热电厂工人接尘剂量与尘肺发病关系的探讨

为研究热电厂接尘工人接尘剂量与尘肺发病的关系，根据某热电厂接尘工人接尘时间、肺总通气量及车间的粉尘浓度和游离ＳｉＯ２含量，计算职工肺内石英负荷量，然后采用累积剂量患病率寿命表法研究尘肺患病率与粉尘剂量反应关系，推算该类粉尘的容许浓度。结果：接尘剂量与尘肺患病率呈显著正相关关系（ｒ＝０．９２３，Ｐ＜０．００５），并推算出其直线回归方程为Ｙ＝－４５．４０４４＋１１．０１０１２Ｘ。提示：如果要求每人平均工作３０ａ，且尘肺患病率低于０５％，则接触煤粉（ｃｏａｌｄｕｓｔ）者和接触灰粉（ｆｌｙａｓｈ）者作业场所平均粉尘浓度分别应控制在１０００ｍｇ／ｍ３和３２５ｍｇ／ｍ３以下。

TX Relation between the dust exposure and morbidity of pneumoconiosis in thermoelectric power plants

In order to study the relation between dust exposure and morbidity of pneumoconiosis in the coal fired power plants,on the basis of the exposure time to dust,total pulmonary ventilation capacity,dust concentration and free silica content,the quartz loading dose in the lungs of dust exposured workers,was determined in a thermoelectric power plant and the dose response relation between the dust and the morbidity rate of pneumoconiosis was analysed with the life table of dose cumulative morbidity. The results showed that there was a positive correlation between the dust dose and the morbidity rate( r=0.923,P <0.005).The linear regression equation is Y =-45.4044 11.0102 X .It is suggested that if every worker be expected to work for 30 years and the cumulative morbidity to be lower than 0 5%,the mean concentration of dust in the air for coal dust exposurer and fly ash exposurer must be reduced to under 10.00 and 3.25 mg/m 3, respectively.