Jibiri N N, Ajao A O
Department of Physics, University of Ibadan, Ibadan, Nigeria.
J Environ Radioact. 2005;78(1):105-11. doi: 10.1016/j.jenvrad.2004.02.007.
Samples of elephant grass collected at some pasturing farmlands across different locations in Ibadan metropolis were analyzed for their natural radioactivity concentrations due to 40K, 238U and 232Th radionuclides. Radioactivity measurements were carried out using gamma-ray spectroscopy. The average radioactivity concentration of 40K was found to be 25.7+/-5.5 Bq kg(-1) for 238U and 33.4+/-3.9 Bq kg(-1) for 232Th. The radiological health implication to the population that may result from these values is found to be very low and almost insignificant. No artificial radionuclide, however, was detected in any of the samples, hence, measurements have been taken as representing baseline values of these radionuclides in the grass in the metropolis.
对在伊巴丹市不同地点的一些牧场采集的象草样本进行了分析，以测定其因40K、238U和232Th放射性核素而产生的天然放射性浓度。使用伽马射线光谱法进行放射性测量。发现40K的平均放射性浓度为25.7±5.5 Bq kg(-1)，238U为该值，232Th为33.4±3.9 Bq kg(-1)。发现这些数值可能对人群产生的放射健康影响非常低，几乎可以忽略不计。然而，在任何样本中均未检测到人工放射性核素，因此，这些测量结果被视为代表该市草中这些放射性核素的基线值。
