# Comparision of Alpha Particles, Beta Particles And Gamma Rays

Show/Hide Sub-topics (Nuclear Physics | A Level)

Alpha ($\alpha$) rays Beta ($\beta$) rays Gamma ($\gamma$) rays
Nature of radiation Helium Nucleus ($He^{2+}$) Electron ($e^{-}$) Electromagnetic radiation
Ionising Power High Low Very low
Penetrating Power Very low (Stopped by sheet of paper) Low (Stopped by thin sheet of aluminium) Very high (Reduced to half by 1 or 2 cm thick lead)
Effect of magnetic field Deflected with large radius

(Upwards when magnetic field is into page)