Precautions should be taken to avoid the radioactive dust produced when grinding

• A. Nickel-based electrodes
• B. Copperclad electrodes
• C. Thoriated tungsten electrodes
• D. Carbon electrodes

Answer: (C)

Grinding thoriated tungsten electrodes releases radioactive dust because thorium is present to improve emission. That means inhaling or skin-contaminating particles poses a real health risk, so controls focus on preventing airborne dust and limiting exposure. Use engineering controls like local exhaust ventilation or grinding in a well-ventilated area, and keep dust down with damp grinding or a water spray and a grinder equipped with effective dust collection. Always wear a suitable respirator (such as a HEPA or P100 cartridge), eye protection, and protective clothing, and manage the waste and any contaminated tools as radioactive material according to regulations. If possible, choose non-radioactive tungsten electrode types to avoid this hazard altogether.