Table 1.
Per Cent Abundance and Relative Maximum Permissible
Concentration of Fallout Radioisotopes of Biological Interest
Per cent abundanceat: )
Relative
Fission
One
One
One
Ten
products
week
month
year
years
sr88
2.1
6.7
2.7
===
50 days
$790
wee
aoe
1.8
21.8
28 years
1
y2
---
see
1.8
21.8
64 hours
200
y?1
2.4
7.6
3.9
---
58 days
300
zr95
2.5
8.2
7.300
---
65 days
600
Nb295
~--
4.1
15.0
---
35 days
1, 000
Ru 106
~-
aie
2.4
---
365 days
100
Rh106
~--
“++
2.4
---
2 hours
*
yi31
8.3
=e-
8 days
20
Cai37
---
=
1.5 |
18.2
27 years
200
Bal3?m
.--
—---
1.5
18.2
3 mins.
*
3.7
---
MPC
Half life?)
values”)
100
1) Hunter and Ballou (1951)
2) Strominger, Hollander and Seaborg (1958)
3) MPC values relative to Sr9°: based upon values from
69 for which MPC for Sr29 ig 1078 ye/ce
*
A short-lived daughter for which hazard is negligible in
comparison to hazard for parent
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