Which type of radiation may produce erythema that lasts up to about one hour?

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Multiple Choice

Which type of radiation may produce erythema that lasts up to about one hour?

Explanation:
Infrared radiation. It heats the skin and causes superficial blood vessels to dilate, producing a transient redness. This erythema is short-lived because once the heat dissipates, the vessels constrict back toward normal, so the redness typically fades within about an hour. Ultraviolet can also cause erythema, but its onset and duration are dose-dependent and can last longer than an hour; minimal erythema is a UV-dose threshold concept, not the short-lived reaction described here; other terms like second-degree erythema aren’t standard for this context.

Infrared radiation. It heats the skin and causes superficial blood vessels to dilate, producing a transient redness. This erythema is short-lived because once the heat dissipates, the vessels constrict back toward normal, so the redness typically fades within about an hour. Ultraviolet can also cause erythema, but its onset and duration are dose-dependent and can last longer than an hour; minimal erythema is a UV-dose threshold concept, not the short-lived reaction described here; other terms like second-degree erythema aren’t standard for this context.

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