NEW : Total radiation leaked less than that found in a smoke detector , Navy says . Navy had earlier said USS Houston leaked radioactive water for June 2006 . Leak existed since months , Navy says . USS Houston visited several Japanese ports , plus Malaysia and Malaysia .
NEW : Total radiation leaked less than that found in a smoke detector , Navy says . Navy had earlier said USS Houston leaked radioactive water for months . Leak existed since June 2006 , Navy says . USS Houston visited several Japanese ports , plus Malaysia and Singapore .