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Sains Malaysiana 47(9)(2018): 2151–2156 http://dx.doi.org/10.17576/jsm-2018-4709-24 Penentuan Kepekatan Aktiviti
Radionuklid Tabii
232th,
238u
dan 40k dalam
Ikan di Pesisiran
Pantai Terengganu, Malaysia (Determination of Concentration Activity Natural Radionuclide
232th, 238u
and 40k in Fish at the Coastal Area of Terengganu,
Malaysia) MNR ROSLI1*, SB
SAMAT1,
MS
YASIR1
& MF MOHD YUSOF2 1Pusat Pengajian
Fizik Gunaan,
Fakulti Sains dan
Teknologi, Universiti
Kebangsaan Malaysia, 43600 UKM Bangi,
Selangor Darul Ehsan, Malaysia 2Pusat Pengajian
Sains Kesihatan,
Kampus Kesihatan, Universiti Sains Malaysia, 16150
Kubang Kerian, Kelantan Darul Naim, Malaysia Received: 3 August
2017/Accepted: 9 May 2018 ABSTRAK Penentuan 232Th,
238U
dan 40K dalam
10 spesies ikan
yang ditangkap dari 3 lokasi di kawasan pesisiran pantai Terengganu, Malaysia
menggunakan teknik
ICP-MS.
Tahap kepekatan
aktiviti (Bq kg-1 berat kering) didapati
berbeza daripada
2.72 × 10-4 ±
1.96 × 10-4 hingga
50.66 × 10-4 ± 34.57
× 10-4 bagi 232Th, 0.96 × 10-3 ±
0.37 × 10-3 hingga
10.04 × 10-3 ± 5.09
× 10-3 bagi
238U
dan 36.70 ± 17.53 hingga
82.38 ± 27.65 bagi 40K.
Berdasarkan kepekatan aktiviti radionuklid, dos berkesan tahunan dan risiko
kanser telah
dianggarkan. Keputusan kajian menunjukkan bahawa dos berkesan kolektif (mSv tahun-1)
dianggarkan 2.47 × 10-5 bagi 232Th, 6.52 × 10-6 bagi 238U dan 1.9
× 10-2 bagi
40K
adalah jauh
lebih rendah daripada
saranan UNSCEAR. Risiko kanser
bagi orang dewasa
yang dianggarkan daripada dos berkesan tahunan adalah 66.9 × 10-6. Nilai ini adalah
jauh lebih
rendah daripada faktor risiko kanser
UNSCEAR
iaitu 8.4 × 10-3 dan faktor risiko
kanser ICRP sebanyak
3.5 × 10-3. Kajian ini menyimpulkan
bahawa dos yang diterima
oleh penduduk setempat
hasil daripada
pengambilan ikan agak rendah dan
tidak membahayakan
kesihatan manusia dan selamat untuk
dimakan. Kata kunci: Dos dedahan dalaman; kepekatan aktiviti; radionuklid tabii; risiko kanser; spektrometri jisim-plasma gandingan teraruh ABSTRACT Determination of 40K,
232Th
and 238U in 10 fish species caught from 3 locations in the coastal
area of Terengganu, Malaysia were determined using ICP-MS technique. The activity concentration varies from 36.70 ± 17.53 to
82.38 ± 27.65 for 40K, 2.72 × 10-4 ±
1.96 × 10-4 to 50.66 × 10-4 ±
34.57× 10-4 for 232Th
and 0.96 × 10-3 ± 0.37
× 10-3 to 10.04 × 10-3 ±
5.09 × 10-3 for 238U.
Based on activity concentration, annual effective dose and cancer
risk were estimated. The results showed that the collective
effective doses (mSv year-1) were estimated to be
2.47 × 10-5 for 232Th,
6.52 × 10-6 for 238U
and 1.9 × 10-2 for
40K
is much lower than the UNSCEAR recommendation.
Cancer risk for adults estimated from annual
effective dose are 66.9 × 10-6. This value are
much lower than UNSCEAR cancer risk factor of 8.4 ×
10-3 and ICRP cancer
risk factor of 3.5 × 10-3. The present study concludes
that the dose received by the locals due to consumption of fish
rather small and did not deteriorate human’s health and safe
for consumption. Keywords: Activity concentration;
cancer risk; inductive coupled plasma-mass spectrometry; ingestion
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