What is an alpha particle made of
Helium nucleus
2 protons 2 neutrons
What is a beta particle
Fast moving electron
Beta decay
A neuron decays to make a proton and electron
The electron exits the nucleus as a beta particle and the proton stays in the nucleus
What is gamma radiation
Electromagnetic wave from the nucleus
Charge on an alpha particle
2+
Charge on a beta particle
-1
Penetrating meaning
Able to pass through matter
Most penetrating radiation
Gamma
Least penetrating radiation
Alpha
Types of radiation in order of ionising power
Alpha beta gamma
Material that stops alpha
Paper
How far can alpha travel
A few centimetres
Material that stops beta
A few mm of aluminium
How far can beta travel
One meter
Materials that stop gamma
Thick lead or concrete
Which radiation cannot penetrate the skin
Alpha
Why is alpha dangerous if ingested
Highly ionising so can cause mutations
