So, according to the nyhistory article, it was known at least by the 1930s that ...

		bagels on Feb 26, 2023 \| parent \| context \| favorite \| on: The most radioactive spot in New York City can als... So, according to the nyhistory article, it was known at least by the 1930s that it was pretty harmful, but the dumping continued in to the 40s.