TEST DEPLOYMENT AT A SUBMARINE GROUNDWATER DISCHARGE (LAVRIO, ATTICA, GREECE)
On 26th of October 2016, the RadioMariners’ group of HCMR in collaboration with five colleagues from Shandong Academy of Science in China and with Dr. Anna Gyldenfeldt from the Federal Maritime and Hydrographic Agency (BSH) in Germany organized and implement test deployments of two marine in-situ sensors for radioactivity measurements on a submarine groundwater discharge. The systems were connected with a new underwater battery pack with maximum depth of deployment 200m.
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The KATERINA II system is calibrated accurately in a laboratory tank and has provided successfully in-situ quantitative results of marine radioactivity in many areas worldwide (Mediterranean Sea, Black Sea, Caspian Sea, Baltic Sea, Red Sea, Atlantic Ocean, Pacific Ocean). Although it is a low resolution system the results were reliable and applying different validation processes and frames of collaboration (including IAEA), the detection system proved its high performance when operated in the ocean.
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The GeoMAREA marine sensor is developed in 2015 and intercomparison exercises are needed for improving the quantification method. So, GeoMAREA detection system was deployed very close to KATERINA II system in order to monitor radon daughters at the same marine environment. The two in-situ systems exhibited excellent agreement according to laboratory calibration constants for the two gamma-ray emitters of radon: at 609 keV of 214Bi and at 351keV of 214Pb.
