Minimum Ionizing Particle
When a fast charged particle passes through matter, it ionizes or excites the atoms or molecules that it encounters, losing energy in small steps. The mean rate at which it loses energy depends on the material, the kind of particle and also its momentum. In practical cases, most relativistic particles (e.g., cosmic-ray muons) are minimum ionizing particles.
Read more about this topic: Stopping Power (particle Radiation)
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