Radioactive Decay

TheThorium Series

Element

Atomic Weight

Radiation Emitted

     

Half Life

 

Thorium

232

a

     

1.39E+10

Years

Radium

228

b

     

6.7

Years

Actinium

228

b

     

6.13

Hours

Thorium

228

a

     

1.91

Years

Radium

224

a

     

3.64

Days

Radon

220

a

     

52

Seconds

Polonium

216

a

     

0.16

Seconds

Lead

212

a

     

10.6

Hours

Bismuth

212

b

66.30%

a

33.70%

60.5

Minutes

Polonium

212

a

     

3.00E-07

Seconds

Thallium

208

b

     

3.1

Minutes

Lead

208

Stable

     

-