title: An autonomous in situ detection system for radioactivity measurements in the marine environment.
abstract: A new detection system named "KATERINA" is developed and applied for measuring marine radioactivity using NaI(Tl) as a crystal. This apparatus is designed for qualitative and quantitative radionuclide detection in the marine environment with maximum depth of deployment 400 m. A detailed study for the enclosure of the system and for the electronics development is performed. The system offers volumetric activities in Bq/m(3) using the marine efficiency calibration, which is measured by dilution of three reference sources ((99m)Tc, (137)Cs, and (40)K) in a special tank. The calibration procedures for energy, energy resolution and efficiency were analyzed with particular attention to the factors that affect the calibration parameters. The underwater detector is tested in the field for acquiring radon daughters ((214)Pb and (214)Bi) in a region where submarine groundwater discharge exists in the coastal zone.
authors: Hellenic Centre for Marine Research, Institute of Oceanography, P.O. Box 712, GR-19013 Anavyssos, Greece. tsabaris@ath.hcmr.gr
authors: C
authors: C
authors: Tsabaris
authors: C
authors: C
authors: Bagatelas
authors: Th
authors: T
authors: Dakladas
authors: C T
authors: CT
authors: Papadopoulos
authors: R
authors: R
authors: Vlastou
authors: G T
authors: GT
authors: Chronis
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D008386:Marine Biology / Q000295:instrumentation*; D009792:Oceans and Seas; D011829:Radiation Dosage; D011834:Radiation Monitoring / Q000295:instrumentation*; D011868:Radioisotopes / Q000032:analysis*; D012371:Robotics / Q000295:instrumentation; D012588:Scintillation Counting / Q000295:instrumentation*; D013057:Spectrum Analysis / Q000295:instrumentation*; D014867:Water / Q000737:chemistry*; D014875:Water Pollutants, Radioactive / Q000032:analysis*
chemical_list: D011868:Radioisotopes; D014875:Water Pollutants, Radioactive; D014867:Water