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一、前言灰尘分散度是指灰尘颗粒大小的分散情况而言;一般是用百分比来表示。灰尘分散度越高,就表示小颗粒灰尘所占的比例越大。从卫生学的观点来评价生产环境的灰尘时,除用灰尘计重法及计数法来判断灰尘浓度外,尚须进行灰尘分散度的测定。因为直径大的灰尘(10微米以上)在空气中能迅速降落,即使被工人吸入,亦常被阻止於上呼吸道,而不易吸入肺泡致病。但直径小的灰尘(5—0.1微米)则降落很慢,甚或漂浮在空气中,并且容易吸入肺泡,引起尘肺。所以等量的灰尘浓度,由於灰
First, the preface Dust dispersion refers to the dispersion of dust particles in terms of size; generally expressed as a percentage. The higher the degree of dust dispersion, it means that the greater the proportion of small particles of dust. When evaluating the dust in the production environment from a hygienic point of view, it is necessary to measure the degree of dust dispersion in addition to determining the dust concentration by the method of dust weighting and counting. Because large diameter dust (10 microns or more) in the air can quickly fall, even if inhaled by workers, are often blocked in the upper respiratory tract, and not easy to inhalation of alveolar disease. However, the small diameter of the dust (5-0.1 microns) landed slowly, or even floating in the air, and easily inhaled alveolar, causing pneumoconiosis. So the same amount of dust concentration due to ash