That looks like something I'd buy-- great job!
How would it look if a pair of handcuffs could be added atop the radiation symbol? Would that be too crowded? Or would it be possible to put the words "AIT Free" atop the symbol somehow?
If the above ideas don't work, that's fine too as I think it looks really good as-is.
What would the cost be to produce these? I guess that's the next factor to consider.