They had been interested in thorium -- a radioactive element that can fuel nuclear reactors but not be processed into weapons.

VOA: special.2010.10.15

Radioactive particles travel in the wind and get absorbed into soil with the help of rain and snow.

VOA: special.2011.03.29

World War Two ended. Enrico Fermi had been the first to use a neutron to produce the radioactive change of one element to another.

VOA: special.2009.06.14

On Tuesday, Chinese officials reported low levels of radioactive iodine-131 in areas of southeastern China.

VOA: special.2011.03.30

But people exposed to high levels of radioactive iodine can get thyroid cancer.

VOA: special.2011.03.30

Some medicines,like Prussian blue pills, can help expel radioactive elements from the body.

VOA: special.2011.03.30

It was an attempt to cool the highly radioactive fuel rods from overheating.

VOA: special.2011.03.19

The first HEPA filters removed radioactive particles from the air.

VOA: special.2009.07.14

But it depends on the depth of the radioactive material.

VOA: special.2011.03.29

He won for producing new radioactive elements beyond uranium.

VOA: special.2009.06.14

The pills flood the thyroid gland with non-radioactive iodine.

VOA: special.2011.03.30

But radioactive waste is a serious unresolved issue.

VOA: special.2011.03.18

Florbetapir is a radioactive coloring agent.

VOA: special.2011.02.08

So,yes,there is a threat particularly of the use of radioactive material, although we have no specific evidence indicating any capability at this time."

VOA: standard.2009.05.01

But the acquisition of radioactive material for a so-called 'dirty bomb,' which is radioactive material that is dispersed with a conventional explosive device, that is not that challenging.

VOA: standard.2009.05.01

"Something else, which we hope does not happen very often, but which happens from time to time are the accidents which can release huge amounts of chemicals or radioactive-during Chernobyl, the radioactive things.

VOA: standard.2009.03.23

Days after signing a deal to cut U.S.and Russian nuclear arsenals, President Obama hopes to strengthen global resolve to safeguard nuclear stockpiles and keep radioactive materials out of the hands of terrorist groups and rogue states.

VOA: standard.2010.04.11