
👀 Units have always been confusing and you usually just "make it work" by writing in what you think they should be, once you get the numerical answer for the problem.
😰 Sitting in physics class right now and things are not as clear as you'd like them to be.
💪 About to start radiation therapy or dosimetry school and are feeling a little apprehensive about physics & math. You want to feel more prepared before your first class.



Each lesson pairs a short, focused video with a practice worksheet and full solution walkthrough.
Sara shows different ways to solve problems (when applicable) and how to format them to make solving them more organized and clear.
Sara has the calculator on screen when solving worksheet problems.
Includes a single page "cheat sheet" PDF with units & conversions.
LESSON 1
Review of units, systems of units & combinations of base units.
Lesson: 17 minutes
LESSON 2
Metric system & prefixes, converting units within and across different systems of units.
Lesson: ~ 18 minutes
SOLUTIONS VIDEOS
Watch Sara solve every problem on every worksheet!
Solutions: ~ 78 total minutes of video

Sara Gill, MSRS, CMD, is a senior medical dosimetrist with 20 years of clinical and teaching experience at a large academic hospital. She has taught radiation therapy physics in the college classroom for years, and RTPhysics was born from her knowledge of what those students needed. Her approach is plain language, every step shown, and a genuine love for finding the explanation that finally makes it click.
If this is you, then this course would be a good fit:
* I'm mostly okay with math
* Units were always frustrating
* I get mixed up when converting units
Sara recommends this course if you're generally okay with the math, but dealing with units was always a frustration point.
If you find yourself struggling with math quite a bit, in addition to dealing with units of measurement, then Sara recommends purchasing the Math Foundations + Units of Measurement bundle, which covers all the math you'll need for radiation therapy physics.
Get a sneak peek into Sara's teaching style and watch one of her Math Foundations lessons on Youtube and grab the worksheet that goes with it, here. In the lesson, Sara explains every step of the calculation process and includes a summary at the end.
1 year from your date of purchase. Need more time? Contact [email protected] before your access expires to arrange an extension for a small fee.
Due to the digital nature of the product, I offer a 7-day money-back guarantee. If you're not satisfied, email [email protected] within 7 days of purchase and you will receive a full refund, provided only ONE module has been accessed.
Email [email protected].
All lessons and solution walkthroughs are pre-recorded video lessons, available instantly upon enrollment. Watch on your own schedule, pause and rewind as many times as you need. There is also a text summary of each lesson in each module, which may include relevant screenshots from the videos for quick review.
Yes — all practice worksheets are available to download so you can use them digitally on a laptop or tablet* or print them and work through problems by hand on paper.
*Sara loves the app Notability for importing PDFs and writing directly onto them using a tablet and stylus.
Every problem in every worksheet has a complete video walkthrough so you can see exactly how each one is solved. If you have additional questions, you can reach me at [email protected].
You need very basic math skills such as multiplying & dividing numbers and powers of 10. This course is designed for students at all levels. Whether you feel confident in some areas and shaky in others, or want a complete review from the ground up, this course will review the basics of units, building in complexity, allowing you to work at your own pace.
You'll have to enroll to see! ;)
If math is a struggle point, Sara recommends the Math Foundations Course, which INCLUDES Units of Measurement!
© Copyright 2026 RTPhysics | PRIVACY POLICY | TERMS & CONDITIONS