### Ionising Effect

• All alpha, beta and gamma emission can cause ionising effect.
• Alpha particle has high ionizing power.Beta particle has low ionizing power.
• Gamma ray has very low ionizing power.

### Deflection in Magnetic Field

• Alpha and beta emission can be deflected by a magnetic field.
• The direction of deflection can be determined by using Fleming’s Left Hand Rule.
• Beta particle deflected more compare to alpha particle due to its much smaller mass.

### Summary

 Characteristic Alpha Particle Beta Particle Gamma Ray Symbol α β γ Nature Nucleus of Helium High speed electron Electromagnetic wave Charge +2 -1 Neutral Ionizing Effect strong weak Very weak Absorted by Sheet of writing paper About 5mm of aluminium Never fully absorded. 25mm of lead reduces intensity to half Deflection in Electric Field Can be deflected Can be deflected Not deflected Deflection in magnetic Field Can be deflected Can be deflected Not deflected Speed Up to 10% of the speed of light Up to 90% of the speed of light Speed of light