Yes, it was a tiny source, and luckily emits alpha particles which are easy stop by even small amounts of material. > * Unless it gets dispersed somehow. Exac

Yes, it was a tiny source, and luckily emits alpha particles which are easy stop by even small amounts of material. > * Unless it gets dispersed somehow. Exactly, the real worry was that it would get crushed and would be breathed in, in which case it would be a real problem. But even so, the school had to file a report with the nuclear regulator iirc. Lot of paperwork.