Transmission of Beta Particles

Beta particles have a continuous energy spectrum extending from zero energy up to maximum kinetic energy (see Sec. 3.7.3). If the transmission experiment shown in Fig. 4.5 is repeated with an incident beam of jS particles, the result will look as shown in Fig. 4.11. The number of betas N(t) transmitted through a thickness t is very closely represented by 

The value of has been determined experimentally as a function of the maximum beta energy and is given by 

Example 4.13 What fraction of 2-MeV betas will go through a single A1 foil of thickness 0.1 mm  

Therefore, 81 percent of the betas will go through this foil. 

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