Table ILI.
Radioisotopes Present in Plankton Collected soon
after Fallout
Isotope
Half life
Per cent of
total radioactivity
Bomb debris
Np239
2.3 days
69
u237
6.8 days
3
Fission products
Mo99-T.99m
66 hours
12
Te 132-7132
77 hours
8
Ru103-Rp103
40 days
Rut95_Rp,105
36 hours?)
Ruy 106. Rp 106
3
1 year
Bal40-7,a140
12.8 days
2
Cel4l_p, 141
33 days
2
Zr95-Nb95
65 days
1
285 days
£1
Cel44_p,144
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