A radioactive iodine uptake (RAIU) tests the function of your thyroid gland, which helps regulate your metabolism. It works by measuring how much radioactive iodine is absorbed by the thyroid gland, ...

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Radioactive iodine (RAI) therapy is a type of treatment for an overactive thyroid, hyperthyroidism, and certain types of thyroid cancer. The term "radioactive" may sound scary, but it is a safe and ...

Radon is a radioactive gas that comes from soil and can accumulate indoors. It has no odor or color but is the second leading ...

Naturally occurring radioactive elements are substances whose atomic nuclei are unstable. To become stable, these nuclei spontaneously break down, or decay, by releasing energy in the form of ...

The U.S. has embarked on the largest and most expensive nuclear build-out ever. The U.S. military says it is necessary to replace an aging nuclear arsenal. But critics fear the risks. This article is ...