Natural radioactivity and its gamma dose rate in Mission (Texas) soils
The activity concentration of radionuclides in 238U, 232Th, and 40K were determined in Mission (Texas) surface soils through gamma-ray spectrometry measurements using hyper pure germanium detector. Activity concentrations of 238U, 232Th, and 40K were 13–32 Bq kg−1 (mean value: 23 Bq kg−1), 17–47 Bq kg−1 (mean value: 31 Bq kg−1), and 100–460 Bq kg−1 (mean value: 300 Bq kg−1) respectively. The absorbed gamma dose rate in air from these soils were found in the range of 23 to 56 nGy h−1 with an average value of 42 nGy h−1. The contribution to the absorbed gamma dose rate in air was observed as 26 % from 238U, 45 % from 232Th, and 29 % from 40K. The outdoor annual effective dose equivalent varied between 28 and 69 μSv y−1 with the mean value of 52 μSv y−1.The evaluated data were compared with the data from different countries and also with the world mean value.
Hannan, M.A., Nguyen, N. & Rivas, M. Natural radioactivity and its gamma dose rate in Mission (Texas) soils. J Radioanal Nucl Chem 295, 729–736 (2013). https://doi.org/10.1007/s10967-012-1840-9
Journal of Radioanalytical and Nuclear Chemistry