BOULDER, Colo. (AP) - A laboratory says plutonium that may have spilled into Boulder's sanitary sewer system was below federal and state limits.

The National Institute of Standards and Technology said Tuesday that experts made extensive radiation measurements in the lab where the plutonium was spilled, and the results were analyzed by Energy Department.

A vial containing a small amount of plutonium cracked on June 9. NIST officials say trace amounts may have been washed into sewers when researchers washed their hands after the spill.

Boulder officials say they have found no adverse effects from the potential plutonium release into the city's wastewater system.