Table 1.
Per Cent Abundance
and Relative
Maximum Permissible
Concentration of Fallout Radioisotopes of Biological Interest
Fission
Per cent
abundance
products
week
One
One
gr89
§r90
y90
yy!
2.1
----2.4
---
Half life?)
6.7
----7.6
2.7
1.8
1.8
3.9
--21.8
21.8
---
50
28
64
58
4.1
15.0
-=-
35 days
6.3
3.7
---
---
---
Ru 106
Rh106
-----
i131
Bal3?m
---
8.2
-------
Ba1l40
Lal40
8.8
9.4
10.8
12.5
prl44
Pm 14?
-----
2.0
---
Cel44
Ten
years
2.5
Csl37
One
Relative
year
zr95
Nb95
month
at:))
~--
2.0
7.300
2.4
2.4
1.5
1.5
-----
26.5
26.5
5.7
---
days
years
hours
days
65 days
100
1
200
300
600
1, 000
-----
365 days
2 hours
18.2
27 years
200
~----
13 days
40 hours
300
200
17 mins.
950 days
*
2,000
---
18.2
---
--15.8
Non-fission
products
Mn°4
Fed
Feo9
Co®?
C08
C060
zn65
8 days
3 mins.
285 days
290 days
100
*
20
*
100
1, 000
950 days
8, 000
270 days
71 days
5, 000
1, 000
245 days
1,000
45 days
1900 days
1) Hunter and Ballou (1951)
2) Strominger, Hollander and Seaborg (1958)
3) MPC values relative to Sr99; based upon values from
*
MPC
values9)
Handbook 69 for which MPC for Sr90 ig 1076 pe/ce
A short-lived daughter for which hazard is negligible
in comparison to hazard for parent
600
500