We don’t often get advance warning of helicopters that might give you cause for concern, but here’s one: The state is doing a survey of urban radiation levels, with a chopper that will be based out of Boeing Field over the next couple weeks. No, they say, it has nothing to do with the quake/tsunami-related nuclear trouble in Japan – they’re taking baseline readings of “normal” levels as part of a project that started two years ago. Seattle-based Local Health Guide explains the plan here; the state’s own webpage, with even more details, is here. Flights are scheduled to start next Monday, and so far we do not have a schedule of when, or even if, you might see the chopper here.