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(RAY-don)
![](https://webarchive.library.unt.edu/eot2008/20081104020223im_/http://www.nci.nih.gov/images/spacer.gif)
| A radioactive gas that is released by uranium, a substance found in soil and rock. Breathing in too much radon can damage lung cells and may lead to lung cancer. |
Previous Definitions: | radiopharmaceutical, radiosensitization, radiosensitizer, radiosurgery, radiotherapy | Next Definitions: | Raftilose Synergy 1, raloxifene, raloxifene hydrochloride, raltitrexed, randomization |
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