In the ceramics industry, workers are. occupationally exposed to free crystalline silica in many industrial operations. It is well known that ceramics workers have elevated risk of.pneumoconiosis.The prevalence of pneumoconiosis increased with the cumulative exposure (Cavariani et al., 2005). Materials commonly used in the ceramics industry containing a remarkable content of naturally occurring radionuclides. Health effects of exposure to radon progeny other than lung. cancer have been of concern, including other. malignancies and non-malignant respiratorydiseases (Hofmann et al., 2000 and Chen et al.,.2003).