SILICA CONTENT OF DUST FROM TANK RANGES
ARMY MEDICAL RESEARCH LAB FORT KNOX KY FORT KNOX United States
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In the Fort Knox tank training areas analyses have been made of surface soil and air-borne dust in tanks on maneuvers. The results are 1 surface soil samples from two distant tank ranges have a high concentration of silica with an average of 74.3 total silica and 63.9 free silica 2 the air-borne dust within tanks from the same two tank ranges contains an average of 21.5 by weight of particles below an equivalent diameter of three 3 microns 3 of the particles of air-borne dust less than three 3 microns in diameter, 10 is free silica 4 these particles of free silica less than three 3 microns in diameter constitute 2.2 by weight of the total dust. The question is raised whether such a concentration of highly siliceous dust, especially in the dangerous sizes less than ten 10 microns or three 3 microns in diameter, constitutes a medical hazard to operating armored personnel.