Radiation levels across the Marshall Islands in the central Pacific Ocean, where the United States conducted more than 65 nuclear tests during the Cold War, are still alarmingly high — even higher than Fukushima and Chernobyl in some parts, a new study shows.
Researchers at Columbia University tested soil samples on four uninhabited isles and discovered that they contained concentrations of nuclear isotopes that are “significantly” higher than those found near the two disaster sites.
“All of these measurements are important due to the potential for repopulation of at least some of the atolls in the Marshall Islands,” explained Dr. David Krofcheck, of the physics department at the University of Auckland.
“Such measurements of the effects of nuclear weapons testing in the Marshall Islands must continue on a regular basis into the indefinite future,” he told the Science Media Centre.
Two of the isles where the soil was analyzed — Bikini and Enewetak — were used as “ground-zero” for US nuclear tests between 1946 and 1958. The others, Rongelap and Utirik, were affected by radioactive fallout from the largest of the 67 tests conducted, known as the Bravo test.
Researchers at Columbia said they aimed to “present a picture of current radiological conditions” in the region “by examining external gamma radiation and soil radionuclide activity concentrations.”
Their findings, which were published Monday in the journal PNAS, showed that gamma radiation in some areas were “well above” the legal exposure limit established in agreements between the US and Republic of the Marshall Islands.
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