Radioactive elements remain in our bodies for a long time.

The people didn't realize the potential danger of using radioactive elements.

It is a very radioactive element that does not exist in nature.

So far, the tests show no contamination from radioactive elements.

Besides, the radioactive elements whose energy had driven the process were giving out.

Every radioactive element or isotope has something called a half life.

In addition, research has led to the discovery and creation of additional radioactive elements.

Some radioactive elements have uses in nuclear medicine for diagnosis treatment or research.

That water can contain materials like grease and radioactive elements.

Together with Technetium, these are the only two radioactive elements below lead.

Also in the box is a device that contains a small amount of a radioactive element.

Many of the dangerous radioactive elements in spent nuclear fuel decay away within weeks and months.

Natural radioactive elements were first isolated and examined by determined scientists.

These products are themselves radioactive elements, each with an atomic weight a little lower than its predecessor.

This article is about the property of radioactive elements.

The radioactive elements may be getting absorbed by something.

Illegal trade in nuclear material and radioactive elements must of course be fought strongly.

I is one of the major radioactive elements released from reprocessing plants.

A Geiger counter and a little bit of a radioactive element are in the room.

Additional heat may come from the decay of radioactive elements mixed with its iron.

"Well, according to the decay rate of trace radioactive elements, I'd guess these buildings are at least two million years old."

It was the first non-primordial radioactive element to be isolated.

One is if a planet has a large moon, stirring radioactive elements into the crust.

Huge areas were polluted by radioactive elements and are considered unsuitable for living.

It is an area of concentrated thorium, a radioactive element.