You can add this to the list of woes with Allentown's hockey arena site: radioactivity.

State environmental officials say debris containing radioactive material from the arena site was brought to the Bethlehem Landfill in Lower Saucon Township in January.

Officials say the material is radium-226, a naturally-occurring radioactive substance.

There's not a lot of it and officials say it's not dangerous.

Officials are still trying to figure out where it came from.