Mapping of static magnetic fields near the surface of mobile phones

Abstract

Overview

The use of mobile phones and the potential health risks associated with their emitted electromagnetic fields, particularly static magnetic fields (SMF), are controversial and demand further study. Although there is extensive engagement with radiofrequency (RF) fields, SMF scrutiny is less prevalent.

Findings

• We conducted two-dimensional mappings of SMF on mobile phones using a tri-axis magnetometer to assess exposure levels.
• The SMF at varying distances from phone screens of five different models was mapped, and a mathematical model was created to extrapolate these measurements.
• Exposure estimations, placed in the microtesla to millitesla range, are especially significant considering the proximity of mobile phones to sensitive head tissues including the brain and inner ear.

Implications and Conclusion

Magnetic fields, despite being below the current exposure limits set by regulatory bodies, have shown biological effects such as the promotion of reactive oxygen species (ROS) production. This highlights the need for continuous research into the complex interactions of combined electromagnetic fields (SMF, RF, and ELF) and their biological implications. Moreover, our findings suggest exploring technological innovations like replacing electrodynamic loudspeakers and microphones to potentially reduce SMF exposure from mobile phones.