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alpha rays
... consist of particles which are Helium nucleii. They are charged positive and
can be deflected by electric and magnetic fields. Their exit speed is about
107m/s.
beta rays
... consist of electrons of different speed between 108m/s and 0.999c0. Because
of their negative charge, they are deflected…

Page 2

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Beta particles have a medium penetrating power they are stopped by a
sheet of aluminium or plastics such as perspex.
Beta particles ionise atoms that they pass, but not as strongly as alpha
particles do.

Alpha particles are made of 2 protons and 2 neutrons.
This means that they have…

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