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Physics > Medical Physics

arXiv:physics/0212099 (physics)
[Submitted on 26 Dec 2002]

Title:Gamma-ray measurements of naturally occurring radioactive samples from Cyprus characteristic geological rocks

Authors:M. Tzortzis, H. Tsertos (Dept. of Physics, Univ. of Cyprus), S. Christofides, G. Christodoulides (Medical Phys. Dept., Nicosia General Hosptital)
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Abstract: Using high-resolution gamma-ray spectroscopy, the terrestrial gamma radiation in all the predominant types of geological rock formations appearing in Cyprus was measured. Soil samples were collected from each rock type, sealed in 1-litre plastic Marinelli beakers, and measured in the laboratory for 24 hours each. From the measured gamma-ray spectra, activity concentrations were determined for Th-232 (range from 1.3 to 52.8 Bq/kg), U-238 (from 0.9 to 90.3 Bq/kg) and K-40 (from 13 to 894 Bq/kg). Elemental concentrations mean values of (2.8 +- 0.7) ppm, (1.3 +- 0.3) ppm and (0.6 +- 0.1) % were extracted, for thorium, uranium and potassium, respectively. Absorbed dose rates in air outdoors were calculated to be in the range of 0.1-50 nGy/h, depending on the geological features, with an overall mean value of (14.7 +- 7.3) nGy/h. The corresponding effective dose rates per person outdoors were estimated to be between 0.1 and 61.4 microSv/y, assuming a 20% occupancy factor.
Comments: 27 pages including 3 tables and 4 figures; To appear in Radiation Measurements
Subjects: Medical Physics (physics.med-ph); Nuclear Experiment (nucl-ex); Physics and Society (physics.soc-ph)
Report number: University of Cyprus preprint UCY-PHY-02/02
Cite as: arXiv:physics/0212099 [physics.med-ph]
  (or arXiv:physics/0212099v1 [physics.med-ph] for this version)
  https://doi.org/10.48550/arXiv.physics/0212099
Journal reference: Radiat.Meas. 37 (2003) 221-229

Submission history

From: Haralabos Tsertos [view email]
[v1] Thu, 26 Dec 2002 12:25:26 UTC (197 KB)
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