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-Helium nucleus
-+2 charge, 4 mass
-MOST ionising
-LEAST penetrating
-can be stopped by a few mm of paper
-fast moving electron
- -1 charge, 1/2000 mass
- medium ionising
- medium penetrating
- can be stopped by a few mm of Al
- EM wave
- no charge, no mass
- LEAST ionising
- MOST penetrating
- can be stopped by a few cm of lead + a few m of concrete
-4 mass number
-2 atomic number
mass number no change
+1 atomic number
+1 mass number
no change in atomic number
