# What Is Radiation? ![rw-book-cover](https://readwise-assets.s3.amazonaws.com/static/images/article4.6bc1851654a0.png) ## Metadata - Author: [[UCSF Radiology]] - Full Title: What Is Radiation? - Category: #articles - Summary: We are exposed to radiation every day from natural sources like the sun and soil, as well as man-made sources such as X-rays and CT scans. X-ray images help doctors see inside the body and are measured in units like milliSieverts (mSv). For example, a chest X-ray exposes you to about the same amount of radiation as you would receive from your environment over three days. - URL: https://radiology.ucsf.edu/patient-care/patient-safety/radiation-safety/what-is-radiation ## Highlights - Radiation is any energy that comes from a source and travels through space, such as light or heat. ([View Highlight](https://read.readwise.io/read/01jcsgs71a502n26tsbvhn5tgj))