Table 1.
Fission
products
sro?
Sr
y20
Per cent abundance of fission products, radiation energy, half life, critical organ
and maximum permissible concentration of fallout radioisotopes of biological interest
(1)
Per cent abundance at:
Radiation
week month year years
One
One
2.1 6.7
---
---
---
---
---
4.1
yl
ar?
2.4 7.6
2.5 8.2
Ru
206
--wae
Nb??
137
Bal37m
Ba l4o
6.3
---
------
3.7
---
~- ---
8.810.8
Lalo
9.412.5
pplad
---
Ce
pm 47
mo. 4
One
Beta
Gamma
Physical
2.7 ---
1.46
none
51 days
1.8
2.26
weak
16
.76
3.9
7.3
15.
2,4
2,4
---
21.8
21.8
1.54
36%
-----
.O4
3.5%
---
---
1.5
18.2
---
---
1.5 18.2
---
---
2.0 26.5
---
2.0
26,5
wee
He
5.7
15.8
ann
ag RA
cc
e7
Ff
54
-----
---
27
energy,
Half life
Mev
1.8
Ten
(2,3)
---
.61*
.51*
1?
1.02*
1.36*
.31*
2.97
.22
none
28 years
1.22
72
58 days
65 days
none
0.51*
.36*
35 days
1.0 years
30 secs.
8.1 days
27 years
.03*
13 days
.33*
.O3*
.06*
weak
_
Biological
(for man)
3900 days
285 days
organ
bone
(4)
MPC
(4,5)
po /ml
0.00007
="
b
>500
"
bone
0.2
50"
bone
0.004
20
kidneys
0.1
muscle
0.0015
180
2.6 mins.+ 17
40 hours
Critical
00
64 hours \ 39
66
66
(2,3)
200
"
"
'
"
35"
17 months + 20°
2.6 years 5100
1
"
one
thyroid
bone
bone
bone
0 .0000008
0.00003
0.002
1
0.04
1