Table If1.
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
Mo99-7.99m
66 hours
12
Te 132_1132
77 hours
8
Ru 103-Ry103
40 days
Rul05-Ryl05
36 hours)
Rul06-Rp106
+ 3
1 year
Ba!40_17,4140
12. 8 days
2
Cel4i_pyi4l
33 days
2
Zr95-Np95
65 days
1
285 days
<1
Cel44.py144
100+
1)
Data from Lowman, (1960); average value for six samples collected
less than 48 hours post shot; fallout from one detonation, Rehoboth
survey, (1958)
2)
Half life of daughter