Prevalence of radiographic small opacities in vermiculite miners.
Am J Ind Med 1987 Feb; 12(2):227-228
A letter relating to a recent study by the author, and others, on the radiological findings of vermiculite miners exposed to tremolite (14567738) fibers was presented. The study had described the relationship between cumulative exposure to the fibers and the prevalence of radiographic small opacities in miners. A reference had been made, as part of the comparison, to a study of Louisiana asbestos (1332214) cement workers, in which progression of radiographic small opacities was estimated. The author suggests that a better reference would have been to another study on asbestos cement workers in which the prevalence of small or rounded opacities, in relation to the number of particles per cubic foot month, was reported. A comparison of these results to those of the previous study by the author showed that the slope of the exposure response relationship was much higher for vermiculite miners than for the asbestos cement workers. The author concludes that the tremolite actinolite (13768008) fibers which contaminate Libby ore result in a greater risk for small radiographic opacities than the chrysotile (12001295) fibers in asbestos cement.
NIOSH-Author; Occupational-exposure; Mineral-dusts; Asbestos-mining; Fibrous-dusts; Radiographic-analysis; Lung-lesions
14567-73-8; 1332-21-4; 13768-00-8; 12001-29-5
American Journal of Industrial Medicine