separated with fuming nitric acid.
The sample was then stored to allow
the Sr9° to equilibrate with its yttrium daughter,
At this stage the
yttrium was separated and precipitated as the oxalate for beta counting.
sr70 was determined from the counting rate of y7°, and sr89 by
counting total strontium and subtracting the Sr°”
Reporting.
me/mic/mo »
90 result.
gr70 and total Bp activity are reported in units of
These values were calculated from the original counting data
(d/n/aliqiot) using the formule;
D
mo/mi Jno =
d/m/aliquot
Frojected ares
Total sample volume
Aliquot volume
x
of funnel (ft~)
1
7926
X
For the purpose of these calculations "Total sample volume" refers to
the volume of the month's rainfall computed from official U. S. Weather
Bureau data, (>)
The Sr&? values were obtained in the same way but for convenience
of comparison, were extrapolated to the first day of each sampling month
before calculating the sr°9/50 ratios.
FINDINGS
The data are completely summarized in Table 1.
Total 6 activity,
Sr?79 and sr&9/9 ratios and rainfall volumes are listed by station for
each samplinz mont
date
.
as
.
.
.
.
es
7 “SRNR
TA
8
at
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an
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ee
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ge enesemeIEEEEPTTEF
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ee
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et ~~ *
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es,
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s
ene
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~~ “Nag,
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——--
s