Direct biological effects from EMF fields in the 3 GHz to 300 GHz range are absorbed at the skin surface and can cause which conditions?

• A. Electro-stimulatory effects
• B. Thermal effects (deep tissue)
• C. Cataracts
• D. Skin heating effects

Answer: (D)

Direct absorption at millimeter wavelengths happens mainly in the outer layers of the skin, so the primary direct effect is heating of the skin surface. At 3 GHz to 300 GHz, the energy does not penetrate deeply, making deep tissue heating unlikely and reducing the chance of electro-stimulatory effects that require deeper penetration. Cataracts would involve damage to the eye lens, which isn’t the expected outcome when absorption is confined to the skin surface. So the condition most associated with this frequency range is skin heating effects.