George A C, Hinchliffe L, Sladowski R
Am Ind Hyg Assoc J. 1975 Jun;36(6):484-90. doi: 10.1080/0002889758507275.
The size distribution of radon daughters was measured in several uranium mines using four compact diffusion batteries and a round jet cascade impactor. Simultaneously, measurements were made of uncombined fractions of radon daughters, radon concentration, working level and particle concentration. The size distributions found for radon daughters were log normal. The activity median diameters ranged from 0.09 mum to 0.3 mum with a mean value of 0.17 mum. Geometric standard deviations were in the range from 1.3 to 4 with a mean value of 2.7. Uncombined fractions expressed in accordance with the ICRP definition ranged from 0.004 to 0.16 with a mean value of 0.04. The radon daughter sizes in these mines are greater than the sizes assumed by various authors in calculating respiratory tract dose. The disparity may reflect the widening use of diesel-powered equipment in large uranium mines.
使用四个紧凑型扩散电池和一个圆形喷射串联冲击器，在几个铀矿中测量了氡子体的粒径分布。同时，还对氡子体的未结合部分、氡浓度、工作水平和颗粒浓度进行了测量。发现氡子体的粒径分布呈对数正态分布。活度中值直径范围为0.09微米至0.3微米，平均值为0.17微米。几何标准差范围为1.3至4，平均值为2.7。按照国际辐射防护委员会（ICRP）的定义表示的未结合部分范围为0.004至0.16，平均值为0.04。这些矿山中的氡子体尺寸大于各作者在计算呼吸道剂量时所假设的尺寸。这种差异可能反映了大型铀矿中柴油动力设备使用的增加。
