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 isotoves in each fraction are presented in the Project
2 6b report.
TABLE 3.15 ~ Per Cent of Total Activity of Shot l
Size Graded Samples from How Tsland*
NMD of
Fraction
puke
1.l
32
22
27
38
56
69
79
98
103
x *
160
171
195
> 225
TOTAL
Ht
3-10
Weight
(gm)
Total
Activity
Per Cent
of Fracof
tion in
Total Weight Arbitrary
sett
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 e662
30.608
9447
3419
0.366
3.02
1.95
3 36
1.71
1.31
1.33
211
2026
2047
3.21
64020
100
Per Cent of
Total
Activity in
Fraction
Units at
D# 7 Days
{|
731
2029
0.323
2045
1.96
3022
1.16
1.30
0.950
1.445
1.56
1.58
1.98
13.5
41.0
17.8
§ 59
0.788
598
4078
7.86
283
3e17?
2032
3.54
3.81
3-86
4.83
32.9
100
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
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-siza analysis, were mixed
and sieved through 420, 210, 149, 105, 74 and 44 micron sieves.s (Not
enough fallout was collected from Shots 4 and 6 to make these analyses.
Rach fraction from each shot was separated into two groupse
90