In flame effects safety, what term describes the radiant energy reaching a person's exposed skin?

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The main idea is the specific naming of radiant energy as it lands on a surface. When radiant energy from a flame reaches a person’s exposed skin, that energy at the surface is called incident radiation. It describes the amount and intensity of radiant energy arriving per unit area (often expressed as irradiance, in W/m^2), focusing on what actually strikes the skin rather than what is emitted by the flame or what happens after it enters the body.

Radiant flux would be the total radiant power crossing a surface (in watts), which is about the overall amount of energy moving across a surface, not the specific energy arriving on the skin per area. Thermal load refers to the overall heat exposure over time, including duration and absorption, not just the immediate incident energy. Heat transfer is the broader process that includes conduction, convection, and radiation, not the specific term for energy landing on the skin. Therefore, incident radiation best describes the radiant energy reaching exposed skin.