Applicability of Oil Industry Waste Product in Building Industry from Radiological Point of View

抄録

The oil industry currently produces huge amounts of drilling mud, and the re-use of these by products are studied worldwide. In this study, the reusability of deposited drilling mud as a building material was investigated from a radiological point of view. Terrestrial radionuclide concentrations were determined by gamma spectrometry, while the radon exhalations were evaluated by the accumulation method. The caused radiation doses were estimated by different calculation processes in cases in which the by-product was used as a building material. The radionuclide contents were 31 (18-40) Bq/kg of ²²⁶Ra, 35 (33-39) Bq/kg of ²³²Th and 502 (356-673) Bq/kg of ⁴⁰K. The radon exhalation was 12 (6-17) mBq/kgh, and the emanation coefficient of the samples was 6 (5-12) %. According to the applied dose calculation models (indices), all of the results are below the limits; therefore, the use of drilling mud in the building industry exhibits no increased radiological risk. When comparing the applied indices with each other, it must be taken into consideration that the units indicate different dose values. In addition, their calculation is not consistent: excess dose rate vs. total dose Gy vs. Sv. etc.