It's going to take a bit longer than 10 secobds to safely get close enough to such a strong radiation source as to take a clear picture or read a number.
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.
And since they knew they were looking for radioactive material, I would hazard a guess that they already have necessary protection.