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Quantification of harmful UV LED radiation at workplaces

Gabriel Hopfenmüller , Niklas Papathanasiou, Tilman Weiss. Quantification of harmful UV LED radiation at workplaces. Content UV radiation hazards ICNIRP action spectrum A ctinic radiometer and actinic spectroradiometer Indicators for actinic radiometers and spectroradiometers

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Quantification of harmful UV LED radiation at workplaces

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  1. Gabriel Hopfenmüller, Niklas Papathanasiou, Tilman Weiss Quantification of harmful UV LED radiation at workplaces

  2. Content • UV radiation hazards • ICNIRP action spectrum • Actinic radiometer and actinic spectroradiometer • Indicatorsforactinicradiometersandspectroradiometers • Conclusionsforselectedapplications

  3. UV radiationeffects on the human eye • Conjunctivitisburnoftheconjunctiva • (Bindehautentzündung) TROS IOS - Technische Regeln zur Arbeits- schutzverordnung zu künstlicher optischer Strahlung

  4. UV radiationeffects on the human skin CIE erythemaactionspectrum • Due tomentionedrisks, employersareobligatedtoprepare a hazardassessmentfortheir UV emittingsystems.

  5. ICNIRP* guideline (UV 180 to 400nm): • Ultraviolet radiant exposure in the region 180 to 400nmof • the eyes and skin must not exceed 30Jm-2 effective • spectrally weighted per day. • *ICNIRP - International Commission on Non-Ionizing Radiation Protection

  6. Atemissionbetween 315 and 400nman additional UVA assessmentisnecessary: dangerforeyelens, unweighted, max. 104 Jm-2 per day Between 300 and 700nm additional assessments on blue light hazardarenecessary (photochemicaleffects on retina)

  7. Exactweighting per nmaccordingtotheactionspectrum • Calibrationisindependentfromsource • Spectroradiometer • Integrating • actinic radiometer • First “weighting“ isdonebythesensor/filter spectral responsivity (Rsensor) • Calibration depending on measuredsource– kSourcecorrectionofthe spectral mismatchbetweenRSensorandtheactionspectrum S

  8. Quality indicatorsofactinicradiometers (irradiance) accordingtoDIN 5031-11:2011-04 • Calibrationuncertainty • Adaption to the spectral weighting function • Sensitivity to radiation under and above the range of the action spectrum • Cosine response • Signal sensitivity to rotation around the optical axis • Linearity • Fatigue – decrease of the signal at constant conditions (reversible) • Temperature coefficient within the relevant temperature range • Influences of modulation and polarisation • Homogeneity of the detector entrance optics

  9. UVC disinfection • Assessment accordingtoICNIRP (180-400nm) • Actinicradiometricmeasurementissufficient • Conclusionsforselectedapplications

  10. UVCuring • 365nm • Assessment accordingto ICNIRP 180-400nm withactinicradiometer • Absolute UVA measurementwithradiometer • Bluelighthazardmeasurement - depending on sourcedimension - themeasureisactinicirradianceoractinicradiance • 395nm • Absolute UVA measurementwithradiometer • Bluelighthazardmeasurement - depending on sourcedimension - themeasureisactinicirradianceoractinicradiance. • Conclusionsforselectedapplications

  11. UV in horticulture • Assessment accordingtoICNIRP (180nm-400nm) • Absolute UVA measurement • Bluelighthazardmeasurement - actinicradiance • Due to optional tuningandvaryingagingbehaviorofthe different LED wavelengthsandpossibleinhomogeneities, a spectradiometricassessmentisnecessary Assumingtheuseoftwo UV LEDs • Conclusionsforselectedapplications Tuned – relative change

  12. Documentationofriskassessment must contain • Kind, heightand time ofexposure • Measurement methods, sourceinformations • Wavelengthrange • Comparisonwithlimitsaccordingto 2006/25/EU • Impacts on safetywithoutprotection Employee/userstraining Frequently Explanation ofrisks, limits, assessmentresults Description ofsafeprocedures, useofprotectionequipment

  13. Thankyouforyourattention! • References: • Directive 2006/25/EC ofthe European Parliamentandofthe Council of 5 April 2006 on theminimumhealthandsafetyrequirementsregardingtheexposureofworkerstorisksarisingfromphysicalagents (artificialopticalradiation) • ICNIRP GUIDELINES On limitsofexposuretoultravioletradiationofwavelengthsbetween 180nm and 400nm (incoherentopticalradiation) • DIN 5031-11:2011-04 - Optical radiationphysicsandilluminatingengineering - Part 11: Radiometer formeasuringactinicradiantquantities - Terms, characteristicsandtheirclassification • Bundesamt für Arbeitsschutz und Arbeitsmedizin – Bericht, Photobiologische Sicherheit von Licht emittierenden Dioden (LED) • TROS IOS - Technische Regeln zur Arbeitsschutzverordnung zu künstlicher optischer Strahlung, Bundesministerium für Arbeit und Soziales

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