Ramli A Termizi, Hussein A Wahab M A, Wood A Khalik
Faculty of Science, Department of Physics, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia.
J Environ Radioact. 2005;80(3):287-304. doi: 10.1016/j.jenvrad.2004.06.008. Epub 2004 Dec 29.
Concentrations of uranium-238 and thorium-232 in soil, water, grass, moss and oil-palm fruit samples collected from an area of high background radiation were determined using neutron activation analysis (NAA). U-238 concentration in soil ranged from 4.9 mg kg(-1) (58.8 Bq kg(-1)) to 40.4 mg kg(-1) (484.8 Bq kg(-1)), Th-232 concentration ranged from 14.9 mg kg(-1) (59.6 Bq kg(-1)) to 301.0 mg kg(-1) (1204 Bq kg(-1)). The concentration of U-238 in grass samples ranged from below the detection limit to 0.076 mg kg(-1) (912 mBq kg(-1)), and Th-232 ranged from 0.008 mg kg(-1) (32 mBq kg(-1)) to 0.343 mg kg(-1) (1.372 Bq kg(-1)). U-238 content in water samples ranged from 0.33 mg kg(-1) (4.0 Bq L(-1)) to 1.40 mg kg(-1) (16.8 Bq L(-1)), and Th-232 ranged from 0.19 mg kg(-1) (0.76 Bq L(-1)) to 0.66 mg kg(-1) (2.64 Bq L(-1)). It can be said that the concentrations of environmental U-238 and Th-232 in grass and water samples in the study area are insignificant. Mosses were found to be possible bio-radiological indicators due to their high absorption of the heavy radioelements from the environment.
采用中子活化分析法（NAA）测定了从高本底辐射区域采集的土壤、水、草、苔藓和油棕果样品中铀 - 238和钍 - 232的浓度。土壤中U - 238浓度范围为4.9 mg kg⁻¹（58.8 Bq kg⁻¹）至40.4 mg kg⁻¹（484.8 Bq kg⁻¹），Th - 232浓度范围为14.9 mg kg⁻¹（59.6 Bq kg⁻¹）至301.0 mg kg⁻¹（1204 Bq kg⁻¹）。草样品中U - 238浓度范围从低于检测限至0.076 mg kg⁻¹（912 mBq kg⁻¹），Th - 232浓度范围为0.008 mg kg⁻¹（32 mBq kg⁻¹）至0.343 mg kg⁻¹（1.372 Bq kg⁻¹）。水样中U - 238含量范围为0.33 mg kg⁻¹（4.0 Bq L⁻¹）至1.40 mg kg⁻¹（16.8 Bq L⁻¹），Th - 232浓度范围为0.19 mg kg⁻¹（0.76 Bq L⁻¹）至0.66 mg kg⁻¹（2.64 Bq L⁻¹）。可以说，研究区域内草和水样中的环境U - 238和Th - 232浓度微不足道。由于苔藓从环境中对重放射性元素的高吸收，发现其可能是生物放射学指标。
