ASTM F50-21
使用能够检测单个亚微米和更大颗粒的仪器连续调节和计数防尘区和洁净室中的空气中颗粒的标准做法
Standard Practice for Continuous Sizing and Counting of Airborne Particles in Dust-Controlled Areas and Clean Rooms Using Instruments Capable of Detecting Single Sub-Micrometre and Larger Particles