Lecture 34

Health Effects - I

 
Behaviour of Betas-I
  • Unlike alpha sources that emit mono-energetic particles, Betas are emitted with a continuous spectrum.
  • However the interaction of Betas are similar.
  • The specific ionization of betas are less than that of alphas.
  • It has been found that the specific ionization varies exponentially with distance
                                                         
  • μ/ρ is almost a constant for most materials.
  • Based on Al measurements, an empirical formula given by Lamarsh is
                                                           
  • Similarly Range Rmax is correlated as
                     

Emax < 2.5 MeV
Emax > 2.5 MeV

                       Rmax ρ in g/cm2,   Emax in MeV.