Significant RF-EMF and thermal levels observed in a computational model of a person with a tibial plate for grounded 40MHz exposure

• Published in: Bioelectromagnetics Vol. 35; no. 4; p. 284
• Main Authors: McIntosh, Robert L, Iskra, Steve, Anderson, Vitas
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc 01.05.2014
• ISSN: 0197-8462; 1521-186X
• DOI: 10.1002/bem.21846

Using numerical modeling, a worst-case scenario is considered when a person with a metallic implant is exposed to a radiofrequency (RF) electromagnetic field (EMF). An adult male standing on a conductive ground plane was exposed to a 40MHz vertically polarized plane wave field, close to whole-body resonance where maximal induced current flows are expected in the legs. A metal plate (50-300mm long) was attached to the tibia in the left leg. The findings from this study re-emphasize the need to ensure compliance with limb current reference levels for exposures near whole-body resonance, and not just rely on compliance with ambient electric (E) and magnetic (H) field reference levels. Moreover, we emphasize this recommendation for someone with a tibial plate, as failure to comply may result in significant tissue damage (increases in the localized temperature of 5-10°C were suggested by the modeling for an incident E-field of 61.4V/m root mean square (rms)). It was determined that the occupational reference level for limb current (100mArms), as stipulated in the 1998 guidelines of the International Commission on Non-Ionizing Radiation Protection (ICNIRP), is satisfied if the plane wave incident E-field levels are no more than 29.8V/mrms without an implant and 23.4V/mrms for the model with a 300mm implant. Bioelectromagnetics. 35:284-295, 2014. © 2014 Wiley Periodicals, Inc. [PUBLICATION ABSTRACT]