It's not that strong of a source. You wouldn't want to go about your day with it in your pocket, but last I read a 1m exposure for an hour was a few x-rays wort

It's not that strong of a source. You wouldn't want to go about your day with it in your pocket, but last I read a 1m exposure for an hour was a few x-rays worth of radiation. Take out your phone and zoom in. And since they knew they were looking for radioactive material, I would hazard a guess that they already have necessary protection.