Wednesday, December 19, 2012

SKAM23PaperAfiqah



MEASUREMENT OF 226Ra, 228Ra AND 40K IN SOIL IN DISTRICT OF KUALA KRAI USING GAMMA SPECTROMETRY
(Pengukuran 226Ra, 228Ra dan 40K di dalam taneh daerah Kuala Krai menggunakan spektrometri gama)
Zaini Hamzah1, Siti Afiqah Abdul Rahman1, and Ahmad Saat2

1Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam
1Institute of Science, Universiti Teknologi MARA, 40450 Shah Alam

Corresponding author e-mail: siti_afiqah@ymail.com


Abstract

The granitic region is known to have high natural radionuclides content. The natural background of the area will be elevated and the exposure rate also will be higher as compared to other region. The present study is focusing on the presence of natural uranium isotopes using its progenies in soils belong to the river basin of the granitic region of Kuala Krai district, Malaysia. Granitic characteristics of the region were believed to produce significant concentrations of natural radionuclide such as uranium and thorium. This paper presents the results of measurement activity concentration 226Ra, 228Ra and 40K in soil using Gamma Spectrometry to estimate activity concentration of radionuclides in fourteen soil samples collected from this study area. The range of activity concentration of 226Ra, 228Ra and 40K is 40.2-264.0, 49.2-312.9 and 491.1-1184.2 Bq/kg respectively. These results were used to estimate the hazards index and annual exposure rate to the member of public.

Keywords: 238U activity concentration, granitic region, gamma spectrometer

Abstrak

Kawasan granatik telah diketahui mempunyai kandungan radionuklida tabii yang tinggi. Kadar sinaran latar kawasan tersebut juga akan tinggi dan kadar pendedahan terhadap manusia juga akan lebih tinggi berbanding dengan kawasan lain. Kajian ini memberikan fokus kepada pengesanan isotop uranium tabii menggunakan progeninya di dalam taneh yang di ambil dari kawasan granit di Daerah Kuala Krai, Malaysia. Sifat-sifat granitik kawasan ini dipercayai mempunyai kepekatan radionuklida tabii seperti uranium dan torium yang signifikan. Kertas kerja ini membentangkan hasil kajian pengukuran 226Ra, 228Ra dan 40K di dalam taneh menggunakan spektrometri gama bagi menentukan kepekatan aktiviti radionuklida di dalam empat belas sampel taneh dari kawasan kajian. Julat pengukuran bagi 226Ra, 228Ra dan 40K masing-masing 40.2-264.0, 49.2-312.9 dan 491.1-1184.2 Bq/kg.  Keputusan ini telah digunakan untuk mengira indeks berbahaya dan kadar pendedahan tahunan terhadap penduduk setempat.

Kata kunci: Kepekatan aktiviti 238U, kawasan granit, spektrometer gama

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