Data is scare on radiation coming from Japan 's nuclear reactors . Experts need good practice in building computer models to track radioactivity . Official : ` ` There 's a lot of genuine confusion about what is going on '' U.S. government experts trying to construct a model of radiation plumes emanating from Japan 's Fukushima Daiichi power plant are being hampered by a `` paucity of good data , '' a senior administration official told CNN . Experts say radiation from Japan does not pose a significant health risk to the U.S .
Data is scare on radiation coming from Japan 's nuclear reactors . Experts need good practice in building computer models to track radioactivity . Official : ` ` There 's a lot of genuine confusion about what is going on '' Experts say radiation from Japan does not pose a significant health risk to the U.S .