Alpha symbol
A
Alpha nature
Particle
Alpha elec charge
+2
Alpha stopped by
3-15mm air;sheet of paper
Alpha ionising power
Very good
Alpha what is it
He nucleus
Beta symbol
β
Beta nature
Particle
Beta elec charge
-1
Beta stopped by
1-3mm of Al
Beta ionising power
Medium
Beta what is it
Very fast electron
Gamma symbol
γ
Gamma nature
Wave
Gamma elec charge
0
Gamma stopped by
2.5 cm of pb
Gamma ionising power
Relatively poor
Gamma what is it
Electromagnetic radiation