142
topendix Table 3.
Alpna Activities of the Bravo Crater "Standard"
(
Nuclide
Activity
pCi/fag
+
2S.D.
24 an
37.38 +
.46
239,2405,,
70.14 + 4.7
238,
238)
234)
226p4
aa
4.96
1.96
2.45
1.06
1.06
+
+
+
+
¢
.46
53
.61
.17
.17
21854
21456
1.06 +
1.06 +
117
17
21054
2.93 +
.96
Total
124.1
+
4.9
thicknesses greater than 4.58 n/c was thus used to calculate the total
alpha radioactivity in the “standard” semple.
To maasure the total alpha radioactivity of the many lagocn sediments,
only one sample was prepared for ezch station.
To avoid needing to
measure the concentrations of the members of the 233 li decay series in
each sample, the imean range was computed only for the 12 lagoon sediments
for which these data were available; the range in these samples were then
plotted against the total alpha radioactivity in each sample to derive
an average dependence of the mean range to the total alpha radioactivity
present in the various samples (Appendix Figure 2).
In the high activity
samples the range is primarily a function of the Pu and Am radionuclides.