Weng Y H, Chu T C
Institute of Nuclear Science, National Tsing Hua University, Hsinchu, Taiwan, Republic of China.
J Radiat Res. 1992 Jun;33(2):141-50. doi: 10.1269/jrr.33.141.
Coal, fly ash and bottom ash samples were taken from a 300-MWe coal-fired power plant with a daily coal consumption of 2400 tons. A high volume sampler coupled with several mesh testing sieves was used to separate fly ash samples into different size fractions. Determination of the concentrations of 40K, 238U, 226Ra, 210Pb, 210Po, 228Th and 228Ra was carried out either by gamma or alpha spectrometry. For elements volatilized during combustion, their radionuclide concentrations decrease with increasing particle size. The enrichment factors for all radionuclides mentioned above were studied. Their values range from 31.0 for 210Po to 2.2 for 228Ra. Of all radionuclides studied, 210Po and 210Pb are the most volatile elements; therefore, an increase in the natural radiation level should first be indicated by an increase in these two nuclides.
煤、飞灰和底灰样本取自一座装机容量为300兆瓦的燃煤发电厂，该厂日耗煤量为2400吨。使用一个大容量采样器和几个筛孔测试筛将飞灰样本分离成不同粒径级分。通过伽马能谱法或阿尔法能谱法测定了40K、238U、226Ra、210Pb、210Po、228Th和228Ra的浓度。对于燃烧过程中挥发的元素，其放射性核素浓度随粒径增大而降低。研究了上述所有放射性核素的富集因子。其值范围从210Po的31.0到228Ra的2.2。在所有研究的放射性核素中，210Po和210Pb是挥发性最强的元素；因此，天然辐射水平的增加首先应表现为这两种核素含量的增加。
