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Table 3 Exposure level to dust by raw materials – the Iksan Precious Metal Complex Jewelry Processing Company (1999)

From: Systemic sclerosis due to crystalline silica exposure among jewelry workers in Korea: two case reports

  Crystal Non-Crystal
  No. of Personal Samples Exposure Level (mg/m3) No. of Personal Samples Exposure Level (mg/m3)
Total Dust 11 0.642 (0.267–1.841) 38 0.254 (0.045–0.675)
Respirable dust 9 0.219 (0.101–0.388) 18 0.108 (0.010–0.281)
Crystalline silica 9 0.025 (NDa - 0.082) 18 ND
  1. ND not detected
  2. aThe two workers mainly processed cubic zirconia, ruby, sapphires, and sometimes amethyst