Small integrating meter for assessing long-term exposure to magnetic fields.

Area of Science:

• Biophysics
• Occupational Health
• Electromagnetic Field Measurement

Background:

• Accurate magnetic field exposure assessment is crucial for occupational health studies.
• Existing magnetic field meters may lack portability or comprehensive measurement capabilities.

Purpose of the Study:

• To introduce and evaluate the AMEX-3D, a novel, lightweight meter for measuring magnetic flux density.
• To assess the cumulative exposure to root-mean-square (rms) resultant magnetic flux density.

Main Methods:

• The AMEX-3D continuously measures magnetic flux density along three axes.
• It electronically combines data into a single cumulative exposure estimate.
• The instrument features a flat frequency response (30-1,000 Hz) and a dynamic range of 0.02-15 microT.

Main Results:

• The AMEX-3D is small (2.7 cm x 5.1 cm x 10.2 cm), lightweight (120 g), and battery-powered.
• Estimated accuracy is +/- 20% across its dynamic range.
• Field testing with electric-utility linemen demonstrated excellent agreement between AMEX-3D and EMDEX meters.

Conclusions:

• The AMEX-3D is a viable and accurate tool for magnetic field exposure assessment.
• Its portability and ease of use make it suitable for field studies in occupational settings.
• The instrument provides reliable data for evaluating worker exposure to magnetic fields.