An unidentified lab researcher accidentally spilled phosphorus-32, a radioactive isotope, at a Schlundt Annex laboratory. The researcher then walked outside, unaware that the chemical spilled onto his or her shoes. Without traveling too far, the researcher realized something was wrong.

"(The worker) called the Environmental Health and Safety Department," MU spokesman Christian Basi said. "They responded right away and were there for several hours."

Department workers are using Geiger counters to locate radiation patches. Most of the radiation is in a dirt filled area, at a corner outside Schlundt Annex, the biochemistry building. The radioactive dirt will then be stored for up to six months before it can be disposed. Most of the researcher's footprints have been sealed with black paint to stop any possible contamination from spreading.

"We know for sure that there are no personal health risks to anyone in the area," Basi said.

The risk of airborne exposure to phosphorus-32 is minimal, but it is very dangerous if ingested.

The MU Environmental Health and Safety Department and biochemistry students and teachers declined interviews. After the cleanup, an investigation will determine if disciplinary action is necessary.

"I don't see for there to be any reason for an investigation," MU student Jonathan Willbrand saod. "It's not going to hurt anybody, and it's being cleaned up."

No classes were canceled, but six laboratories now have restricted access.