THE CALIBRATION OF A MODIFIED ANDERSEN BACTERIAL AEROSOL SAMPLER
ARMY BIOLOGICAL LABS FREDERICK MD
Pagination or Media Count:
A study of the flow regime in the commercial Andersen Sampler revealed defects in the sampling of the larger air-borne particles. Satisfactory sampling was obtained by redesigning the hole pattern of the top stages and adding one more stage to extend the range of the instrument. A new, rational, hole pattern is suggested for the lower stages. With both patterns a special colony-counting mask can be used to facilitate the assay. A calibration of the modified system is presented that enables particle size distribution curves to be drawn from the colony counts.