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Radon and remediation measures near Băiţa-Ştei old uranium mine (Romania)

Cosma C., Cucoş A., Papp B., Begy R., Dicu T., Moldovan M., Truţă L., Niţă D., Burghele B., Suciu L., Sainz C.

Acta Geophysica

2013

Vol. 61, no. 4

859--875

Băiţa-Ştei mine is an open pit mine in NW Romania (West Carpathian Mountains). It was the largest surface uranium deposit in the world. Two means of uranium transport and dissemination were used over time. The first was the natural way, represented by transportation of geological sediments by Crişul-Băiţa River that crosses the Băiţa surface deposit. These sediments were used as building materials (stone, gravel, sand). The second way was related to the people living in this valley, who used also the uranium waste as building material. The preliminary indoor radon concentrations measured in the buildings ranged from 40 to 4000 Bq m−3 with a mean value of 241 Bq m−3. A focused radon survey facilitated the selection of 20 houses with the highest indoor radon that were therefore proposed for remediation. To find the radon sources of these houses, systematic investigations on radon were performed. The remedial measures for these 20 houses were tested on a chosen pilot house.

Genotoxic effects of 60Co gamma-rays on Chinese hamster ovary (CHO) cells

Dicu T., Brie I., Virag P., Fischer E., Perde M., Foriş V., Cernea V., Cosma C.

Nukleonika

2008

Vol. 53, No. 4

161-165

The aim of the present study was to evaluate the cellular radiosensitivity and radiation-induced DNA damage and repair in Chinese hamster ovary (CHO) cells. Cell survival after irradiation was assessed using the clonogenic assay. The initial, radio-induced and residual DNA damage in Chinese hamster ovary (CHO) cells exposed to 60Co gamma-rays were determined using the alkaline comet assay. A linear-quadratic (LQ) survival curve was observed in CHO line. Data obtained by comet assay demonstrated a linear dose-response correlation in the range of tested doses (0.3-4 Gy). The process of DNA repair was modeled by exponential equation. In addition, we found a good correlation (R2 = 0.995) between clonogenic cell survival and radio-induced DNA damage.