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我们于1981年起对此项工作进行了3年的观察,其结果是①发现了因长期吸入粉笔粉尘的教师引起的尘肺1例,诊断为Ⅰ期。其X线主要表现为由肺间质纤维化所致的细网和密集的小圆形阴影,密度较淡,边缘不清,大小在1.5mm以下,以两肺中下野为著,肺功能代偿为乙类。②长期吸入粉笔粉尘可使肺通气功能下降,以阻塞性为主,我们在教桌前定点采集空气中SiO_2浓度,其几何均数为0.6～2.3mg
We conducted this work for three years since 1981, and as a result, ① we found 1 case of pneumoconiosis caused by teachers who inhaled chalk powder for a long period of time. The X-ray showed mainly due to interstitial fibrosis caused by the fine mesh and dense small round shadows, the density of light, the edge is unclear, the size of 1.5mm below the lungs to the middle and lower back as the lung function For the B class. ② long-term inhalation of chalk dust can make pulmonary ventilation decreased, mainly obstructive, we fixed point in front of the teaching desk to collect air SiO 2 concentration, the geometric mean of 0.6 ~ 2.3mg