Volume 4, 2020

Environmental Pollution


Elisaveta Petrova

Pages: 118-120

DOI: 10.21175/RadProc.2020.25

The aim of the study was to predict the occurrence of silicosis and asbestosis, resp. from dry or from dry and water drilling in the mines among former miners, and among asbestos exposed workers by determining the duration of dust free period [DFP] – for silicosis, and latent period [LP] – for asbestosis, and to describe some new trends of appearance of early silicotic changes during water drilling in the Bulgarian mines. DFP was investigated among 481 quartz exposed miners, and the LP – among 120 asbestos exposed workers. A retrospective and cross-sectional study, using linear regression analysis for DFP, respectively nonparametric analysis – for mean of LP has been performed. SPSS software package has been used. The DFP has been calculated, using the formula: У= А + Х1.В + Х2.С + Х3.D + Х4.Е, where the regression coefficients were: A (free coefficient), B (age), C (dust exposure duration), D (total dust concentrations), and E (quartz presence in the dust). The coefficients have been of different values for each mine. The average LP up to the occurrence of benign asbestos diseases was about 17.45 years. Conclusions: Calculation of DFP and LP values, together with the knowledge of the number of exposed workers and their exposure makes possible to predict the occurrence of silicosis and benign asbestos diseases in future.
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Elisaveta Petrova, "Appearance of silicosis and asbestosis in dust exposed workers," RAD Conf. Proc, vol. 4, 2020, pp. 118–120, http://doi.org/10.21175/RadProc.2020.25