Tokyo Electric Power Co. retracted readings for radioactive elements that the utility earlier said it found in water in the basements of buildings at its crippled Fukushima Dai-Ichi nuclear plant, after reviewing the data.
Chlorine-38 and arsenic-74 weren’t detected at the basement of the turbine building of the No. 1 reactor after the company said it found the radioactive materials on March 25, according to a statement on Tokyo Electric’s website.
The reported discovery of the chlorine in the turbine building of reactor No. 1 suggested chain reactions in the core continued after the reactor shut down, physicist Ferenc Dalnoki- Veress of the James Martin Center for Nonproliferation Studies in Monterey, California, wrote in a March 28 paper. Radioactive chlorine has a half-life of 37 minutes, Dalnoki-Veress said.
Tokyo Electric also lowered the readings for the density of other radioactive elements, including cesium-137, technetium-99m and lanthanum-140, found in the water that accumulated in the buildings.
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