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A “sentinel”-type device, equipped with a NaI (Tl)-based underwater gamma-spectrometer mounted on a stationary buoy, transmitting data through satellite connection, was deployed in the north-western Irish Sea.The data recorded and received in real-time indicated that no detectable significant changes occurred in the concentrations of 137Cs at the mooring site in the period September to November, 2000. Other anthropogenic gamma-emitters were not detected.

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