Tortoises and turtles accumulate uranium isotopes in their shells, which could provide a reliable record of historical nuclear activity
at the Pacific Northwest National Laboratory in Washington state. Tree rings, for instance, are created sequentially and can carry radionuclides. But the elements can diffuse in the wood between rings, he says, and thus make an unreliable chronological record.
The researchers sampled scutes from four museum specimen turtles, each from a different species in a different location historically exposed to nuclear materials. The shelled subjects included a green sea turtle from the Marshall Islands and a Mojave desert tortoise from Nevada. Both sites experienced nuclear weapons testing in the mid-20th century.A monthly celebration of the biodiversity of our planet’s animals, plants and other organisms.
The team thinks these shambling uranium chronicles could be used to reconstruct histories of the nuclear contamination of ecosystems.at the University of Oviedo in Spain says the study could open a field of radioecology research using zoological collections in museums, where researchers “assess the concentration of radionuclides in feathers, bones and other tissues in specimens collected before and after nuclear tests and accidents”.
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