I didn't ask you a vague question.
Yes you did. How long is considered long term exposure? Non specific
Who is being exposed a child, an average man?
How are they being exposed? Naked and no clothes or clothed. Continuous exposure or are there rest periods?
Lastly where on earth are they being exposed equator, North pole or are they up in space?
Give some information otherwise it is a very vague non specific question that doesn't even warrant a response.