硫化鉱焼滓による一塵肺のレ線学的考察

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This is report of investigation in a case of silicosis occurred in one of the processes of manufacturing sulfuric acid. No report of this kind seems to have ever been appeared in the medical literature. The present author first investigated the case chiefly by radiological observation, in reference with various radiographs of other dust pneumoconiosis, and secondly studied possible causes by examination of the influence of SO_2 gas on the lung and that of chemical, mineralogical nature of the dust concerned. He reached the following conclusions. 1) SO_2 gas can be a cause of pulmonary fibrosis, and may be regarded in dust-producing factories as an agent that produces and aggravates pneumoconiosis. 2) A progressive silicosis is caused by the dust of oxidized iron with less amount of free silica. 3) Amorphous form of free silica-opal-is changed into crystal α-quartz by heating (800-900℃). As to influences on the living body of the dust of these two minerals those of the latter is greater. This may be one of the reasons of less frequency of the case of silicosis in sulfur mines. Yet this is suggestive to the occurrence of silicosis discussed in this paper. 4) In welders roentgenological observation revealed only slight changes in the chest without any progressive symptoms.
社団法人日本産業衛生学会の論文