RF Safe

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

2019 · Unclear · Insufficient evidence

← Research stream
UnclearInsufficient evidencePaper 1734

Simulations indicated that soft tissue absorption at 0.30 THz limits effective penetration depth to approximately 0.2–0.4 mm. With excitation parallel to the ear canal, the average power flux density within the central tympanic membrane region was 97% of the …

Study snapshot

Publicationmanual · 2019
Study typeexposure_assessment
Reported directionUnclear
Evidence ratingInsufficient

Abstract

Computational simulations of the penetration of 0.30 THz radiation into the human ear Vilagosh Z, Lajevardipour A, Wood A. Computational simulations of the penetration of 0.30 THz radiation into the human ear. Biomed Opt Express. 2019 Feb 28;10(3):1462-1468. doi: 10.1364/BOE.10.001462. Abstract There is an increasing interest in industrial and security applications and the establishment of wireless communication operating at frequencies of up to 0.30 THz. Soft tissue has a high coefficient of absorption at 0.30 THz and this limits effective penetration of the energy to a depth of 0.2 to 0.4 mm. The capacity of 0.30 THz radiation to access the deeper parts of the ear by diffusing through the ear canal and exposing the tympanic membrane (ear drum) to the radiation has not been studied. Simulations show that, with excitation parallel to the ear canal, the average power flux density within the central tympanic membrane region is 97% of the incident excitation. The structures of the outer ear are highly protective; less than 0.4% of the power flux density is directed at 45° from the parallel reached the same region. Given the sensitivity of the tympanic membrane to mechanical change, in-vivo assessment of the penetration of 0.3 THz into the ear canal is warranted to assess the suitability of the present radiation safety limits and to inform 0.3 THz emitting device deign. Open access paper: ncbi.nlm.nih.gov Note: 0.3THz is 300 GHz.

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeexposure_assessment
Effect directionunclear
PopulationHuman ear (computational model/simulations)
Sample sizeNot supplied
ExposuremmWave · 300000 MHz
Evidence strengthInsufficientConfidence: 78% · Peer reviewed: yes

Main findings

Simulations indicated that soft tissue absorption at 0.30 THz limits effective penetration depth to approximately 0.2–0.4 mm. With excitation parallel to the ear canal, the average power flux density within the central tympanic membrane region was 97% of the incident excitation, whereas with excitation directed 45° from parallel, less than 0.4% reached the same region.

Outcomes measured

  • Simulated penetration/absorption depth in soft tissue at 0.30 THz
  • Simulated power flux density reaching the tympanic membrane under different excitation angles

Limitations

  • Computational simulations; no in-vivo measurements reported
  • No health outcomes assessed; study focuses on exposure/penetration metrics
  • Details of model assumptions and boundary conditions not provided in the abstract
View raw extracted JSON
{
  "study_type": "exposure_assessment",
  "exposure": {
    "band": "mmWave",
    "source": "other",
    "frequency_mhz": 300000,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Human ear (computational model/simulations)",
  "sample_size": null,
  "outcomes": [
    "Simulated penetration/absorption depth in soft tissue at 0.30 THz",
    "Simulated power flux density reaching the tympanic membrane under different excitation angles"
  ],
  "main_findings": "Simulations indicated that soft tissue absorption at 0.30 THz limits effective penetration depth to approximately 0.2–0.4 mm. With excitation parallel to the ear canal, the average power flux density within the central tympanic membrane region was 97% of the incident excitation, whereas with excitation directed 45° from parallel, less than 0.4% reached the same region.",
  "effect_direction": "unclear",
  "limitations": [
    "Computational simulations; no in-vivo measurements reported",
    "No health outcomes assessed; study focuses on exposure/penetration metrics",
    "Details of model assumptions and boundary conditions not provided in the abstract"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "0.30 THz",
    "300 GHz",
    "terahertz",
    "mmWave",
    "ear canal",
    "tympanic membrane",
    "power flux density",
    "computational simulation",
    "penetration depth",
    "absorption"
  ],
  "suggested_hubs": [
    {
      "slug": "5g-policy",
      "weight": 0.35,
      "reason": "Discusses relevance of 0.30 THz radiation to wireless communication and radiation safety limits (though not explicitly 5G)."
    }
  ]
}
AI can be wrong. Always verify against the paper.

AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1364/boe.10.001462
PubMed: Not supplied

Read the original paper →

Related papers

← Back to the Research Library