oe
+6
’
4
4
yuysical properties one would expect {t to behave much like strontium and some indication
of this is shown in Table 2.
It is kuown that the size of fallout particles are related to the distance from the
explosion at which the fallout occurs; and that the mean particle size in general decreasas
as distauce increases. it is most likely therefore that the particles arriving at Station Y¥ - 3
(80 miles from ground zero) were larger than those arriving at Station Y - 6 (180 miles
from ground zero at the time of arrival). However, no direct measurements were made,
.
.
and numerical estimates of particle size require extensive qualification beyond the scope
and classification of this paper.
me
4
DISCUSSION
tentteed
In Table 1 it will be noted that each of the classes as well as each type of organism
in Sample Y - 6 shows the remarkably similar specific activity when reierred to dry
TABLE 2
ANALYSIS AND COMPARISONS
Fraction
Gross Activity
Rare Earths
Bal@
sr#¥.¥
ars
NbM
RW
Undetermined
Radioohemical Analysis of Separated Fractions of Samples Y - 8, c/min of Beta .ctivity
Water*
82,500
3,530
1,780
(410)
Solid Fractiont
Total
on
®t
320,000
97,000
646
402,500
100,530
2,420
(320,000)
1,600
89
_808
1,689
890
840
33,900
39,960
69,300
29,600
74,000
49,980
70,190
29,840
107,900
89,940
(4.5)$
(69,000)
:
Percent of Total Activity Contributed by Separated Fractions of Sample ¥ + 8
ww
Water
20.5
Solld Fraction
79.5
0.88
B41
0.44
6.40
0.16
0.02
0.22
37.2
0.21
7.20
8.43
18.4
:
'
1
3.82
12.43
Ba cee
Apparent Specific Concentration Factors of Organic Matertal Over Supernatent Water,
(e/min/gm)/(o/min/gm)
780
5,500
70
0
15,000
6,300
440
_
Comparison of the Compositions of the Activity Retained in Two Selected Organiams from
Sample { - 8. (Activity given relative to total for each organism, in
percent)
_
23.8
0.26
0.47
_
_
_
75.7
Sagitta (robusta)
_
40.8
1.2
0.60
=
=
_—
87.4
* Filtered through sintered glass.
1 Solid fraction retained by filter «mostly inorganic rem2ins).
PApproximate speciiic activity ¢,min/gm; 1.6. assummag 260 ml supernatent and 1 gram vet
plankton in the specimen.
a,
.
.
.
Copeveds ymixed)
;
weight (Column 10); whereas no comparable consistancy appearsin the activities of the
components of Sampie Y- 8. This inconsistancy possibly is related to the difference in
size of the fallout particles at the two ranges.
Becauseof the large variation in size, and presumablythorefore also in food consumption, it is unconvincing to compare activities of individuals of quite different sizes.
Amongst the possibie reference parameters in the data, dry weight would appear to offer
the best reference for such comparisons as are being p.ade here. However, it is possible
that organisms may share activities in the preserving bottle, and if this were true, cried
spevimens having properties quite different in life might appear the same in the cry weight
basis. This type of sharing is, of course, no legs interesting but obscures the vital
effects. Thore appears no wey to avoid this difficulty entirely unless biological classisi~
15
:
1
.