OH & S is a funny thing...
Neglect to wear your hi vis joke vest and you are accused of putting people in danger.
but...
Operating to and overnighting in a city with 11 times the normal level of radiation is okay.
Guys this is a safety issue. In Australia we have government departments to deal with this stuff. Pick up the phone and ask some questions.
Your employer is required to provide you with a safe workplace at all times.