What is the most common source of hazardous IR radiation?

• A. Heated metals
• B. Radiation therapy
• C. Lamps
• D. Furnaces

Answer: (A)

Infrared hazards come from radiant heat emitted by hot surfaces. Any object at elevated temperature emits infrared energy, and the amount increases with temperature. In many workplaces, heated metal surfaces are everywhere—machined parts, rolls, dies, anvils, tools—so workers can be exposed to substantial IR radiation from these hot metals simply by being nearby. This makes heated metals a more frequent and widespread source of hazardous infrared radiation than other options like lamps or medical irradiation equipment. Lamps do emit infrared, but they are often shielded or used in controlled setups, and radiation therapy isn’t a common industrial IR source. Furnaces are indeed strong IR sources, but because hot metal surfaces are so common across many processes, they represent the typical hazard scenario for infrared exposure. To mitigate, keep a safe distance, use shielding, wear heat-resistant barriers, and monitor radiant heat with appropriate instruments.