Assessment of the Cumulative Exposure of Children to Electromagnetic Fields
01 / 2008 - onbekend
The main goals of this project are:· the development of an exposure matrix· to develop advanced numerical models of children of different age groups whose posture can be modified· experimental evaluation of the most relevant sources and generation of appropriate numerical models · to numerically quantify the actual exposure of the children in the anatomical models for typical usage patterns and worst-case situations considering whole body as well as local and organ specific exposure with particular focus on the different regions of the brain for the following types of exposure: a) in the immediate near-field of ELF devices, such as induction cook tops b) in the near-field of stationary RF devices, such as systems for electronic article surveillance or electronic access control, and portable (body mounted and handheld) devices operating in the GHz range, such as mobile phones with hands-free kits or PDAs with wireless links c) in the further near-field and the far-field of devices operating in the GHz range such as mobile phones, laptop computers with WLAN or UMTS, etc.· to validate the incident fields caused by these devices in the respective frequency ranged using state-of-the-art experimental means· to numerically quantify the worst case temperature rise in the children for the exposure situations listed above· to assess the uncertainty of the induced currents and the SAR and temperature distributions with respect to the applied dielectric and thermal parameters. This projects aims at the assessment of the exposure of children to electromagnetic frequencies in daily environments. The frequency range of the considered electromagnetic field sources ranges from ELF to GHz. The coupling mechanisms from the extreme near-field to the far-field must therefore be characterized. Numerical whole body models of children of different age groups will be developed and improved such that their limbs can be moved and their body posture can be changed, and induced currents and SAR and temperature elevations will be evaluated using different numerical and experimental methods. The overall uncertainty of the results determined from measurements, numerical modeling and the dielectric and thermal tissue parameters will be assessed and the impact of the results on the currently applied exposure limits will be analyzed. This encompasses: · literature review to define a exposure matrix· development of numerical models of children of different age groups whose posture can be changed while maintaining the integrity of their organs and tissue structure;· characterization of the coupling mechanisms of the most relevant EM sources (electronic article surveillance, induction cooking appliances, power lines, transformers, body-worn wireless networks, etc.) into the bodies of children;· evaluation of daily and worst-case exposure conditions with respect to current density, SAR and the induced thermal load for the most important EM sources· determination of the overall uncertainty of the findings with respect to anatomy, tissue parameters, source characteristics, etc.· providing review committees with the appropriate weight of scientific evidence of the correlation of electromagnetic field exposure and the field induced to children· detection of potential gaps in current standards for the testing of compliance with safety limits of EM fields· provision of the scientific basis for the development of suitable recommendations for the reduction of individual exposure· experimental characterization of the most relevant sources and generation of appropriate numerical models.