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Abstract
Fractionated drilling wastes originating from shale gas exploration in the Baltic Basin in Pomerania were subjected to the measurements of mean activity concentrations of naturally occurring radioactive materials (NORMs).To better understand rock structure and texture, the X-ray diffraction analysis (XRD) and scanning electron microscopy(SEM) observation were used. To compare activity concentration of radionuclides in bulk wastes and fractionated samples (the latter were obtained through a sieve analysis), they were analyzed by gamma-ray spectrometer, both before and after the Dean-Stark extraction. After fractionation, three different size ranges were distinguished. Radiological indices were estimated by comparison with the levels recommended by International Association of Oil and Gas Producers (OGP) and the equivalent absorbed dose was determined with respect to appropriated disposal of cuttings. The results show that the drilling cuttings from the Ordovician period have a natural radioactivity level comparable to other rocks with the same lithology (potassium K-40 800-992 Bq/kg and thorium Th-232 23.3-30.8 Bq/kg) and they do not exceed acceptable levels of total absorbed dose rate. The average global value is 55 nGy/h and the average absorbed dose rate in outdoor air 1 m above the drilling cuttings was 54.1nGy/h. The relation between particle size and natural radioactivity indicates that concentration of radionuclides increases as the fractions size decreases.
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- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.5277/ppmp150213
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- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
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Physicochemical Problems of Mineral Processing
no. 51,
pages 521 - 533,
ISSN: 1643-1049 - Language:
- English
- Publication year:
- 2015
- Bibliographic description:
- Mykowska A., Rogala A., Kallas A., Karczewski J., Hupka J.: Radioactivity of drilling cuttings from shale resources of the Lower Paleozoic Baltic Basin, Poland// Physicochemical Problems of Mineral Processing. -Vol. 51, nr. 2 (2015), s.521-533
- DOI:
- Digital Object Identifier (open in new tab) 10.5277/ppmp150213
- Verified by:
- Gdańsk University of Technology
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