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All Journal JOURNAL OF COASTAL DEVELOPMENT Jurnal Matematika & Sains
Ali Arman Lubis
Kelompok Kelautan dan Lingkungan, Pusat Aplikasi Teknologi Isotop dan Radiasi Badan Tenaga Nuklir Nasional, BATAN
Education Mathematics

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Uncertainty Assessment of Alpha-Spectrometry Analysis of 210Po in Marine Sediment Sample from Jakarta Bay Ali Arman Lubis
Jurnal Matematika & Sains Vol 13, No 2 (2008)
Publisher : Institut Teknologi Bandung

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Abstract

The expression of measurement uncertainties in a standardized form is a requirement for result reliability as it imposesimplications to the interpretation of analytical results. In this work, the analytical procedure involves samplepreparation steps for drying, dissolution and further radiochemical separation, self deposition and counting of 210Po ofmarine sediment sample are discussed. An isotopic tracer (209Po) is used to determine the overall chemical yield and toensure traceability to a national standard. The uncertainty assessment of 210Po is discussed using marine sedimentsample from Jakarta Bay with quality assurance based on Standard Reference Material, International Atomic EnergyAgency, No. 300 (SRM IAEA-300) and SRM IAEA-368 for marine sediments. 210Po is measured by a PIPS detectorcoupled to a multichannel spectrometer. The contribution of the sources to the expanded standard uncertainty in theconcentration of 210Po in marine sediment is assessed and the sample activity which contributed 71.10% of total isidentified as the major contribution.
CONSTANT RATE OF SUPPLY (CRS) MODEL FOR DETERMINING THE SEDIMENT ACCUMULATION RATES IN THE COASTAL AREA USING 210Pb Ali Arman Lubis
JOURNAL OF COASTAL DEVELOPMENT Vol 10, No 1 (2006): Volume 10, Number 1, Year 2006
Publisher : JOURNAL OF COASTAL DEVELOPMENT

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Abstract

A CRS model has been applied to determine the ages and accumulation rates of sediment. This model assumes a constant flux of unsupported 210Pb to the sediment, allows the rate of sedimentation to vary over time. The applicable of CRS model was used to analysis of two bottom sediment cores (JB 17 and JB 11) from Jakarta Bay. The result show that sediment accumulation rates in JB 17 varied from 0.09 to 1.13 kg.m-2.y-1 and in JB 11 varied from 0.18 to 2.47 kg.m-2.y-1.
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