A sealed source can be identified by using radiation detection instruments. Most, but not all, are labelled with a trefoil.
“We’ll put up a sign that has the trefoil, which has the radioactive symbol most people are commonly used to seeing, because at that point we’ll start excavating and we’ll expose that ...
The new symbol is aimed at alerting anyone, anywhere, to the potential dangers of being close to a large source of ionizing radiation and will supplement the decades-old three-cornered trefoil ...
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