Review date
4 June 2024
Article publication date
6 May 2024
Summary
This study conducted computer simulations comparing the specific absorption rate (SAR) of radiofrequency electromagnetic energy (RF-EME) at the male reproductive system from different mobile telecommunication frequencies. The study explored frequencies between 0.69 GHz and 4.9 GHz. The primary benefit of computing SAR instead of considering incident power density (Sinc) is that it allows for more accurate comparison between exposures from electromagnetic fields of different frequencies. The study also performed calculations for exposure scenarios in three postures (standing, sitting and sleeping).
While maintaining an equal level of exposure across frequencies, the calculations showed that a higher frequency resulted in lower SAR at the reproductive system. Both a sitting and sleeping posture resulted in less exposure than a standing posture. When calculations were repeated for incident power densities at the exposure limits prescribed in the Institute of Electrical and Electronics Engineers (IEEE) guidelines the corresponding SAR values for each frequency band were highest at 2.2 GHz and decreased at higher or lower frequency bands. The same relationship between dose and posture was observed for exposures at the limit.
Link to
Absorption of 5G sub-6 GHz electromagnetic radiation from base station to male reproduction system
Published in
International Journal of Radiation Biology
ARPANSA commentary
There is a growing volume of longitudinal studies (e.g. Ramirez-Vazquez et al., 2023; Markussen et al., 2022; Iakovidis et al., 2022), including those published by ARPANSA (Bhatt et al., 2024), showing that public exposures to RF-EME have remained largely the same throughout the introduction of new communication technologies despite an overwhelming increase in the total usage of wireless telecommunication infrastructure by the public. The conclusions of this study provide similar reassurance by indicating that exposures to higher frequency RF-EME, like those used in newer communication technologies, contribute less SAR than an equivalent exposure from a lower frequency band.
The calculations at exposure limits in this study were performed according to exposure limit guidance prepared by the IEEE. These guidelines, while similar to those in the Australian standard RPS-S1, are slightly less restrictive. The Australian standard is based on guidelines by the International Commission on Non-Ionizing Radiation Protection (ICNIRP), which are considered international best practice. More information on these differences can be found in a previous radiation literature survey. Notably, the study demonstrated the suitability of using power density limits (termed reference levels) which are easier to quantify for complying with SAR limits (termed basic restrictions) which are more difficult to quantify.
