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Comparison of Thermal Response for RF Exposure in Human and Rat Models

Author

Listed:
  • Sachiko Kodera

    (Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan)

  • Akimasa Hirata

    (Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan)

Abstract

In the international guidelines/standards for human protection against electromagnetic fields, the specific absorption rate (SAR) is used as a metric for radio-frequency field exposure. For radio-frequency near-field exposure, the peak value of the SAR averaged over 10 g of tissue is treated as a surrogate of the local temperature elevation for frequencies up to 3–10 GHz. The limit of 10-g SAR is derived by extrapolating the thermal damage in animal experiments. However, no reports discussed the difference between the time constant of temperature elevation in small animals and humans for local exposure. This study computationally estimated the thermal time constants of temperature elevation in human head and rat models exposed to dipole antennas at 3–10 GHz. The peak temperature elevation in the human brain was lower than that in the rat model, mainly because of difference in depth from the scalp. Consequently, the thermal time constant of the rat brain was smaller than that of the human brain. Additionally, the thermal time constant in human skin decreased with increasing frequency, which was mainly characterized by the effective SAR volume, whereas it was almost frequency-independent in the human brain. These findings should be helpful for extrapolating animal studies to humans.

Suggested Citation

  • Sachiko Kodera & Akimasa Hirata, 2018. "Comparison of Thermal Response for RF Exposure in Human and Rat Models," IJERPH, MDPI, vol. 15(10), pages 1-17, October.
    • Handle: RePEc:gam:jijerp:v:15:y:2018:i:10:p:2320-:d:177453
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    References listed on IDEAS

    as
    1. Sachiko Kodera & Jose Gomez-Tames & Akimasa Hirata & Hiroshi Masuda & Takuji Arima & Soichi Watanabe, 2017. "Multiphysics and Thermal Response Models to Improve Accuracy of Local Temperature Estimation in Rat Cortex under Microwave Exposure," IJERPH, MDPI, vol. 14(4), pages 1-17, March.
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    Cited by:

    1. Maria Rosaria Scarfì & Mats-Olof Mattsson & Myrtill Simkó & Olga Zeni, 2019. "Special Issue: “Electric, Magnetic, and Electromagnetic Fields in Biology and Medicine: From Mechanisms to Biomedical Applications”," IJERPH, MDPI, vol. 16(22), pages 1-3, November.

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