Range of Heavy Charged Particles

Range is distance, and its basic dimension is length (m). In addition to meters, another common unit used for range is kg/m (or g/cm ). The relationship between the two is 

Semiempirical formulas have been developed that give the range as a function of particle kinetic energy. For alpha particles, the range in air at normal temperature and pressure is given by 

If the range is known for one material, it can be determined for any other by applying the Bragg-Kleeman rule  

Example 4.6 What is the effective molecular weight for water What is it for air  

There are two ways to obtain the range of alphas in a material other than air and silicon  

---

W. H. Barkas and M. J. Berger, Tables of Energy Losses and Ranges of Heavy Charged Particles, NASA SP-3013 (1964). 

---