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
y237
6.8 days
3
Fission products
Mo28_ 729m
66 hours
12
Te 132.1132
77 hours
8
Ru103-Rp103
40 days
Rul05-Rpyid5
38 hours”)
3
Ru106- Ry106
1 year
Ba!40-1,,140
12.8 days
2
Celti_p,/41
33 days
2
Zr95-Np95
65 days
1
285 days
<1
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