Subject: APPLIANCES re magnetic fields....Austria....4 08ASSESSMENT OF INHOMOGENEOUS ELF MAGNETIC FIELD EXPOSURES.
Institute of Health Care Engineering, European Notified Body of Medical Devices, Graz University of Technology, Inffeldgasse 18, A-8010 Graz, Austria.
In daily life as well as at workplaces, exposures to inhomogeneous magnetic fields become very frequent. This makes easily applicable compliance assessment methods increasingly important. Reference levels have been defined linking basic restrictions to levels of homogeneous fields at worst-case exposure conditions. If reference levels are met, compliance with basic restrictions can be assumed. If not, further investigations could still prove compliance. Because of the lower induction efficiency, inhomogeneous magnetic fields such as from electric appliances could be allowed exceeding reference levels. To easily assess inhomogeneous magnetic fields, a quick and flexible multi-step assessment procedure is proposed. On the basis of simulations with numerical, anatomical human models reference factors were calculated elevating reference levels to link hot-spot values measured at source surfaces to basic limits and allowing accounting for different source distance, size, orientation and position. Compliance rules are proposed minimising assessment efforts. [ emphasis added by jcm....]
PMID: 18407972 [PubMed - as supplied by publisher]
Related Articles
- Electric emissions from electrical appliances. [Radiat Prot Dosimetry. 2008]
- Evaluation of nonuniform 60-hertz magnetic-field exposures for compliance with guidelines. [J Occup Environ Hyg. 2004]
- Finite volume analysis of temperature effects induced by active MRI implants: 2. Defects on active MRI implants causing hot spots. [Biomed Eng Online. 2006]
- Dosimetric assessment of simultaneous exposure to elf electric and magnetic fields. [IEEE Trans Biomed Eng. 2008]
- Assessment of multiple frequency ELF electric and magnetic field exposure. [Phys Med Biol. 2008] See all Related Articles...
[ 9-07-08 jcm file notes - DEFINITIONS:
Noun 1. inhomogeneity - the quality of being inhomogeneous unregularity, irregularity - not characterized by a fixed principle or rate; at irregular intervals
Adj. 1. homogenous - all of the same or similar kind or nature; "a close-knit homogeneous group" undiversified - not diversifieduniform, unvarying - always the same; showing a single form or character in all occurrences; "a street of uniform tall white buildings"same - closely similar or comparable in kind or quality or quantity or degree; "curtains the same color as the walls"; "two girls of the same age"; "mother and son have the same blue eyes"; "animals of the same species"; "the same rules as before"; "two boxes having the same dimensions"; "the same day next year" .......... ]