The procedure outlined in NYO-l617 was followed for the
radiochemical analysis of Sr?70.
The Cgi3? analyses were performed
by S. Tarras using a method which to date has not been documented.
It involves the coprecipitation of cesium with ammonium alum to
eliminate mixed fission products as well as potassium, then a final
precipitation as the chloroplatinate. Radiochemical and gravimetric yields of 95% are attainable.
The samples were analyzed for
calcium by C. Baxter employing the oxalate-permanganate titration
method ‘4),
As a check on radiochemical purity, beta absorption analyses were carried out by N. Haliden(?) on the Csl37 fractions of two
pooled urine samples (specimens. collected at Utirik and Likiep),
one water sample (HASL #357), and one soil (HASL #3462).
In each
case Csl37 was positively identified and there was no evidence of
other interfering isotopés.
The radioactive decay of the Y frac-
tions of the urine samles was followed over a period of one hundred
hours. Within statistical limite concurrence with the theoretical
half-life was observed.
Analytical results are shown in Tables 2 through 6.
The
error term accompanying each absolute result represents one stan-
dard deviation due to the error in counting.
The only available
interlaboratory cross-check data are given in Table 7.
tos,a
50020b6
These