NNSA conducts aerial radiation surveys over San Francisco ahead of Super Bowl(energy.gov)
energy.gov
NNSA conducts aerial radiation surveys over San Francisco ahead of Super Bowl
https://www.energy.gov/nnsa/articles/nnsa-conduct-aerial-radiation-assessment-surveys-over-san-francisco-bay-area-ahead-0
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See also: https://www.flightradar24.com/ENRGY14/3e2a0731