Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2009, Vol. 20 ›› Issue (6): 335-339 doi: 10.13538/j.1001-8042/nst.20.335-339

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Natural radioactive environment of urban soils in Shihezi, China

GE Benwei1 LIU Anna2,*   

  1. 1 College of Tourism and Environment, Shaanxi Normal University, Xi’an, Shaanxi 710062, China 2 Department of Geography, Shihezi University, Shihezi, Xinjiang 832000, China
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GE Benwei, LIU Anna. Natural radioactive environment of urban soils in Shihezi, China.Nuclear Science and Techniques, 2009, 20(6): 335-339     doi: 10.13538/j.1001-8042/nst.20.335-339

Abstract:

Radionuclides, such as 238U, 232Th and 40K, can be found in urban soil. To evaluate the natural radioactivity in the environment, soil samples were collected form Shihezi city and radioisotope concentrations were determined by X-ray fluorescence. The dose rate of urban soil (mGy per year, mGy/a) was calculated. The results indicate that the U, Th and K concentrations of the urban soils were, respectively, 1.2–3.2 mg/kg, 6.4–12.3 mg/kg and 2.05%–2.24%, with the mean values of 2.47 mg/kg, 10.47 mg/kg and 2.16 %. Dose rates of urban soils were 10.04–19.55 mGy/a with the mean value of 16.31 mGy/a. This dose rate is the perfect and maximum value of natural radiation in soil and different with the air absorbed dose rate from terrestrial γ-rays. The mean value of air absorbed dose rate was about 57.42 nGy/h. The annual effective dose rate in air was about 0.07 mSv/a and the average value of Raeq in urban soil was 120.37 Bq/kg. The relative contribution of α particle to the dose rate is higher than that derived from β- and γ-rays in the urban soils.

Key words: Natural radioactivity, Radioactive environment, Dose rate, Urban soil, Shihezi city