Radioactive particles from the Fukushima disaster have been detected in – of all places – California wines.

Inspired by tests conducted in the aftermath of the 1986 Chernobyl disaster, researchers at France’s National Center for Scientific Research, or CNRS, decided to test a series of California wines dating between 2009 and 2012. They looked for traces of radioactive particles, specifically cesium-137, a man-made isotope.

Smithsonian.com reported on the team’s findings:

Their findings, newly published in the pre-print online journal Arxiv, suggest that currents and atmospheric patterns carried radioactive particles across the Pacific, where they settled on grapevines growing in California’s wine regions. The team writes that bottles produced following the nuclear meltdown contain increased levels of cesium-137, with the cabernet revealing double the amount of pre-Fukushima radiation.