Mustonen R, Jantunen M
Health Phys. 1985 Dec;49(6):1251-60. doi: 10.1097/00004032-198512000-00021.
Concentrations of gamma-emitting natural radionuclides and 137Cs were analyzed in the size fractionated fly-ash emissions from a 100-MWt peat- and oil-fired power plant. The emitted fly ash was separated into five size fractions with a high-volume impactor with cut sizes of 1.3 micron, 2.1 micron, 4.2 micron and 10 micron. The greatest activity emissions were associated with the smallest size fraction, below 1.3 micron. The mass median aerodynamic diameter (MMAD) of the fly-ash particles after the electrostatic precipitator was 1.9 micron with a geometric standard deviation of 3.0 and the median of the 32 fly-ash emission samples was 8.73 mg MJ-1 with a geometric standard deviation of 1.3. Lead-210 gave the greatest particulate activity emission per input fuel energy, 18.7 mBq MJ-1, and showed a strong enrichment onto small fly-ash particles.
对一座100兆瓦热功率的泥炭和燃油发电厂排放的飞灰进行了粒径分级，并分析了其中γ发射天然放射性核素和137Cs的浓度。利用大流量冲击器将排放的飞灰分离成五个粒径级分，切割粒径分别为1.3微米、2.1微米、4.2微米和10微米。最大的活度排放与最小的粒径级分（小于1.3微米）相关。静电除尘器后飞灰颗粒的质量中位空气动力学直径（MMAD）为1.9微米，几何标准差为3.0，32个飞灰排放样品的中位数为8.73毫克/兆焦，几何标准差为1.3。铅-210每输入燃料能量的颗粒活度排放最大，为18.7毫贝克勒尔/兆焦，并且在小飞灰颗粒上有强烈富集。
