31.   The radioactive elements at issue are elements heavier than uranium, produced in reactors by bombarding uranium with neutrons to make plutonium for weapons.

32.   The sestamibi technique uses radioactive elements, known as isotopes, that are designed to target a specific part of the body.

33.   They dated the antelope bones by analyzing their ratios of radioactive elements, which vary over time and so provide a kind of clock.

34.   They are created by some of the most basic physical processes of the universe, such as the decay of radioactive elements and fusion reactions that power the sun.

35.   Uranium is a radioactive element that can for refined for use in nuclear weapons or nuclear power plants.

36.   Brazil, which has large reserves of the radioactive chemical element thorium, is interested in Indian experiments in converting the substance into a nuclear fuel.

37.   But the marshy wetlands around the plant have absorbed the radioactive elements released in the blast, and are passing them outside the region through the groundwater.

38.   From tons of ore, they isolated small amounts of two highly radioactive new elements - radium and polonium.

39.   Greenpeace argues that the subsidence allowed water to seep into the blast cavity and then carry out radioactive elements.

40.   Metal plates containing about a tenth of an ounce of plutonium and americium, another radioactive element, were found Saturday by Finance Ministry agents acting on a tip.