Spatial distribution of gamma radiation levels in surface soils from Jaduguda uranium mineralization zone, Jharkhand, India, using γ-ray spectrometry, and determination of outdoor dose to the population

Abstract

The concentrations of natural radionuclides in surface soil samples around selected villages of Jaduguda were investigated and compared with the radioactivity level in the region. Concentrations of 238U, 232Th, and 40K were determined by a gamma ray spectrometer using the HPGe detector with 50% relative efficiency, and the radiation dose to the local population was estimated. The average estimated activity concentrations of 238U, 232Th, and 40K in the surface soil were 53.8, 44.2 and 464.2 Bq kg−1 respectively. The average absorbed dose rate in the study area was estimated to be 72.5 nGy h-1, where as the annual effective dose to the population was 0.09 mSv y-1. A correlation analysis was made between measured dose rate and individual radionuclides, in order to delineate the contribution of the respective nuclides towards dose rate. The radio-elemental concentrations of uranium, thorium and potassium estimated for the soils, in the study area, indicated the enrichment of uranium series nuclide. The results of the present study were subsequently compared with international and national recommended values.

Measurement and research of environmental natural radiation dose

“…S.G. Levin et al [3] measured the natural background gamma radiation dose rate in Michigan, Colorado, and Minnesota to determine the relationship between the incidence of congenital disabilities and background radiation. M. Maharana et al [4] determined the concentration of 238 U, 232 Th, 40 K using high-resolution gamma spectrometry. After calibration and fitting, the results of the dose rate and effective dose were obtained.…”

Excess lifetime cancer risk due to natural background radiations of Soil in North Kashmir

“…Research on environmental natural radiations have received universal awareness and lead to widespread study in numerous countries like Spain, Turkey, Nigeria, Malaysia, Iran, and Botswana. The absorbed dose rate in air depends principally on the radionuclide content in the soil, as the largest part of the gamma radiation from the terrestrial and the extra-terrestrial [4,5] radiations.…”