Skin temperature increase caused by a mobile phone: a methodological infrared camera study.

Area of Science:

• Biophysics
• Electromagnetics
• Human Health

Background:

• Mobile phone users report ear region heating and burning sensations.
• Potential causes include thermal insulation, electrical power dissipation, and radio frequency (RF) exposure.
• Quantifying the contribution of each factor to skin temperature increase is crucial.

Purpose of the Study:

• To investigate the individual contributions of thermal insulation, electrical power dissipation, and RF exposure to skin temperature changes during mobile phone use.
• To utilize infrared (IR) camera techniques for precise temperature measurements.
• To analyze the effects at different power levels of a GSM 900 phone.

Main Methods:

• A double-blind experiment was conducted on a single healthy male subject.
• Infrared (IR) thermography was used to measure skin temperature changes.
• Measurements were taken after 15 and 30 minutes under three conditions: phone off (control), phone on with antenna replaced by a load (eliminating RF), and phone transmitting RF fields at minimal and maximal power levels.
• Temperature changes were calculated relative to the unexposed side of the head.

Main Results:

• Both thermal insulation and electrical power dissipation resulted in statistically significant increases in skin temperature.
• Radio frequency (RF) exposure did not lead to a statistically significant rise in skin temperature.
• The observed temperature increases were measured on the ear region of the head.

Conclusions:

• Thermal insulation and electrical power dissipation are the primary contributors to mobile phone-induced ear heating.
• RF exposure from the studied GSM 900 phone does not significantly elevate skin temperature.
• Further research may explore different phone models and usage patterns.