Table I.
Radioisotopes Present in Plankton Collected soon after
Fallout
Per cent of
Isotope
Half life
total radioactivity
Bomb debris
Np 239
2.3 days
69
y237
6.8 days
3
Fission products
Mo29-T¢99™
66 hours
12
Te 132_7132
77 hours
8
Ru 103-Rpt03
40 days
Rul05-Rpl05
36 hours?)
Ru106-Ry106
‘
3
1 year
Ba!40.1,,140
12.8 days
2
Cel4i-p,yi4l
33 days
2
65 days
]
285 days
<1
Zr95-Nb95
|
Cel44_pyl44
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