Was the Arc of The Covenant radioactive?

In the Old Testament you read about it's effects on the ancients how some of them died from mishandling it. The Amorites suffered boils and cancer from the Ark of the Covenant. King David's friend Uzziah died after he mishandled it. In II Samuel 6/6-7. If this ark was not radioactive or possed not type of electricity then why did so many people die from carrying what you would beleive to be a un electronic ark.