Naslov
Radiological characterization of fly and bottom ash landfill of the former sulfate pulp factory Plaški

Autori
Oreščanin, Višnja ; Kollar, Robert ; Buben, Krešimir ; Lovrenčić Mikelić, Ivanka ; Kollar, Karlo ; Kollar, Melkior ; Medunuić, Gordana

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
THE FIRST INTERNATIONAL CONFERENCE ON RADIATION AND DOSIMETRY IN VARIOUS FIELDS OF RESEARCH RAD2012 / Ristić, Goran - Niš : Elektronski fakultet Univerziteta u Nišu, 2012, 267-269

ISBN
978-86-6125-063-7

Skup
The First International Conference on Radiation and Dosimetry

Mjesto i datum
Niš, Srbija, 25.04.2012. - 27.04.2012

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
fly and bottom ash landfill; Plaski; total effective dose rate; radionuclides

Sažetak
The purpose of this research was determination of the radiological profile of the fly and bottom ash, by-product of coal burning in the thermoelectric unit of the former “Simo Dimic“ sulfate pulp factory. The characterization was done in order to classify the waste material, assess its impact to the environment and exposed population and recommend appropriate management solution. The research involves determination of the activities of the radionuclides using a HPGe GR1520 semiconductor detector coupled with a multichannel analyzer LYNX and in situ measurement of an effective dose rate above the landfill using RadEye PRD-ER device. The mean value of the total effective dose rate measured in the air at the height of 1 m for all samples of ash was 1.60 mSv/yr which is two times higher compared to Croatian average (0.7015 mSv/yr), and 11.4 times higher compared to the local background (0.14 mSv/yr). In the samples of ash regardless of the sampling position the activity concentrations of the radionuclides in Bq/kg vary in the following ranges: Ra-226 from 82.10 to 314.90 (mean value 144.3), Th-232 from 32.50 to 223.60 (mean value 72.7) and U-238 from 69.10 to 243.20 (mean value 129.6). Compared to the mean values found in the background soil Ra-226 and U-238 mean activity concentrations increased 6.4 times and Th-232 4.3 times. In order to reduce total effective dose rate to the local “background“ values and to prevent redistribution of the radionuclides from the deposited material into the environment fly and bottom ash landfill must be sealed with 10 cm thick layer of the material with low permeability.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Kemija

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