Self-paced study resources for radiation therapy & medical dosimetry students who are overwhelmed, under-supported, or just done piecing it together on their own. From confusion to clarity, one lesson at a time.

Because understanding radiation therapy physics shouldn't feel impossible.

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I figured out how to explain it to myself, and now I can explain it for you.

Hi, I'm Sara! I break down complex concepts into simple, step-by-step explanations with real-world examples and relatable analogies, so everything finally makes sense. With a background in education and medical dosimetry of over 20 years, I have a passion for helping students make sense of the math and physics they encounter in radiation therapy or medical dosimetry school. Let me help you in your studies and come say hi!

SO looking forward to helping you! — Sara

Sara L. Gill, radiation therapy physics educator
Sara L. Gill, MSRS, CMD Medical Dosimetrist & Educator · 20+ years

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Clarity

Short, focused lessons, taught in a way that finally connects the dots.

Confidence

Because following the steps and actually understanding them are two very different things.

Control

Your schedule, your pace, and a guided path through the material.

If you're a student who's tired of feeling lost in physics...

✴ Studying for hours but still not feeling confident...

✴ Following the steps without really understanding the why...

✴ Piecing it together from textbooks, YouTube, and scattered notes...

Or maybe you're about to start school and feel that uncertainty about how you'll do in physics...

You're in the right place!

Student taking notes

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Ready to turn confusion into clarity?

check out the resources ↓

Grab your FREE Guide

Magnification: A Review Guide

This free review guide breaks down everything you need to know about image size, source-to-image distance, and geometric relationships in radiation therapy. You’ll learn how to apply the formulas with confidence, making it perfect for exam prep or quick review before clinical practice.

Motivational Digital Paper:

Designed for students and professionals alike!

COURSES:

Math Foundations

for Radiation Therapy Physics

...with bonus Units of Measurement course!

Designed to review ONLY the math you NEED for Radiation Therapy Physics. This is a MUST if math is a struggle point. All the other courses assume you know what's in this one.

This course includes:

  • Video lessons

  • A single PDF with all relevant equations and conversions.

  • Extra practice problems with FULL VIDEO SOLUTIONS

  • Exponents, fractions, proportions, similar triangles, basic trig functions, the numbers e & pi, and natural log... plus more!

  • BONUS: Units of Measurement course!

Take a free math quiz to see if you're ready for physics!

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Units of Measurement

The ultimate review to help you set up units in your calculations correctly and gain more confidence fast.

This course includes:

  • A review of systems of units

  • Combinations of base units

  • Metric system prefixes

  • Unit conversions for all types of units

  • Cheat sheet with units and conversions on a SINGLE PDF

  • Video walk-throughs for each example

  • Extra practice problems with FULL VIDEO SOLUTIONS

Monitor Unit

Calculations

The ultimate step-by-step guide to help you set up MU calculations correctly and gain more confidence. We explain concepts first, and then solve calculations. This is a robust course designed to deepen your knowledge, and is broken into short videos so you don't feel overwhelmed.

This course includes:

  • Video review of key concepts with calculation examples

  • Both PDD & TMR calculations

  • ALL the formulas on a SINGLE PDF

  • Extra practice problems with FULL VIDEO SOLUTIONS.

  • Proof that data tables are not your enemies

  • BONUS: Linear Interpolation Module from the Math Foundations course!

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HEY, I'M SARA.

I'm an educator first, medical dosimetrist second. Let me help you build confidence as you study Radiation Therapy Physics. I put a lot of care into both the quality of each lesson and the order they're presented in. The material is designed to be clear, logical, and intentionally sequenced so that each concept prepares you for the next. I also try to explain things in multiple ways where appropriate, in order to give your brain a chance to latch onto one that makes sense to YOU.

In physics, it's the how you get somewhere that creates the clarity and reduces frustration. That matters just as much as where you end up.

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I believe anyone can improve their understanding of radiation therapy physics.

Grasping complex physics concepts, solving problems with clarity, and feeling more confident in your studies isn’t just for a select few. RTPhysics was created to make learning simpler and more approachable, with clear explanations, practical examples, and step-by-step guidance built from years of teaching experience.