Electron Range and Electron Stopping Power

A. The electron stopping power of a homogeneous multielement material is defined as 1 ρ   dV ds https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780203742433/53e9912e-dfc3-42b1-91b1-4eaf447a0f76/content/eq6.tif"/>