77
U
92
uss U;
{uramum })
u™ Un
(uranium 11)
years
years
4.51 = 109
2484105
d.
Pa
Pa™UX, 8
a
91
A 18 minutes”
ps
Pa uz!8
&.7 hours
Th | Th, Ux,
90
‘
.
uranium X
24.1 days
a
v
y
Th™,to
(ionum)
7.52 x 104
years
Ac
a
89
‘
Ra
Ra™, Re
(radium)
&8
1622 years
Fr
a
87
}
Ra
Rn™_ Rn
(radon)
86
3.825 days
At
a
85
Po
Po™®, RaA
Po?!*, RaC’
Po”, RaF
3.05
16x 107
{(Polonium)
(radium A)
(radium C’)
Bi
Bi2!*Rac
a
83
Pb
(radium B)
minutes
The uranium series.
(radium £)
@
minutes
268
Figure 19.
Bi??? ReE
“19.7
Pp?!*, RaB
82
8
(radium C)
!
138.4 days
second
minutes
84
toni
5.01 days
8
a
po? rap |”
Pb™RaG
(radium
(stable lead
q
D
22 years
0)
Isotope)
Minor radiations are omitted.
(Modified after Friedlander, Kennedy and Miller,
1964).