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1. RADIOACTIVITY
of an unstable nucleus in order to become
more stable while emitting radioactive energy
SPONTANEOUS
DISINTEGRATION
Type of Radiations
α-particle
-Particles consists of 2 protons and 2
neutrons : Helium nucleus
-Positive charge (+2)
-Travel up to 10% speed of light
-Strong ionising effect (100,000 ions per
mm)
β-particle
-Particles consists of fast moving electrons
-Negative charge (-1)
-Travel at 90% speed of light
-Weak ionising effect (100 ions per mm)
γ-rays
-High frequency electromagnetic radiation
-A burst of energy
-No particles, no mass, no charge
-Travel at speed of light
-Weak ionising effect (1 ion per mm)
Not affected by physical condition