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Ali Arman Lubis
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FLUKS DEPOSISI Zn DAN Cr DI MUARA CISADANE BERDASARKAN PROFIL 210Pb UNSUPPORTED DAN SIKLUS BANJIR 5 TAHUNAN Barokah Aliyanta; Ali Arman Lubis
Jurnal Ilmiah Aplikasi Isotop dan Radiasi Vol 3, No 1 (2007): Juni 2007
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (194.822 KB) | DOI: 10.17146/jair.2007.3.1.551

Abstract

Pengukuran profil 210Pb unsupported dan logam berat Zn, Cr pada sedimen di Muara Cisadane telah dilakukan pada tahun 2002. Kedua sedimen core diambil masing-masing di Muara Tanjung Burung dan Muara Tiang Sampan. Profil 210Pb unsupported dapat digunakan untuk menghitung laju pengendapan dan untuk menghitung fluks deposisi Zn dan Cr berdasarkan siklus waktu 5 tahunan. Laju pengendapan sedimen kering di Muara Tanjung Burung adalah 4,142 gr/cm2/th, 2,518 gr/cm2/th dan 1,27 gr/cm2/th masing-masing untuk periode 1997- 2002, 1992-1997 dan 1987-1992. Laju pengendapan pada Muara Tiang Sampan sebesar 3,626 gr/cm2/th, 2,8 gr/cm2/th dan 1,41 gr/cm2/th masing-masing untuk periode 1997-2002, 1992-1997 dan 1987-1992. Fluks deposisi Zn : Cr di Muara Tanjung Burung adalah 4,867 gr/m2/th : 0,9 gr/m2/th, 3,515 gr/m2/th : 0,69 gr/m2/th dan 1,363 gr/m2/th : 0,2 gr/m2/th; masing-masing untuk periode 1997- 2002, 1992-1997 dan 1987-1992. Fluks deposisi Zn:Cr di Muara Tiang Sampan adalah 3,368 gr/m2/th : 0,703 gr/m2/th, 2,814 gr/m2/th : 0,574 gr/m2/th dan 1,593 gr/m2/th : 0,303 gr/m2/th; masing-masing untuk periode 1997- 2002, 1992-1997 dan 1987-1992.
DISTRIBUTION OF NATURAL AND ANTHROPOGENIC RADIONUCLIDES IN SURFICIAL SEDIMENTS OF JAKARTA Ali Arman Lubis
Jurnal Ilmiah Aplikasi Isotop dan Radiasi Vol 2, No 2 (2006): Desember 2006
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jair.2006.2.2.570

Abstract

The concentration and distribution of natural and anthropogenic radionuclide in surficial sediments of Jakarta Bay were investigated with the aim of evaluating its level and environmental radioactivity. Sediments were sampled in 30 locations using Smith-McIntyre Grab sampler. Sediments were dried, homogenized and sealed for 1 month for equilibration and for the detection, analysis and data acquisition, a high purity germanium (HPGe) detector coupled with a high resolution multichannel analyzer (MCA) was used. Additionally, the grain sizes were analyzed by means of hydrometer. The result shows that the specific activity of 238U, 226Ra, 232Th, 40K and 137Cs range from 6.71±1.01 Bq/kg to 28.63±4.29 Bq/kg, 6.46±0.97 Bq/kg to 28.21±4.23 Bq/kg, 16.62±2.49 Bq/kg to 40.46±6.07 Bq/kg, 115.80±12.16 Bq/kg to358.69±30.49 Bq/kg, and 0.03±0.01 Bq/kg to 1.99±0.34 Bq/kg with the average value are 12.83±2.11 Bq/kg, 12.03±1.98 Bq/kg, 26.55±4.36 Bq/kg, 235.55±19.37 Bq/kg, and 0.77±0.13 Bq/g, respectively. It shows that the activity of radionuclides in the research area are in natural level and the variation may be influenced by the grain size distribution in the sample. The absorbed dose rate and radium equivalent of gamma radiation was estimated to be 32.06±7.72 nanoGrey/h and 68.14±11.20Bq/kg, respectively.
Co-Authors Barokah Aliyanta