1016 CHAPTER 26: Nuclear Chemistry
TABLE 26-4 Emissions and Half-Lives of Members of Natural Radioactive Series*(a)^238 U Series (b)^235 U Series (c)^232 Th Series*Abbreviations are y, year; d, day; m, minute; and s, second. Less prevalent decay branches are shown in blue.
(^23892) U
(^23490) Th
24.1 d
(^23491) Pa
6.75 h
(^23492) U
2.47 105 y
(^23090) Th
8.0 104 y
(^22688) Ra
1.60 103 y
(^22286) Rn
3.82 d
(^21884) Po
3.05 m
(^21482) Pb
26.8 m
0.04%
21885 At
2 s
(^21483) Bi
19.7 m
(^21081) Tl
1.32 m
(^21082) Pb
20.4 y
(^21083) Bi
5.01 d
(^20681) Tl
4.19 m
≈100%
21084 Po
138 d
(^20682) Pb
99.96%
(^21484) Po
1.6 10 ^4 s
4.51 109 y
(^20782) Pb
(^21986) Rn
4.00 s
(^21584) Po
1.78 10 ^3 s
(^21182) Pb
36.1 m
5 10 ^4 %
21585 At
10 ^4 s
(^21183) Bi
2.16 m
(^20781) Tl
4.79 m
99.7%
21184 Po
0.52 s
(^23592) U
(^23190) Th
25.5 h
(^23191) Pa
3.25 104 y
(^22789) Ac
21.6 y
(^22387) Fr
22 m
98.8%
22790 Th
18.2 d
(^22388) Ra
11.4 d
7.1 108 y
(^20882) Pb
(^21684) Po
(^21282) Pb
10.6 h
0.014%
21685 At
3 10 ^4 s
(^21283) Bi
60.6 m
(^20881) Tl
3.10 m
66.3%
21284 Po
3.0 10 ^7 s
(^23290) Th
(^22888) Ra
6.7 y
(^22889) Ac
6.13 h
(^22890) Th
1.91 y
(^22488) Ra
3.64 d
(^22086) Rn
55.3 s
0.14 s
1.41 1010 y