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4. Interaction Coefficients and Related Quantities

Interaction processes occur between radiation and matter. In an interaction, the energy or the direction (or both) of the incident particle is altered or the particle is absorbed. The interaction might be followed by the emission of one or several secondary particles. The likelihood of such interactions is characterized by interaction coefficients. They refer to a specific interaction process, type and energy of radiation, and target or material. The fundamental interaction coefficient is the cross section (see Section 4.1). All other interaction coefficients defined in this Report can be expressed in terms of cross sections or differential cross sections. Interaction coefficients and related quantities discussed in this Section are listed in Table 4.1.