Pregled bibliografske jedinice broj: 230592
Some Problems of the Radiometric Mapping of Carbonate Terrains - An Example From Istria (Croatia)
Some Problems of the Radiometric Mapping of Carbonate Terrains - An Example From Istria (Croatia) // Geologia Croatica : journal of the Croatian Geological Survey and the Croatian Geological Society, 47 (1994), 1; 73-82 (međunarodna recenzija, članak, znanstveni)
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Naslov
Some Problems of the Radiometric Mapping of Carbonate Terrains - An Example From Istria (Croatia)
Autori
Barišić, Delko ; Prohić, Esad ; Lulić, Stipe
Izvornik
Geologia Croatica : journal of the Croatian Geological Survey and the Croatian Geological Society (1330-030X) 47
(1994), 1;
73-82
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
radiometric mapping ; carbonate terrains ; soil ; bedrock ; gamma-spectrometry ; conversion factors ; gamma dose rate ; Istria ; Croatia
Sažetak
The gamma dose rate were calculated from the results of gamma-spectrometric measurements of radionuclide concentrations in soils in the region of the Istria peninsula, Croatia. Calculated gama dose rate conversion factors (GDRCF) for external exposure above ground, give external dose rates per unit of natural radionuclide concentration in the soil and bedrock. GDRCF in air at a high of 100 cm above ground are tabulated for 40-K, 232-Th decay series, 238-U - 230-Th subseries and 226-Ra - 210-Pb subseries for various source depths in soil or bedrock up to a maximum depth of 120 cm. The radiometric maps must take into consideration gamma doses from soils as well as from underlying rocks in the first metre of ground profile. This is of crucial importance especially for carbonate terrains, where the differences between natural radionuclide concentrations in carbonate derived soils and carbonate bedrock could be of two orders of magnitude. Furthemore, for soils themselves the role of the drainage network in migration processes is undoubtedly very important. All these dependencies make us belive that gamma-spectrometric measurements and related dose rate conversions in connection with in situ dose measurements could be the best method for radiometric mapping at least for carbonate terrains with numerous rock outcrops, poor drainage and lithological variability on a local scale. Recalculation of natural background dose rate data, collected by airborne or carborne surveys, into radionuclide concentration in the ground in carbonate terrains is possible in two cases only: whwn soil is completely absent or whwre soils are well developed (thicknesses of 25 cm or more)
Izvorni jezik
Engleski
Znanstvena područja
Kemija
