Produced in radioactive decay or electron-positron annihilation, they are emitted in namesake bursts when stars collapse to form black holes.
They are used both to change the color of topaz from white to blue and in sterilization for their ability to penetrate and alter living tissue. Produced in radioactive decay or electron-positron annihilation, they are emitted in namesake bursts when stars collapse to form black holes. FTP, name this type of high-energy electromagnetic radiation with a shorter  wavelength than x-rays, named for the third letter of the Greek alphabet.
They are used both to change the color of topaz from white to blue and in sterilization for their ability to penetrate and alter living tissue.
gamma rays