I've suggested something similiar
here.
I think this would work much better as a zone brick, just quietly ;)
Also, the radiation effects could perhaps be toggleable? Add an extra box where you write in a number followed by a comma, and that number indicates the different effects so you can have level of radiation.
So, say, if I want to have an area that's a light level of radiation where the player doesn't take damage and just lightly spins, they go deeper and start getting blurry, they go deeper and start taking damage, then they go even deeper and start vomiting before dying.
Cool idea, nonetheless- thought I'd throw my two cents in ;D