Surface Radiation Dose Measurement and Mapping of Jengka 15 Oil Palm Land
Zaini Hamzah, and Masitah Alias, and Ahmad Saat, and Abdul Khalik Hj. Wood, and Zakaria Tajuddin, (2007) Surface Radiation Dose Measurement and Mapping of Jengka 15 Oil Palm Land. Malaysian Journal of Analytical Sciences, 11 (1). pp. 237-245. ISSN 13942506 Full text not available from this repository. Official URL: http://pkukmweb.ukm.my/~mjas/v11_n1/36_624B5%20Edited-1.pdf AffiliationsUniversiti Teknologi MARA, Faculty of Applied Sciences
TNB Research Sdn. Bhd., Water and Air Laboratory
Universiti Teknologi MARA, Faculty of Applied Sciences
Malaysian Institute for Nuclear Technology Research
Universiti Teknologi MARA, Faculty of Applied Sciences AbstractMeasurement of surface radiation dose will give an indication of how strong the radiation originating from the soil. The measurement value is related to the concentration of uranium and thorium in the soil. In this study, oil palm plantation area in Jengka 15 was chosen as a study area, since it has a variation in the surface conditions of the land i.e. slopes, flat and catchments area. Furthermore, it is close to the forest reserved area, which has been used as a control area. The soil samples were taken using hand auger up to 20 cm depth. The surface dose rate measurements were done in-situ using portable radiation survey meter Ludlum model 2241. The uranium and thorium concentrations were analyzed by neutron activation analysis technique using the Malaysian Institute for Nuclear Technology Research (MINT) facilities. The mean value for surface dose rates were 0.132, 0.122, 0.125, 0.140, 0.123 and 0.160 mSv/hr for flat area 1, flat area 2, slope area1, slope area 2, catchments and forest area respectively. The mean uranium concentrations are 3.0 ± 0.2, 2.0 ± 0.2, 2.0 ± 0.2, 2.0 ± 0.2, 3.1 ± 0.2, and 2.6 ± 0.2 mg/g for flat area 1, flat area 2, slope 1, slope 2, catchments and forest area respectively. The mean thorium concentrations are 7.7 ± 0.3, 6.9 ± 0.2, 3.9 ± 0.01, 4.3 ± 0.2, 11.4 ± 0.4 and 7.7 ± 0.0.2 mg/g for flat area 1, flat area 2, slope 1, slope 2, catchments and forest area respectively.
Pengukuran dos radiasi permukaan akan memberi indikasi tentang kekuatan punca radiasi dari dalam tanah. Nilai pengukuran adalah berkaitan dengan kepekatan uranium dan thorium di dalam tanah. Di dalam kajian ini, satu kawasan tanaman kelapa sawit di Jengka 15 telah dipilih sebagai kawasan kajian kerana ia mempunyai keadaan permukaan yang pelbagai iaitu cerun, tanah rata dan berpaya. Kawasan ini juga berhampiran dengan kawasan hutan simpan kekal, yang dijadikan sebagai rujukan. Sampel tanah diambil menggunakan ‘auger’ sehingga ke kedalaman 20 cm. Kadar dos permukaan diukur menggunakan meter pengukur radiasi, Ludlum model 2241. Kepekatan uranium dan thorium ditentukan menggunakan teknik analisis pengkatifan neutron menggunakan kemudahan yang terdapat di Institut Penyelidikan Teknologi Nuklear Malaysia (MINT). Nilai purata bagi kadar dos permukaan adalah 0.132, 0.122, 0.125, 0.140, 0.123 dan 0.160 mSv/j untuk kawasan rata 1, kawasan rata 2, cerun 1, cerun 2, kawasan berpaya dan kawasan hutan masing-masing. Purata kepekatan uranium adalah 3.0 ± 0.2, 2.0 ± 0.2, 2.0 ± 0.2, 2.0 ± 0.2, 3.1 ± 0.2, dan 2.6 ± 0.2 mg/g untuk kawasan rata 1, kawasan rata 2, cerun 1, cerun 2, kawasan berpaya dan kawasan hutan masing-masing. Purata kepekatan thorium adalah 7.7 ± 0.3, 6.9 ± 0.2, 3.9 ± 0.01, 4.3 ± 0.2, 11.4 ± 0.4 dan 7.7 ± 0.0.2 mg/g untuk kawasan rata 1, kawasan rata 2, cerun 1,
cerun 2, kawasan berpaya dan kawasan hutan masing-masing. | Item Type: | Journal |
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| Additional Information: | I would like to thank IRDC, UiTM for the research grant given to this project. To UiTM Jengka Lab Staffs for their assistant and to Dr Abdul Khalik Wood (MINT) |
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| Keywords: | Isodose, surface dose rate, soil, neutron activation analysis |
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| Subjects: | Q Science |
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| ID Code: | 1051 |
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