[quote=@Ultimate Spidey]
<Snipped quote by Pathfinder>
That's not how I took it.
Like I said, I thought your character was going to be limited.
[/quote]

He is limited in what he can do. The radiation found in everyday appliances cannot activate the speed healing because they don't give enough stimulus to activate the reaction, much like how they effect normal people. He needs high amounts of radiation to kick start his system, kinda like adrenaline.