# Radiation Units & Calculations - Video Lesson

Hey, guys. This short lecture is on radiation units and calculations. So there's lots of units and measurements and formulas associated with radiation, but fortunately, all of these have very specific relationships with each other. So here's an example of all of those measurements, units, and formulas. We'll look at these all in the context of practice problems, but just a few things to point out. The measurement of exposure is actually a way of measuring the ionizations in air. And there's no special unit for that. We simply calculate it as the number of coulombs per kilogram. A related measurement is air chroma. And air chroma, instead of measuring the number of ionizations at air, air chroma measures the energy of those ionizations in air. In fact, Kerma, that word is actually an acronym, which stands for kinetic energy released per unit mass. Air Kermit is measured in units of gray, and one gray is equal to one joule of energy per kilogram of mass. Once we start moving into

## Lesson Quiz

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