Radiation Therapy Physics

Concepts Review Blog

Sara Lorraine Gill, MSRS, CMD

Medical Dosimetrist and Educator

18. Transmission & Attenuation

18. Transmission & Attenuation

Sara Lorraine Gill
Published on: 06/07/2026

Radiation can transmit, scatter, or absorb as it passes through matter. Learn how attenuation works — and why it's essential to understanding dose delivery in radiation therapy.

RTPhysics Concept Review
17. Ionization & Excitation

17. Ionization & Excitation

Sara Lorraine Gill
Published on: 06/07/2026

Excitation vs. ionization: two ways radiation interacts with atoms. Learn how each process works and why ionization is the key to understanding how radiation deposits dose in tissue.

RTPhysics Concept Review
16. Radiation Introduction

16. Radiation Introduction

Sara Lorraine Gill
Published on: 29/06/2026

Not all radiation is the same. Learn the key difference between particle and electromagnetic radiation — and why it shapes how we image, treat, and think about dose.

RTPhysics Concept Review

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