68. Non-ionizing radiation in the workplace – extremely low frequency radiation and static fields.

What is the frequency range of Extremely Low Frequency (ELF) radiation?

Up to 300 Hz.

What is the wavelength of ELF radiation?

Greater than 1000 km.

What are static fields?

Static magnetic and electric fields have a frequency of 0 Hz and are characterized by unchanging field strengths.

What are natural sources of ELF and static fields?

The Earth, due to electric currents in its core.

What are man-made sources of ELF and static fields?

Power transmission lines and large magnets (e.g., in MRI machines or industrial equipment).

What do the health effects of ELF radiation depend on?

Whether the radiation is from the electric or magnetic component.

What are health effects of static magnetic fields?

Visual disturbances and biochemical effects at the cellular level.

What are general protection methods against ELF and static fields?

Grounding conductive objects, shielding, maximizing distance, minimizing time of exposure.

Why should metal objects be kept away from strong static magnetic fields?

To prevent attraction and potential injury due to sudden movement toward the magnetic source.