are based mostly on activity which has condensed or become connected
to Pacific Island coral or sand particles and the results may not be
applicable to other types of environment.
Activity information for
each of several isotopes in each fraction are presented in the Project
26b report.
TABLE 3.15 ~ Per Cent of Total Activity of Shot l
Size Graded Samples from How Island*
NUD of
Fraction
price
Per Cent
of
22901
0.975
0.112
0.923
0.597
1.031
0.400
0.522
0.408
0.646
0.691
0.757
0.983
19 662
30.608
Per Cent of
of Frac~
tion in
Activity in
Fraction
Total Weight Arbitrary
teicke
lel
32
22
27
38
56
69
79
98
103
160
171
195
> 225
TOTAL
9047
3019
0.366
302
1.95
3 36
1.71
1.31
1.33
2ell
2226
2047
3-21
64420
100
Total
Units at
D/ 7 Days
,
731
2029
0.323
2045
1.96
3022
1.16
1.30
0.950
1.45
1.56
1.58
1.98
1345
41.0
17.8
5 59
0.788
5298
4e78
786
2483
3017
2032
354
3-8
386
4.83
32.9
100
x *
Project 2.4b results 12
Project 2.4b reports the
fractions as the mean volume
diameter of the particles, not as the number mean diameter
st
3.10
Weight
(gm)
Total
Activity
Both radioactive and non-radioactive particles in the
fraction
PARTICLE CHARACTERISTICS
The average density of all particles was about 2.6 g/cc. The
index of refraction of all Shot 1 particles was about 1.544.
The fallout material from Shots 1, 2, and 3, which remained
after the removal of samples for particle-size analysis, were mixed
and sieved through 420, 210, 149, 105, 74 and 44 micron sieves. (Not
enough fallout was collected from Shots 4 and 6 to make these analyses).
Fach fraction from each shot was separated into two groups.
90