Radiation-measuring flights set for Marathon route

BOSTON – A helicopter equipped with radiation-sensing technology will make several low passes over the 26.2-mile Boston Marathon route later this week to measure naturally occurring background radiation ahead of the 120th annual race next week.
Between Tuesday and Friday, the National Nuclear Security Administration will use the chopper to measure background levels along the route and slightly beyond, flying a twin-engine Bell 412 helicopter in a grid pattern at about 150 feet above the ground at speeds of about 80 miles an hour, the agency said.