|
KMID : 0385520080210060474
|
|
Analytical Science & Technology
2008 Volume.21 No. 6 p.474 ~ p.479
|
|
|
Natural radioactivity of surface sediments by source regions of the asian dust
|
|
Lee Kil-Yong
Yoon Yoon-Yeol
Cho Soo-Young
Koh Kyung-Seok
Kim Yong-Je
|
|
|
Abstract
|
|
|
|
Radioactivity of naturally occurring radioactive nuclides (NORN) such as 226Ra, 228Ac and 40K 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 226Ra in the three desert regions have almost same values in the range of mean value 17.9~21.9 Bq/㎏, however, the SA in Loess Plateau has much higher values in the mean value of 35 Bq/Kg. SA of 228Ac in the Ordos and Alashan desert regions have almost same values in the range of mean value 27.1~27.2 Bq/㎏, and those in Taklimakan desert and Loess Plateau were 31.7 and 49.0 Bq/㎏, respectively. In case of 40K, the SA in all regions have similar values in the range of 636~943 Bq/㎏. The mean SAR value of 226Ra/228Ac in four source regions was almost same in the range of 0.708-0.721. It is shown that relationship between 226Ra and 228Ac is clearly presented in the source regions. The mean SAR values of 226Ra/40K, 228Ac/40K are 0.0209-0.056, 0.0287-0.0773, respectively.
|
|
|
KEYWORD
|
|
|
China desert, Asian dust, surface sediment, natural radioactivity, gamma-ray spectrometry
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|