Iran's president said Sunday that his nation's pursuit of nuclear technology was irreversible, taking a tough tone ahead of a UN deadline this week demanding his country suspend part of its nuclear program. "The great decision of the iranian nation for progress and acquiring technology is a definite decision. There is no way back from this path," Ahmadinejad said in a speech on national television after giving awards to 14 nuclear officials and scientists. Ahmadinejad said it was the United States who should give up nuclear technology because it could not be trusted with it, since it developed and used nuclear weapons. "Our nation does not accept the claim that science and technology is good for some and bad for others because of the possibility of the diversion (to nuclear weapons)," he said.