Table 1.
Per Cent Abundance
and Relative
Maximum
Permissible
Concentration of Fallout Radioisotopes of Biological Interest
Per cent abundanceat: 1)
Fission
One
One
products
week
month
589
2.1
590
“oe
90
wee
y?l
2.4
zr95
| One
year
6.7
Relative
Ten
years
|
MPC
Half lite?)
values?)
2.7
---
50 days
“++
1.8
21.8
28 years
1
wee
1.8
21.8
64 hours
200
7.6
3.9
---
58 days
300
2.5
8.2
7.3
---
65 days
600
Nb?5
---
4.1
15.0
---
35 days
1, 000
Ru106
---
oee
2.4
---
365 days
100
Rh 106
-7-
---
2.4
<---
2 hours
yi3l
6.3
<---
---
8 days
20
3.7
100
*
cal8t
e+e -
1.5
18.2
27 years
200
Bal3im
---
1.5
18.2
3 mins.
*
--.
1) Hunter and Ballou. (195))
2) Strominger, Hollander and Seaborg(1958)
3) MPC values relative to 5r99: based upon values from
69 for which MPC for Sr99 ig 1078 pelec
*
A short-lived daughter for which hazard is negligible in
comparison to hazard for parent
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