The culprit: improperly stored radiation containers.
from gizmodo http://www.gizmodo.co.uk/2019/02/grand-canyon-museumgoers-exposed-to-uranium-for-years-safety-manager-claims/
from gizmodo http://www.gizmodo.co.uk/2019/02/grand-canyon-museumgoers-exposed-to-uranium-for-years-safety-manager-claims/
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