What is the Contamination Risk, and what is it Dependent on?

-This is how Likely an Object is to get Contaminated -This can be dependent on the State of the Source. If its a Solid, then it needs Physical Touch, or just Very Near Contact for a Contamination Risk to be Present -If its a Gas, then that means the Radioactive Source can Move Around, and even be Inhaled meaning your Insides will be even more Affected