15. Atomic Structure
Published on: 22/06/2026
Atomic structure: the foundation of radiation physics. Learn how protons, neutrons, and electrons determine how radiation interacts with matter.
RTPhysics Concept Review
Radiation Therapy Physics
Concepts Review Blog
Sara Lorraine Gill, MSRS, CMD
Medical Dosimetrist and Educator
2. What is matter
Published on: 11/02/2026
What is matter? Matter is anything that has mass and occupies space. That means everything around us is made of matter. Regardless of size, it all counts because it takes up space and has mass and therefore weight.
RTPhysics Concept Review
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