SUMMARY

New approach to establish the map of environmental radioactivity from the airborne
gamma-ray spectrometry data in the Nông Sơn area, Quảng Nam province

Nguyễn Văn Nam, Lê Văn Đạt

This article presents a new approach to establish the map of environmental radioactivity from the airborne gamma-ray spectrometry data. The method to establish the map of environmental gamma-ray dose rate in Nông Sưon, Quảng Nam province from the airborrne gamma-ray spectrometry data showed results: The map of environmental radioactivity in the Nong Son area accurately reflects the environmental gamma-ray dose rate (1 m) that the maps of radioactive content of U, Th and K have not shown yet. The distribution of the radioactive fields related directly to the content of radioactive elements of the geological objects in the study area. This result opens up a new method for mapping the environmental gamma-ray dose rate at the corresponding scale instead of direct measurement in areas where the airborne gamma-ray spectrum data was available. The map of environmental gamma-ray dose rate for Nông Sơn area was established and 04 areas with gamma-ray dose rate of >0.15 μSv/h are identified, in which the anomalous clusters> 0.20 μSv /h, including: Khe Hoa - Khe Cao; Cà Dy; Pà Lừa; An Điềm areas where have a potential risk of affecting the natural radioactive environment coinciding with the areas containing the radioactive ore bodies. The radioactive ore bodies were identified during the geological and mineral mapping. Therefore, exploiting and using this map to predict quickly the areas having the potential risk of environmental influences and the radioactive mineral potentials during measuring the airborne gamma-ray spectrum.

Keywords: Airborne gamma-ray spectrum, environmental gamma-ray dose rate, Nông Sơn, Quảng Nam.