Table III.
Radioisotopes Present in Plankton Collected soon after
Fallout
Per cent of
Isotope
Half life
total radioactivity
Bomb debris
Np239
2.3 days
69
u237
6.8 days
3
Fission products
Mo29- 729m
66 hours
12
Te 132_ 1132
77 hours
8
Rul03-Rp103
40 days
Ru105- Rpl05
36 hours”)
Ry 106- ppl 06
3
1 year
Ba! 40-1,,140
12.8 days
2
Cel4#i_p,i41
33 days
2
Zr95 -Np95
65 days
1
285 days
<]
Cel44.pyi44
100+
1)
Data from Lowman, (1960; average value for six samples collected
less than 48 hours post shot; fallout from one detonation. Rehoboth
survey,( 1959
2}
Half life of daughter