Baby Powder の衛生学的研究 (その1) : 新生児・乳幼児・学童の肺組織内の石英, 滑石について

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In daily living, a great quantity of sand, mineral dusts and talc powders containing α-quartz or talc particles is inhaled. To recognize the effects of such mineral dusts, lung preparations of newborns, infants and school children were examined with a polarizing microscope.Findings are as follows on the quartz and talc examinations:1) Many particles of quartz and talc derived from baby powder are found in lung preparations of infants and school children.2) Amount of quartz particles in the lung tissue (Q) is shown as the function of the living age (M: months).Q=18√M+38 (SQ=±28.66)Thus, quartz deposited in the lung tissue increases in proportion to a square root of living age with a large variance resulting from the enviromental situations of subjects.3) Amount of talc particles in the lung tissue (T) is also given as the function of the living age (M).T=2.5√M+38 (ST=±14.89)In other words, talc particles deposit in the lung tissue very slowly, and show a small variance. Those talc particles are seemingly derived from inhalation of the baby powder.4) All dusts deposited in the lung tissue are below 20μ in size and mostly are ranging between 3 and 5μ.5) No remarkable tissue changes are found at foci of deposition of mineral dusts.
日本衛生学会の論文