Health physics
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The three dimensional impedance method has been used to calculate the distribution of induced current densities in a simple model of an 8-y-old child exposed to the electric and magnetic fields of an electric blanket. Two types of electric blankets have been modeled in the calculations, the pre-1989 conventional type and the presently available low magnetic field PTC (positive temperature coefficient) electric blanket. ⋯ However, the computations have also shown that the contribution to the total current density by the electric field of the low magnetic field electric blanket is slightly higher than that due to the electric field of the conventional electric blanket. Hence, the total average induced current density due to both the electric and magnetic fields in the case of the low magnetic field PTC electric blanket is about one-third that in the case of the conventional electric blanket.