As others have noted, those exposed are safe and the exposure was fairly minimal. But, these precautions are always important, both to monitor the direct effects on those involved and to allow for proper decontamination and limit any possibility of further spread of radioactive material.
By quantifying, monitoring and containing you can maintain safety around the whole incident. If you don't, there's the chance you're left trying to investigate, trace and mitigate after the fact, similar to accidents in 1987 Goiânia, Goiás, Brazil or 1984 Cuidad, Juarez, Mexico. You really don't want that.