Cat litter, granite and truckloads of porcelain toilets headed for Home Depot and Lowes are setting off radiation alarms. And they're not remotely as "hot" as the humans.
With the explosion of nuclear medicine, physicians are giving radioactive drugs to people an estimated 20 million times a year. For a few days to several weeks those people are emitting gamma rays, beta particles or X-rays that can radiate beyond the walls of cars, buses and subway trains to reach the attention of anti-terror authorities.
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