11.   But the rising costs and the danger of highly radioactive plutonium have led other industrialized countries to cancel such programs.

12.   For such a test, the amount of radioactive plutonium in a nuclear bomb is reduced to under a critical threshold for an explosive nuclear chain reaction.

13.   Highly radioactive plutonium is stored and made into pellets at Tokaimura.

14.   Highly radioactive plutonium is stored and made into pellets in other buildings at the same compound.

15.   New Zealand wants formal assurances from Japan that there are no plans to ship radioactive plutonium through its waters.

16.   Other countries such as the United States have scrapped the technology, citing the danger of the highly radioactive plutonium used for fuel.

17.   Such tests are not prohibited by the international Comprehensive Test Ban Treaty because the amount of radioactive plutonium used is not enough to create a nuclear explosion.

18.   The Pacific Teal is carrying radioactive plutonium waste from France to Japan.

19.   The Paducah plant has been the focus of an investigation concerning the exposure of plant workers to radioactive plutonium and neptunium during the Cold War years.

20.   The soldiers were looking Friday for tiny capsules of radioactive plutonium fuel that could have fallen in southwestern Bolivia or northern Chile, the government said.