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Quantification of Harmful UV LED Radiation at Workplaces

This study examines the hazards of UV radiation on human eye and skin at workplaces, including the effects of UVA and blue light exposure. With a focus on ICNIRP guidelines and employing actinic radiometers, the research provides insights into the calibration and quality indicators of UV measurement devices. Recommendations for UV in horticulture, UVC disinfection, and UVC curing are discussed. The documentation requirements for risk assessment and employee training are outlined, following European directives and industry standards.

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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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