Abstract
An optimized device based on an HPGe detector and an electro-mechanical cooler combined with a small-sized lead shield was developed for flow-through seawater gamma radionuclide measurement. The system was optimized to operate in mobile or underway mode with suitable integration on available ships. The background spectrum, detection efficiency, and the impact of acquisition time on the minimum detectable activity were obtained at sea. The system MDAs in a 1 h acquisition period for 137Cs (661.7 KeV) and 60Co (1332.5 KeV) in seawater were 0.45 Bq/L and 0.24 Bq/L, and the MDAs in 20 min were 0.73 Bq/L and 0.47Bq/L, respectively. This device could be used as an efficient tool in emergency monitoring in response to a nuclear accident.
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