Authors: I.Liorni, M. Parazzini , S. Fiocchi & P. Ravazzani
Source: FERMAT, Volume 9, Communications 5, May Jun., 2015
Abstract: The modelling of human exposure in realistic exposure scenarios is complex, because several parameters (e.g., the source design, the frequency band, the orientation of incident fields, the morphology and posture of subjects) vary and influence the dose. Deterministic dosimetry, so far used to quantify human exposure to electromagnetic fields (EMF), is highly time consuming if the variations of those parameters are considered. Stochastic dosimetry is an alternative approach to assess EMF exposure and consists in building analytical approximations of the exposure at a parsimonious computational cost. In this study, it was used to assess the influence of magnetic flux density (B) orientation on fetal exposure at 50 Hz using the polynomial chaos (PC) theory. A PC expansion of induced electric field (E) in each fetal tissue at 7 months of gestational age (GA) was built as a function of B orientation. Maximum E in each fetal tissue was estimated for different exposure configurations and compared with the limits of the International Commission of NonIonising Radiation Protection (ICNIRP) Guidelines 2010. PC theory resulted in an efficient method to build accurate approximations of E in each fetal tissue. B orientation influenced E with a variability across tissues in the range from 10% to 25% with respect to the mean value. However, varying B orientation, maximum E in each fetal tissue was below the limits of ICNIRP 2010.
Keywords: fetus; ELF-MF exposure; stochastic dosimetry; polynomial chaos
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Study of the influence of the magnetic field orientation using Polynomial Chaos decomposition applied to the pregnant woman exposure at 50 Hz