|
- 22in the same localities, indicating that the algae had selected some of
the longer-lived radionuclides.
analyses have
Unpublished results of radiochemical
shown that Cel44-p, 144
Zr99-Nb?>,
and Ru!96-py, 106
are the predominant radionuclides present in algae samples collected
shortly after a nuclear detonation.
The decay rate of water samples collected in July and September,
1954,was slower than that for the algae, but because of the high per-
centage counting error in the last counts of radioactivity in water
samples, these data
Table 7.
are in douht.
Decay rates of algae and intertidal water collected at Belle
Isiand, May 1954 to March 1955, expressed as the negative
slopes of logarithmic plots: A; = A,t™.
Dates of collection
Sample
Halimeda
5/16-22
1.3%
6/i-19
1.3
1954
7/5
9/7?
13
Caulerpa
Spyridia
1. 2*
1.2
Udotea
1.2"
1.3%
1.8*
1.8"
Intertidal
water
1.2
1075
11/30
ll
1.3
1.2
1.1
1.1
1.3
1.2
1.1
1.5*
1.2%
1.2*
1.0%
1.1
4/18
=
Activity atday
A;
=
Activity at day 1
t
=
Time in days
-x
=
Slope
1.0
1.2
0.8*
1.2
*Two or more samples with identical slopes
A,
1955
2/75
t
ayo
1.2
=