Assessment�of�natural�radioactivity�level�in�rocks�of�ditrau�alkaline�massif�area�,�eastern�carpathians,�romania

Ion, Adriana

doi:10.5593/sgem2012/s20.v5013

Cited by 1 publication

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“…The soil samples were analyzed non-destructively using a gamma-ray spectrometry methodology with a high-purity germanium (HPGe) detector connected to digital multichannel analyzer (MCA) with 16,684 channels (ORTEC) [24,25]. The relative efficiency of the HPGe detector was 26%, and the energy resolution for 60 Co was 1.80 keV and was 0.800 keV for 57 Co. A cylindrical lead shield with a wall thickness of 10 cm protected the detector from background radiation.…”

Section: Analytical Techniquesmentioning

confidence: 99%

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Natural Radioactivity in Soil and Radiological Risk Assessment in Lișava Uranium Mining Sector, Banat Mountains, Romania

Ion

Cosac²,

Ene³

2022

Applied Sciences

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The specific activity and spatial distribution of 238U, 232Th and 40K were determined in the surface soil from the Lișava uranium mining sector. This sector belongs to the Banat district, an historically important uranium mining area in Romania (an area with closed uranium mines and a radioactive waste dump). Gamma-ray spectrometry using a high-purity germanium (HPGe) detector was used to measure the activity of naturally occurring radionuclides in the soil. The average specific activities of 238U, 232Th and 40K in the soil were 197.21 Bq/kg for 238U, 16.21 Bq/kg for 232Th and 543.21 Bq/kg for 40K. The mineral contents of selected waste rock samples (sandstones) were examined using a scanning electron microscope (SEM), which revealed that brannerite, pitchblende and coffinite were the most important uranium-bearing minerals. The means of the radiological hazard parameters were calculated to be 262.22 Bq/kg radium equivalent activity (Raeq), 123.72 nGy/h absorbed gamma dose rates (DR), 0.7 external hazard index (Hex) and 1.8 representative level index (RLI). The spatial distribution of the risk assessment indices associated with the investigated soils exceeded the median values provided by UNSCEAR and reflected the geological settings and influences of anthropic activities such as uranium mining practices and the tipping of radioactive mining waste.

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Section: Analytical Techniquesmentioning

confidence: 99%

“…The γ-lines of 338.4 and 911.2 keV for 228 Ac, 727 keV for 212 Bi and 860 keV for 208 Tl were used to calculate the activity for 232 Th. 40 K activity was calculated based on its emission at 1460 keV [24,25].…”

Section: Analytical Techniquesmentioning

confidence: 99%