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.

radiationelectromagnetic radiationattenuationtransmissionscatter radiationradiation absorption
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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.

electronradiationelectromagnetic radiationionizationexcitationattenuationbremsstrahlung
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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.

protonneutronelectronradiationelectromagnetic radiationparticle radiation
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