Computational simulations of the penetration of 0.30 THz radiation into the human ear

Abstract

Overview

This study explores the use of 0.30 terahertz (THz) radiation, increasingly used in industrial and security applications, and its ability to penetrate human soft tissue, particularly focusing on its implications for ear health.

Findings

• Soft tissue shows a high absorption coefficient at 0.30 THz, limiting radiation penetration to 0.2 - 0.4 mm depth.
• The study used simulations to analyze how 0.30 THz radiation could diffuse through the ear canal, estimating potential exposure of the tympanic membrane (ear drum).
• With excitation aligned parallel to the ear canal, power flux density within the central region of the tympanic membrane was found to be 97% of the incident radiation.
• Structures of the outer ear provide significant protection, with less than 0.4% of power directed at an angle reaching the tympanic membrane.

Conclusion

The protective capabilities of the outer ear are substantial; however, given the sensitivity of the tympanic membrane to mechanical changes, further in-vivo assessments are essential. These findings are crucial in evaluating the safety limits for 0.30 THz radiation exposure and designing devices that emit such radiation.