Uranium is naturally radioactive.
You can just put something in the sentence that is going to be radioactive that's all.
That area will be radioactive for a long, long time.
You have to use a microscope to see the radio active fuel
"The radioactive decay of certain unstable isotopes is used to calculate the age of objects."
"Marie Curie was a pioneer of radioactive research".
Cancer usually requires some form of radioactive treatment, such as one of the most infamous methods, chemotherapy.
My nerdy brother wants to start a radioactive dating website! The use of radiometric, or radioactive, dating was initiated in 1907 by Bertram Boltwood.
A radioactive element is one that discharges radiation. Uranium is a radioactive element. A radioactive element is very dangerous if you don't have protective clothing. You should never go near a radioactive element.
Francium is a "radioactive" element.
The X-Ray machine is radioactive
Hassium is a synthetic element that is highly radioactive and has no practical applications outside of scientific research.
The radioactive element was observed by many scientists around the world.