Malaysian Journal of Analytical Sciences Vol 18 No 1 (2014): 127 – 139

 

 

 

NATURAL ISOTOPE RADIUM IN MARINE BIOTA AT KAPAR, KLANG COASTAL AREA

 

(Isotop Radium Semulajadi Dalam Biota Marin Di Pesisiran Pantai Kapar, Klang)

 

Nik Azlin Nik Ariffin¹* and Che Abd Rahim Mohamed²

 

¹Fakulti Sains Gunaan,

Universiti Teknologi MARA, 40450 Shah Alam, Selangor Darul Ehsan, Malaysia

²Fakulti Sains dan Teknologi,

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

*Corresponding author: azlin_ariffin@salam.uitm.edu.my

 

 

Abstrak

Kepekatan aktiviti ²²⁶Ra dan ²²⁸Ra dalam biota marin di pesisiran pantai Kapar berdekatan dengan Stesen Janakuasa Sultan Salahudin Abdul Aziz Shah (SJSSAAS) telah di analisis. Teknik yang digunakan untuk penentuan kepekatan aktiviti ²²⁶Ra dan ²²⁸Ra ialah teknik pemisah radiokimia dengan menggunakan turus pemisah penukar kation dan Pembilang Sintilator Cecair (LSC). Hasil kajian menunjukkan taburan isotop-isotop radium yang dicerap bergantung pada masa pensampelan dan lokasi kajian. Kepekatan aktiviti-aktiviti ²²⁶Rai dan ²²⁸Rai dalam isi ikan masing-masing mempunyai julat 11.82 ± 5.23 Bq/kg – 17.67 ± 6.81 Bq/kg dan 40.42 ± 16.20 Bq/kg – 67.86 ± 23.11 Bq/kg. Purata kepekatan aktiviti isotop radium dalam bivalvia seperti kerang (anadara granosa) adalah 61.73 ± 24.15 Bq/kg (²²⁶Raag) dan 232.62 ± 119.44 Bq/kg (²²⁸Raag). Manakala kupang (perna viridis) pula, purata kepekatan dalam ²²⁶Rapv dan ²²⁸Rapv masing-masing adalah 38.24 ± 14.19 Bq/kg dan 99.59 ± 44.91 Bq/kg. Faktor kepekatan (CF) bagi biota marin adalah lebih rendah daripada 1 x 10⁴ dan ini adalah kerana isotop radium yang terkumpul adalah rendah dan mempunyai afiniti yang tinggi terhadap bahan organik. Kajian ini juga menunjukkan dos keberkesanan dalam isotop radium telah diukur bagi memastikan tahap keselamatan terhadap pengguna dan ianya masih dibawah had yang telah dibenarkan Malaysia iaitu 1 mSv/tahun.

 

Kata kunci: Isotop radium, biota marin, faktor kepekatan, dos keberkesanan

 

Abstract

The activities concentration of ²²⁶Ra and ²²⁸Ra in marine biota at Kapar coastal area nearby Sultan Salahudin Abdul Aziz Shah Power Station (SJSSAAS) had been analyzed. The techniques that had been used to determine the activities concentration of ²²⁶Ra dan ²²⁸Ra are radiocnhemistry procedures and liquid scintillation counter (LSC). Results shows that the distribution of radium isotopes depend on the location and during sampling periods. The activities concentration of ²²⁶Rai and ²²⁸Rai in tissue were ranged 11.82 ± 5.23 Bq/kg – 17.67 ± 6.81 Bq/kg and 40.42 ± 16.20 Bq/kg – 67.86 ± 23.11 Bq/kg, respectively. The mean activities concentration of radium isotopes in bivalvia such as cockles (anadara granosa) are 61.73 ± 24.15 Bq/kg (226Raag) and 232.62 ± 119.44 Bq/kg (228Raag). Meanwhile for green mussles (perna viridis), the mean activities concentration of ²²⁶Rapv dan ²²⁸Rapv are 38.24 ± 14.19 Bq/kg dan 99.59 ± 44.91 Bq/kg, respectively. Concentration Factor (CF) in marine biota is higher than 1 x 10⁴ and it is because of the accumulated radium isotopes is low and has a high affinity for organic matter. The study also shows the effectiveness of dose in radium isotopes were measured to ensure the safety of users and it is still below the limit allowed Malaysia which is 1 mSv / year.

 

Keywords: Radium isotopes, marine biota, concentration factor, effective dose

 

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