Proton ionizing penetration
This includes atomic nuclei, electrons, muons, charged pions, protons, and energetic charged nuclei stripped of their electrons. When moving at relativistic speeds these particles have enough kinetic energy to be ionizing, but relativistic speeds are not required. For example, a typical alpha particle is ionizing, but moves at.
What Is Ionizing Radiation?
Description:I think Sameer gave a nice answer. I would repeat some of the things in different language. The neutrons can "penetrate", means that there are not too many obstructions in its path. Neither the electrons nor the nuclei. You can use imagination to understand this. When a particle enters a medium, it faces a cloud of electrons.