Horizontal Transport of 228RA/226RA in the Surface Water of Southern South China Sea and Malacca Straits

Che Abdul Rahim Mohamed, and Phuah, Chai Shia, Chai Shia and Nioo, Siew Yew, Siew Yew and Zaharuddin Ahmad, (2007) Horizontal Transport of 228RA/226RA in the Surface Water of Southern South China Sea and Malacca Straits. Malaysian Journal of Analytical Sciences, 11 (1). pp. 177-180. ISSN 13942506

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Affiliations

Universiti Kebangsaan Malaysia, Faculty of Science & Technology, Marine Ecosystem Research Center (EKOMAR)
Universiti Kebangsaan Malaysia, Faculty of Science & Technology, Marine Ecosystem Research Center (EKOMAR)
Malaysian Institute for Nuclear Technology Research

Abstract

Activity concentrations of 228Ra and 226Ra in the suspended particles from year 2002 to 2003 at the east coast and west coast Peninsular of Malaysia were determined using the Alpha and Beta Spectrometry, for estimating the horizontal transport of radium during the southwest and northeast monsoons. The suspended particles were acting as a vector for transport radium nuclides from the mainland to the ocean during monsoon seasons. At the same time, the radium nuclides in dissolved form were desorbed from the suspended particles. High distribution coefficient value (Kd) of radium isotopes were found in the southern South China Sea, indicate that radium nuclides were strongly absorbed onto the particulate phase. The Kd values of 226Ra and 228Ra were ranged from 0.78 × 105 L g-1 to 5.56 x 105 L g-1 and from 0.21 x 105 L g-1 to 1.86 x 105 L g-1,respectively.

Kepekatan aktiviti 228Ra dan 226Ra dalam bahan terampai dari tahun 2002 hingga 2003 di pantai timur dan pantai barat Semenanjung Malaysia telah diukur dengan menggunakan Spektrometri Alfa dan Beta. Ini adalah untuk menganggarkan pengangkutan mendatar radium yang ujud semasa monson barat daya dan timur laut. Pada masa yang sama didapati nuklid radium yang berada dalam fasa terlarut adalah terhasil dari rembesan bahan terampai. Nilai pekali taburan (Kd) bagi isotop radium adalah tinggi diperolehi di selatan Laut China Selatan mengambarkan nuklid radium kuat menyerap ke dalam fasa particulate. Nilai Kd bagi 226Ra dan 228Ra adalah berjulat dari 0.78 × 105 L g-1 - 5.56 x 105 L g-1 dan dari 0.21 x 105 L g-1 -1.86 x 105 L g-1, masing-masing.

Item Type:

Journal

Keywords:

228Ra and 226Ra; monsoon; suspended particles; southern South China Sea; Malacca Straits

Subjects:

Q Science

ID Code:

1038