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
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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