Snippets from article:

“three buckets full of uranium ore sat in a museum building”

“children on tours sitting next to the buckets for a half-hour.”

Some good news: “Simply being near uranium ore is unlikely to result in an unsafe dose of radiation”

“technicians reportedly dumped the buckets at an old uranium mine 2 miles away, then for some reason brought the buckets back to the building.”

“specially concerned about kids who were potentially exposed to radiation, at levels he calculated to be 1,400 times the Nuclear Regulatory Commission’s safe level for children.”

This is the article: https://www.npr.org/2019/02/19/696001017/grand-canyon-museum-reportedly-had-buckets-of-uranium-sitting-around-for-18-year

Information about radiation: https://www.azcentral.com/story/news/local/arizona/2019/02/18/grand-canyon-uranium-case-6-things-know-radiation-exposure/2907787002/