Document babwY5Bzd8R0wDooepxB2K1ek

Preliminary rust Survey for Asbestos Textile Institute June, 19*7 21. HI - P E Y S I C A I sigofic/oxe of bust counts Correlation between, development of nsbestosia enil some pertinent measure of dustiness, e.g., dU9t counts, con be developed by periodically oboerrlng end recording data on both aspects -- periodic medical examinations . of exposed workers together with the periodically measured dust exposure of each. Ecvever, to be useful for preventive purposes, thesoprocedures have to be extended into the past wherever data is svailab.o This vas the proced ure employed in the studies of the U,S,Public Health Service in North Carolina plants (Public Health Bulletin Ho. 241, 1938). ' The Chin value of dust counts in asbestos plants is to obtain data on duct concentrations that cen be compared with that study, end thus lead to conclusions es to probability of development of asbeBtosia in -the particular plant being studied. In that study, dustiness of different occupations was measured in the usual manner, and also the incidence of asbcst03ls by medical end x-ray examinations of the men employed, A statistical comparison of the two sets of data led tho investigators to the conclusion that new cases of asbestosis would probably not occur if dust control measures were undertaken to ensure that no dust exposures exceeded five nil11on particles per cubic foot (measured in the same manner). MBEPpaHfflg NITS 007912