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 .
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
* Electrons: are negatively charged particles.
* 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.