1) ancient rocks emit radiation? 2)radioactivity is when a subtance emits or gives off alpha ,beta or gamma radiation 3)coal is slightly radioactive? 4)small doses of gamma radiation can be used to treat cancer 5)gamma radiation can be used to kill cells 6)smoke detectors emit radiation 7)carbon dating reliers on the use of radioactive materials 8)gamma Ray's arrive from the sun 9) radiation can caused celcular damage?
