled radioactive materials be
closely coordinated with the sampling program.
study are:
Other points requiring
how the particulate material is formed; how to collect
particulates (at present the smaller particles tend to be missed); how to
improve fall-out predictions.
Dr. Kramish ssid that Project Sunshine was making a specific propes2:
that a pilot stage sampling program be carried out in the near future.
This would involve the collection and assay (for Sr-90 and natural
strontium) of a total of a few thousand samples from six glodel areas.
The expense of sampling might be large in certain of the foreign areas.
Among the regions mentioned were Utah (heavy fall-out), Kansas (grain
area), England, Japan, and a South American country,
At this point Dr. Libby reported on some measurements which have
Sr-90
Measurements
and
Data
already been made as part of a "pre-pilot" phase of the program.
He
mentioned measurements made by the AEC (Dr. Eisenbud), by Dr. Kulp at
Columbia, and by his own group at Chicago.
It is very convenient to
determine the Sr-90, by milking it for the short-lived yttriun daughter
and counting the yttrium.
The following data have been obtained,
Sr-90 Activity
Sample
stillborn, full tern baby
(Chicago). .cccceseeceeceeseseel2S + 9 disintegrations/rin
or 3.6 d/min-g Ca
rib from a Harvard man..........+..0.8 d/min-g Ca
filtered sea water (Santa Monica)..less than 22 + 8 d/min-80 liters
clam shells (Long Island)..........0.04 d/min-g Ca
Wisconsin cheese (1 month old).....3 2 0.3 d/min-g Ca
Wisconsin cat bo ne ( 2 yrs ola).....4 + 0.4 d/min-g Ca
an
Montana eat (6 months
‘ h ’
fed on milk from
° range-fed cows) 10 4+ 1 d/rin-g Ca
ai
soil from Lamont, N.iYviccccccccceeseee2h + 2 d/min-g Ca
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