[en] This guide aims at helping companies to prevent risks related to worker exposure to electromagnetic fields, and at simplifying the assessment approach. After some generalities of electromagnetic fields (notions of electromagnetic spectrum, electric, magnetic and electromagnetic fields, wavelength and frequency, reactive near- or far-field area, work environment), this report describes the effect of an exposure with respect to frequencies (under 100 khz, over 10 MHz, between 100 khz and 10 MHz), recalls the regulation in occupational environment. It presents some generalities on exposure sources, and methods and ways for a simplified risk assessment (equipment inventory and characterization, CE-labelled equipment). It addresses various aspects of a deepened risk assessment: the exposure assessment (emitted field measurement, workstation analysis, maximum exposure, determination of exposure action level or VDA), the indirect effects (contact with a metallic object within the field, projection of ferromagnetic objects, initiation of firing electric devices, fires and explosions), and workers with specific risks (those bearing active implants or passive ferromagnetic implants, pregnant women). The last part addresses actions aimed at reducing the exposure. Eight industrial applications are more particularly addressed and discussed at the end of each chapter: induction-based devices (welding, fusion, heating, surface treatment, so on), magnetizers and demagnetizers, magneto-scopic devices, magnetic resonance imagery devices, electrolytic cells, heating or welding devices based on dielectric losses, and microwave ovens

[en] The contributions to this colloquium on the issues related to optical and electromagnetic radiations on the workplace address various aspects: effects on health and regulation (exposure to artificial optical radiation sources, effects of UV, visible and IR radiations on skin, UV, blue light and phototoxicity, application regulation to prevent risks of exposure to artificial optical radiations, applicable safety standards, retinal toxicity of blue light, industrial electromagnetic radiation sources, assessment of human body exposure to non-ionising electromagnetic fields, transposition of a directive), assessment and prevention (risk assessment without measurement, measurement of non-coherent optical radiations, risk assessment for Led luminaries, preventive and protective means, protection equipment against Led-related risks, organisation of laser-related risk in the CNRS, electromagnetic field measurement and measurement uncertainty, metrology of low-frequency pulsed fields, exposure assessment for EDF workers, an intervention protocol for simplified risk assessment, a simple tool for a first assessment of exposure to electromagnetic fields, medical survey of workers, means of prevention against electromagnetic fields), and case studies (scene spotlights, IR-based radiating drying systems, furnace slags, laser safety in medical environment, magneto-scopy control, high frequency welding press, electric fields measurements and preventive actions in telecommunication systems, exposure due to medical active implants, worker exposure in MRI environment)