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|Authors: ||L.Sartini; Istituto Nazionale di Geofisica e Vulcanologia, *|
|Title: ||GEMS: Underwater spectrometer for long-term radioactivity measurements|
|Issue Date: ||4-May-2010|
|Keywords: ||NaI(Tl), underwater spectrometer|
|Abstract: ||GEMS (Gamma Energy Marine Spectrometer) is a prototype of an autonomous radioactivity sensor for underwater
measurements, developed in the framework of the KM3NeT Design Study (DS) EC project. The spectrometer is
sensitive to gamma rays produced by 40K decays and it is also able to detect other natural (e.g., 238U, 232Th) and
anthropogenic radionuclides (e.g. 137Cs). The decay of 40K, contained in sea salt, particulate and sediments, is one
of the main sources of photon background in the underwater environment.
GEMS was first calibrated in the laboratory using known sources, also in order to evaluate the performance of
the instrument. In November 2008 GEMS was deployed at a depth of 3200 m in the area of Capo Passero (in the
Ionian Sea) to acquire data autonomously. After recovery of the spectrometer six months later (May 2009) it was
found that the instrument had worked within the specifications and acquired data over the full deployment period.
These data allowed us to investigate over a long period the possible variations of activity at the Capo Passero site.
GEMS is suitable to be used either in autonomous mode or as payload of seafloor observatories or vehicles.|
|Appears in Collections:||03.03.99. General or miscellaneous|
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