Frequent flyers and airline crews face a higher risk of radiation exposure from the sun. The risk is greatest on flights at high altitudes, over the poles or during solar events. Radiation exposure ...

A new study highlights a critical gap: most clinical research studies that use imaging techniques such as amyloid positron ...

Experts say they might, and Osama bin Laden’s al-Qaeda terrorist network has been eager to acquire radioactive material. In the aftermath of September 11, scenarios that have particularly worried ...

Weather forecasts usually include a UV index, a measure of the intensity of ultraviolet radiation from the sun. The higher the number, the greater the risk to people. Most of the radiation that ...