 A fizzle can also result from the use of reactor grade plutonium rather than weapons-grade material.On October 13, 2006, CNN reported that two U.S. government officials with access to classified information stated that the initial air sampling over North Korea shows no indication of radioactive debris from the event that North Korea says was an underground nuclear test.Some hours later, the report was reversed and stated there was evidence of radiation, though not enough data has been collected yet to be conclusive.