However, Georgia is a former member of the Soviet Union, and world leaders have been concerned about the security of Soviet nuclear weapons since it broke up in 1991.
"Officers of Georgia`s State Security Service detained three citizens of Armenia and three citizens of Georgia," security service investigator Savle Motiashvili told a briefing.
"The members of the group were planning to sell the nuclear material, uranium-238, for $200 million when they were detained," he told a news briefing.
Motiashvili added that a prefabricated container meant for transporting the Uranium-238 was found at one of the detainee`s apartment.
"Given the gamma ray emission, the identity of the source and radiological expertise report, the seized substance is dangerous for life and health," he said.
A Tbilisi city court sentenced members of the group to pre-trial detention. They face five to 10 years in prison if proved guilty.
Georgia`s security service has stopped several attempts to sell uranium or other radioactive materials. In 2006, a resident of Russia`s North Ossetia region was arrested for trying to sell weapons-grade uranium for $1 million to agents he thought were radical Islamists. He was sentenced to 8 1/2 years in prison.
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