Los Angeles County public health officials said Tuesday there was no evidence of discernible radiation around the Santa Susana Field Laboratory, part of which burned at the onset of the Woolsey Fire.

Residents raised concerns about the danger of radioactive dust after fire burned through the former Rocketdyne site at the Santa Susana field, located near the flashpoint of the Woolsey blaze.

Supervisor Kathryn Barger asked county health officials to test the facility, a former rocket-fuel development and industrial research site located in Ventura County and regulated by the California Department of Toxic Substances Control.

Barger said county employees performed nuclide identification, collected air samples and operated multiple radiation detection units.

Public health shared its findings with the DTSC and partner agencies, including the California National Guard’s 9th Civil Support Team and the Department of Energy Radiological Assistance Program, which took measurements of their own.

“All found no evidence of discernible radiation in areas they tested around the facility,” according to a statement issued by the Department of Public Health.

Authorities said they will continue to monitor the facility.

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