What is the primary factor in determining how well the body will absorb EMF?

What is the primary factor in determining how well the body will absorb EMF?

• A. Shielding
• B. Distance
• C. Intensity
• D. Frequency of the emitter

Answer: (D)

How the body takes up EMF energy depends mainly on how the wave interacts with biological tissue, which changes with frequency. Tissue properties like permittivity and conductivity vary across frequencies, so the rate at which energy is absorbed per unit mass (SAR) shifts as frequency changes. This means energy at different frequencies can be deposited in different amounts and at different depths: some frequencies penetrate deeper while others deposit most of their energy near the surface. The factors of shielding, distance, and how strong the source is will influence how much energy reaches the body, but the intrinsic absorption behavior—the likelihood of energy being absorbed and converted to heat—is governed primarily by the frequency of the EMF.

How the body takes up EMF energy depends mainly on how the wave interacts with biological tissue, which changes with frequency. Tissue properties like permittivity and conductivity vary across frequencies, so the rate at which energy is absorbed per unit mass (SAR) shifts as frequency changes. This means energy at different frequencies can be deposited in different amounts and at different depths: some frequencies penetrate deeper while others deposit most of their energy near the surface. The factors of shielding, distance, and how strong the source is will influence how much energy reaches the body, but the intrinsic absorption behavior—the likelihood of energy being absorbed and converted to heat—is governed primarily by the frequency of the EMF.