Gamma ray

Astronomers have observed the brightest flash of light ever seen, from an event that occurred 2.4 billion light years from Earth and was likely triggered by the formation of a black hole.

A "highly dangerous" radioactive material that went missing in Iraq has been found dumped near a petrol station in the southern town of Zubair, environment ministry spokesman Ameer Ali said on Feb. 21. 

The levels of gamma radiation in air are within normal and pose no threat to public health in Serbia, the Agency for Ionizing Radiation Protection and Nuclear Safety of Serbia released on Monday.