The Malaysian Journal of Analytical Sciences, Vol 10 No 1 (2006): 35 – 40

 

 

 

ANALISIS ²³⁸U, ²³²Th, ²²⁶Ra dan ⁴⁰K DALAM SAMPEL AMANG, TANAH DAN AIR DI DENGKIL, SELANGOR MENGGUNAKAN

SPEKTROMETRI GAMA

 

 

Muhamad Samudi Yasir¹, Amran Ab.Majid², Farhana Ibrahim, Siti Qalila Mohd Tap dan Mohd,

Rashidan Zainol Abidin

 

¹Pusat Pengajian Fizik Gunaan, Fakulti Sains dan Teknologi,

²Pusat Pengajian Sains Kimia dan Teknologi Makanan,

Fakulti Sains dan Teknologi, Universiti Kebangsaan Malaysia,

43600 Bangi, Selangor Darul Ehsan

 

Abstract

Several  samples of pure and unprocessed amang minerals, soil and water in Dengkil, Selangor have been determined for their natural radioactivity content using the gamma spectrometry. The sampling areas were included the amang plant surrounding, housing estate and E-village sites.  The result shows that the activity concentration (Bq/kg) of ²³⁸U, ²³²Th, ²²⁶Ra and ⁴⁰K in samples were in the ranged of 52.83 -  3538.94, 24.45 -  13426.68, 149.63 -  22011.87 and 108.04 -  3773.15, respectively.   While the activity concentration (Bq/kg) of ²³⁸U, ²³²Th, ²²⁶Ra and ⁴⁰K in the soil samples were in the ranged of 31.64 - 449.15, 27.37 - 103.08, 20.07 -   976.65 and 181.74 -  462.42, respectively.   While in the water samples the activity concentration (Bq/L) of 238U, 232Th, 226Ra and 40K were in the ranged of 1.40 -  1.63, 1.57 -  1.65, not detected -  1.14 and 10.51 -  12.06, respectively. In general, the activity concentration of ²³⁸U and ²²⁶Ra were highest in the unprocessed ilmenite and pure zircon samples, whereas, the highest activity concentration of ²³²Th were found in the pure and unprocessed monazite samples.  The activity concentration of ²³⁸U, 232Th and ²²⁶Ra in soil and water samples were found to be much higher in sampling area closed to the amang processing plant.  Despite high specific radioactivity of ²²⁶Ra in the amang samples, the calculated annual equivalent dose was still lower than annual equivalent dose limit for the public, i.e., 1 mSv/yr.

 

Keywords: amang, soil, water,  radionuklid ²³⁸U, ²³²Th, ²²⁶Ra dan ⁴⁰K, equivalent dose.

 

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