Radiation Biology and Safety 232 NMT . Dr.Sayed abbas Lecture 1. Introduction to Radiation. Atom. Atom. The word “atom” derives from the Greek word “atom's,” which means indivisible; an atom was the smallest indivisible component of matter .
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* Protons: are positively charged particles.
The mass of a proton is about 1,839 times greater than that of an electron.
* Neutrons: are uncharged (neutral) particles.
Protons and neutrons form the nucleus of an atom, and so these particles are also called nucleons.