Radioactivity of Marine Organisms
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GULF OF SIAM) ____.
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PALAU
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GUAM
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RESTS R TAS ZAM THROM SK ORI Sr Tage HL OLY SORH SSeS oe sar LAReOUNgr sen oegosri ge —
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to 35 per cent
fhe percentage error was estimat-
Guam
x&
*
Sample type
Date collected
(surgeonfish)
muscle
:
B
.
unknown dates of origin.
The best
source of information about decay rates that are
most like the Guam and Palau samples is Bonham
(1959), who has determined the gross beta decay
rates for 106 types of samples from the Eniwetok
area for periods up to seven years.
However, because of within-sample and between-sample variation,
Number of Potassium Manganese
specimens
~40
~54
liver
April 4, 1959
October 6,
1959
6
liver
January 8,
1959
4
3
4+1
.
~
July 29, 1959
October 7, 1959
6
7
78+ 11
54% 13
liver
November 3,
1959
6
91+
2
1959
10
muscle
September 29,
1959
10
3+
1
adney
kidney
kidney
September 29, 1958
April 14, 1959
September 28, 1959
7
1
3
(Tridacna clam)
ney
October 21,
(goat fish)
(Tridacna clam)
~
a
Cobalt
-57
Cobalt
-60
Zinc
-65
Zirconium Silver
-95
-110m
1
28 + 17
liver
liver
(spiny lobster)
Palau
E
-
Nuclide+ identified by gamma spectrometry in single samples from Guam, Palaw and Gulf of Siam, 19581959. (Vaiues in terme of micremicrocuries per gram of wet weight and corrected to date of collection,)
(spider snail)
%
¢
&
.
Palau, and the Gulf
with different,
-1.5 for samples «.:ie:ted prior to the arrival of
the Hardtack feliout and -1.4 for later samples.
Area
£€
A reliable correction factor for decay was
difficult to derive either empirically fromother
data or theoretically from consideration of the
composition of fallout because the nuclides present
in the samples were a mixture of unknown nuclides
ed from decay curves that were arbitrarily selected after inspect.or of 19 decay curves for these
data and also deca. .urves of Bonham (1959). Ona
log-log plot the s:upes of the selected curves were
Table 1.
»
9
Figure 3.
Gross beta activity of plankton from Guam,
of aiam, 1958-1959, based on single observations.
ing the sample. This interval averaged 247 days
for the first collection, 161 days for collection
II, and 38 to 78 days for the other four collect_ ions. Therefore, «wii reported values are low and
by an amount that is estimated to range from 12
F
180 +
357%
207%
~
8
5
3
?
20+
&%
2+
59+
3
4+
~
231%
109%
25
~
3
2
2b
~
3
19%
104
1
1
~
?
16+ 1
114 1
294+ 20
57+
20%
50+
63+
40
1
1
7
:
C
~
2
1003 + 31 2340 + 30 275 + 19
~
~
~
12+ 2
5+ 1
85 + 20
137 + 12
~
5
30
2
22 + 1
~
30+
~
6
Gulf of Siam
© gamma emitting nuclides other than Potassium-40 identified in the six samples examined which included:
@uscle (Epinephelus),
fish
Ss.
(Dictyota), and p ankton. 11 ver (Katsuwonus)
, clam kidney (Tridacna), clam soft
parts *° (Arca), alga °
*
1
95 per cert error
in net count; E 95 7 1.96 (Ns/t + Nb/t, 17? ; from U. S. Public Health Service Radiological
Beaith Handbook,
1960.
2
Approximate
standard for ai teen sed upon decay scheme for silver-110m and efficiency factor for cesium-137.
Without a
in sample
50
fish
r-110m Compton correction factors not calculated and therefore estimates of other radionuclides
#150 are approximate.
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