The radiation levels in the two hospitalised men were at or above 4 becquerels per square centimetre, the threshold which is considered safe.
Honestly. This is journalistic malpractice.
A Becquerel (should be capitalized) is 1 decay per second. That isn’t really even detectable above background, and radiation is really, really easy to detect in minute quantities.
I have spilled vastly more than that on myself and didn’t even bother telling anyone.
A simple nuclear medicine scan uses something like 500 MBq.
This is at the level of rubbing yourself with a banana.