The Environment Centre in the Northern Territory is urging the Federal Government to stop uranium exports to all countries with nuclear weapons.

The Environment Centre's Justin Tutty told a parliamentary hearing in Darwin today there is no concrete guarantees that uranium sold for energy will not be used for nuclear weapons.

Mr Tutty says the committee needs to recognise Australia's uranium exports do have an impact on nuclear proliferation.

"The Government's own defence white paper, which was released just a few days ago, clearly states that they expect that in the near future there'll be more nuclear weapon states and that proliferation of nuclear weapons will remain an issue," he said.

"The defence white paper acknowledges that our uranium exports are a driver for this growing nuclear risk."