Burkhart J E, McCawley M A, Wheeler R W
Am Ind Hyg Assoc J. 1987 Feb;48(2):122-6. doi: 10.1080/15298668791384508.
This paper reports the results of a sampling program undertaken by NIOSH to determine the particle size distributions in underground coal mines. The program made use of newly developed cascade impactors capable of being operated with personal sampling pumps. Particle size distribution samples were collected at selected areas in 10 continuous mining sections in three states. Results plotted as mass frequency distributions indicate that a bimodal distribution may exist in areas away from the operations of the continuous miner. A primary size mode of about 17 micron and a secondary size mode of about 5 micron were measured consistently throughout the 10 mines studied.
本文报告了美国国家职业安全与健康研究所（NIOSH）开展的一项抽样计划的结果，该计划旨在确定地下煤矿中的粒度分布。该计划使用了新开发的能够与个人采样泵一起操作的级联冲击器。在三个州的10个连续开采区的选定区域收集了粒度分布样本。绘制为质量频率分布的结果表明，在远离连续采煤机作业的区域可能存在双峰分布。在所研究的10个煤矿中，始终测量到约17微米的主要粒度模式和约5微米的次要粒度模式。
