Electromagnetic Field (EMF) Assessments

What Are Electromagnetic Fields (EMFs)?

Electromagnetic fields are produced by electrically charged particles in motion. They are a form of non-ionising radiation that travels through the air and some solid materials. EMFs cover a wide range of frequencies, from low-frequency power lines to higher-frequency radio waves and microwaves.

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In the workplace, EMFs can come from equipment such as welding units, induction heaters, medical imaging devices, and high-voltage power systems. Unlike ionising radiation (such as X-rays), EMFs do not have enough energy to remove electrons from atoms, but prolonged exposure can still cause biological effects, particularly heating of body tissue and potential interference with implanted medical devices.

Why Is EMF Assessment Important?

Although EMFs are non-ionising, long-term or high-intensity exposure can affect health. Known effects include:

• Thermal effects – tissue heating caused by high-frequency fields (e.g., radiofrequency and microwave sources).

• Stimulation effects – nerve and muscle stimulation from low-frequency fields, which may cause discomfort or tingling.

• Interference with medical devices – pacemakers, hearing aids, and other implants can be affected by strong EMFs.

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An EMF assessment identifies sources, measures exposure levels, and determines whether they are within recommended limits, protecting workers and ensuring compliance with regulations such as the Control of Electromagnetic Fields at Work Regulations 2016.

How Is EMF Exposure Assessed?

An EMF assessment typically involves:

1. Identifying sources – locating equipment that generates EMFs, such as motors, transformers, or radiofrequency devices.

2. Measuring field strength – using calibrated instruments to measure electric field strength (V/m), magnetic field strength (A/m), or power density (W/m²), depending on the frequency range.

3. Comparing results to exposure limits – assessing measurements against occupational exposure guidelines.

4. Evaluating work patterns – considering how long workers are exposed and whether controls are effective.
    

Where exposure levels approach or exceed guidance values, controls such as shielding, limiting time near sources, or restricting access to high-field areas are recommended

Why Choose Us for EMF Assessments?

At Workplace Scientifics, we use reliable measurement techniques and follow recognised occupational hygiene methods to assess EMF risks in your workplace. Our reports are clear, practical, and focused on protecting your team while keeping you compliant with HSE guidance. We also provide tailored advice on reducing exposure, from simple procedural changes to engineering controls.