Radioactive Decay

The Neptunium Series

Element

Atomic Weight

Radiation Emitted

     

Half Life

 

Plutonium

241

b

     

13.2

Years

Americium

241

a

     

426

Years

Neptunium

237

a

     

2.20E+06

Years

Protactinium

233

b

     

27.4

Days

Uranium

233

a

     

1.62E+05

Years

Thorium

229

a

     

7.34E+03

Years

Radium

225

b

     

14.8

Days

Actinium

225

a

     

10

Days

Francium

221

a

     

4.8

Minutes

Astatine

217

a

     

1.80E-02

Seconds

               

Bismuth

213

b

98%

a

2%

47

Minutes

               

Polonium

213

a

     

4.20E-06

Seconds

Thallium

209

b

     

2.2

Minutes

Lead

209

b

     

3.32

Hours

Bismuth

209

Stable

     

-