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Radiation is detected by... Geiger-Muller tubes or photographic films.
Activity The number of radiation particles emitted per second.
The unit of activity Becquerels (Bq)
Alpha articles What is it?
2 protons and 2 neutrons emitted from the nucleus
Range in air?
4cm
Stopped by?
Paper
Ionising power?
High
Mass number of 4 and atomic number of 2.
Beta particles What is it?
An electron emitted from the nucleus
Range in air?
20cm
Stopped by?
Aluminium
Ionising power?