i am assuming that the below 1,2,3.... points are in gallery. if you are trying to refer gallery radiobox outside it won't work.
i am assuming you want something like if none of the items in gallery is notok than proceed to NAOOK screen else other screen
use If( IsBlank( LookUp(urgallery.AllItems,Radio2.Selected.Value="NOT OK")),Navigate(APA ),Navigate(NAOOK))
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