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

Select target paragraph3