The Malaysian Journal of Analytical Sciences Vol 12 No 1 (2008): 160 – 166

 

 

AKTIVITI ²²⁶Ra DAN ²²⁸Ra PADA PERMUKAAN SEDIMEN BAGAN LALANG, SELANGOR

 

Che Abd Rahim Mohamed¹_, Zaharuddin Ahmad²  dan Nioo Siew Yew²

 

¹Pusat Pengajian Sains Sekitaran Dan Sumber Alam, Fakulti Sains Dan Teknologi,

 Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

²Agensi Nuklear Malaysia, Bangi, 43000 Kajang, Selangor, Malaysia

 

 

Abstract

Six stations had selected from Sungai Sepang Kechil, Selangor during Mac, September and October 2004  for sediment analysis. The results showed a significant difference among the ²²⁶Ra and ²²⁸Ra activities (P < 0.01) with sampling period. The highest activities of ²²⁶Ra and ²²⁸Ra have obtained during the sampling on  Mac, which show the average activities 161.30 Bq kg^-1   and 466.88 Bq kg^-1, respectively. Meanwhile, ²²⁶Ra activities obtained on September and October are in the average of 24.77 Bq kg^-1   and 69.22 Bq kg^-1, respectively. Average activities of ²²⁸Ra are 73.13 Bq kg^-1 and 1284.58 Bq kg^-1, respectively for September and October. Northeast Monsoon effect might cause the higher activities of  radium isotopes during sampling on Mac. Sediments from Bagan Lalang are sandy type with a limited size variation. Furthermore, radium isotopes are more adsorbed on the particles sediments between size 63 – 125 µm, which usually rich in alkaline feldspar.

 

Key words: ²²⁶Ra, ²²⁸Ra, sediment

 

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