China's Sichuan province--radiation issue?

Reuters:

Sichuan province...

"China has found what it termed 50 "hazardous sources of radiation" due to last week's earthquake...." And "The disaster area is home to China's chief nuclear weapons research lab in Mianyang, as well as several secretive atomic sites, but no nuclear power stations."

Wu Xiaoqing [vice environment minister] said "Thirty-five of the radiation sources have been recovered, and the location of another 15 has been confirmed, but they have not yet been recovered".

I wonder how serious this is?