I have seen one source indicating that specifically on copper, there was a delay of half an hour or so followed by a rapid decline. I have also seen another source indicating that the effectiveness of sunlight in shortening the halflife declines with time. Wish I could find them...
I have seen one source indicating that specifically on copper, there was a delay of half an hour or so followed by a rapid decline. I have also seen another source indicating that the effectiveness of sunlight in shortening the halflife declines with time. Wish I could find them...