March 13th, 2011 – 2200 EDT – USNRC Emergency Operations Center Status Update, Enformable, Dec. 12, 2011:
Morning of March 13, 2011
USS Reagan ~130 miles (240 km) off Japan coast
Dose rates from overhead plume were .6 mrem/hour (6 microsieverts/hour)
Navy sent samples to base fro isotopic analysis
(Italicized by NRC) “Principle radionuclides identified were iodine, cesium, and technetium, consistent with a release from a nuclear reactor.“
h/t Anonymous tip
SOURCE: Enformable jpg image of NRC document is at http://enformable.com/wp-content/uploads/2011/12/Enformable-ML11229A190_Page_031.jpg
One of the only mentions by US media of technetium being found INSIDE the Fukushima plant is Tepco Retracts Chlorine, Arsenic Findings at Fukushima Station, Bloomberg, Apr 20, 2011:
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.
end quote (forwarded by Whoopie. Thanks.)
Technetium 99m has a half life of 6 hours. It decays to Technetium 99 which has a half life of 211000 years.
The report does not mention the which isotope of Technetium was detected.