Natural radioactivity of surface sediments by source regions of the asian dust

황사지역 발원지에 따른 표층퇴적물의 자연방사능 특성

  • Lee, Kil Yong ;
  • Yoon, Yoon Yeol ;
  • Cho, Soo Young ;
  • Koh, Kyung Seok ;
  • Kim, Yongje
  • 이길용 ;
  • 윤윤열 ;
  • 조수영 ;
  • 고경석 ;
  • 김용제
  • Received : 2008.10.06
  • Accepted : 2008.11.26
  • Published : 2008.12.25

Abstract

Radioactivity of naturally occurring radioactive nuclides (NORN) such as $^{226}Ra$, $^{228}Ac$ and $^{40}K$ were investigated for surface sediments collected from Ordos, Alashan, Taklimakan deserts and Loess plateau regions in China. By a Gamma-ray spectrometry, specific activity (SA) and SA ratio (SAR) of the NORN were determined for each source region of Asian dust. Characterization of the source regions of Asian dust was performed with the SA and SAR values. SA of $^{226}Ra$ in the three desert regions have almost same values in the range of mean value 17.9~21.9 Bq/kg, however, the SA in Loess Plateau has much higher values in the mean value of 35 Bq/Kg. SA of $^{228}Ac$ in the Ordos and Alashan desert regions have almost same values in the range of mean value 27.1~27.2 Bq/kg, and those in Taklimakan desert and Loess Plateau were 31.7 and 49.0 Bq/kg, respectively. In case of 40K, the SA in all regions have similar values in the range of 636~943 Bq/kg. The mean SAR value of $^{226}Ra/^{228}Ac$ in four source regions was almost same in the range of 0.708-0.721. It is shown that relationship between $^{226}Ra$ and $^{228}Ac$ is clearly presented in the source regions. The mean SAR values of $^{226}Ra/^{40}K$, $^{228}Ac/^{40}K$ are 0.0209-0.056, 0.0287-0.0773, respectively.

Keywords

China desert;Asian dust;surface sediment;natural radioactivity;gamma-ray spectrometry

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Acknowledgement

Grant : 청정 대용량 지하수자원 확보 기술 개발

Supported by : 한국지질자원연구원