Journal
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
Volume 56, Issue 2, Pages 823-834Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TGRS.2017.2755466
Keywords
Airborne gamma-ray spectroscopy (AGRS); atmospheric radon; cosmic effective dose; cosmic radiation; lower atmosphere
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Funding
- National Institute of Nuclear Physics (INFN) through the ITALian RADioactivity project (ITALRAD)
- Theoretical Astroparticle Physics (TAsP) research network
- Geological and Seismic Survey of the Umbria Region (UMBRIARAD)
- University of Ferrara Fondo di Ateneo per la Ricerca scientifica (FAR)
- Project Agroalimentare Idrointelligente [CUP D92I16000030009]
- MIUR (Ministero dell'fIstruzione, dell'fUniversita e della Ricerca) under Project MIUR-PRIN
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In this paper, we present the results of an similar to 5-h airborne gamma-ray survey carried out over the Tyrrhenian Sea in which the height range (77-3066) m has been investigated. Gamma-ray spectroscopy measurements have been performed using the AGRS_16L detector, a module of four 4L NaI(Tl) crystals. The experimental setup was mounted on the Radgyro, a prototype aircraft designed for multisensorial acquisitions in the field of proximal remote sensing. By acquiring high-statistics spectra over the sea (i.e., in the absence of signals having geological origin) and by spanning a wide spectrum of altitudes, it has been possible to split the measured count rate into a constant aircraft component and a cosmic component exponentially increasing with increasing height. The monitoring of the count rate having pure cosmic origin in the > 3-MeV energy region allowed to infer the background count rates in the K-40, Bi-214, and Tl-208 photopeaks, which need to be subtracted in processing airborne gamma-ray data in order to estimate the potassium, uranium, and thorium abundances in the ground. Moreover, a calibration procedure has been carried out by implementing the CARI-6P and Excel-based program for calculating atmospheric cosmic ray spectrum dosimetry tools, according to which the annual cosmic effective dose to human population has been linearly related to the measured cosmic count rates.
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