Protecting Workers from Ultraviolet Radiation - icnirp

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10.2.2 Use of interlocks Protecting Workers from Ultraviolet Radiation Where direct access to the source is required, for example for maintenance, fail-safe interlocks manufactured, installed, tested and used to agreed relevant technical standards, should be used (Figure 8). Figure 8. Example of an interlock switch on the door of a LumalierTM ultraviolet germicidal irradiation system. When the door to the system is open (upper left insert), the power to the UV lamps is off prohibiting exposure to UVR. When the door is closed (as simulated on the right), the UV lamps are on. 10.2.3 Elimination of reflected UVR Many surfaces, especially those that are visibly shiny, are often good reflectors of UVR. To reduce the intensity of reflected radiation, surfaces can be coated or painted with appropriate non-UVR reflective material. 10.2.4 Ventilation and mechanical hazards Ventilation may be needed to safely exhaust ozone produced by UVC. Threshold limit values (TLVs) for controlling occupational exposure to ozone expressed in terms of time-weightedaverage concentrations for an 8 hour working day are published by the American Conference of Governmental Industrial Hygienists (ACGIH 2004). If the pressure within a source is significantly different from atmospheric pressure, consideration should also be given to the risk of explosion/implosion. 66
10.3 Administrative Control Measures 10.3.1 Training Protecting Workers from Ultraviolet Radiation People working with a UVR source or maintaining such a source should be provided with adequate training to understand the need for control of the hazards involved and to carry out their work safely. 10.3.2 Limitation of access Access to an indoor work area where hazardous levels of UVR exist should be restricted to those informed of the potential hazards and trained in appropriate protective measures. Reducing the time of exposure and increasing the distance of a worker from the source can be used as effective control measures. The exposure duration should be kept to a minimum, and if a source is not enclosed, the user should keep as far away from the source as is practicable. 10.3.3 Hazard warnings and signs Hazard warning signs should be used to indicate the presence of a potential UVR hazard when exposures are likely to exceed recommended exposure limits and indicate restriction of access, as illustrated in Figure 9, and if appropriate the need for personal protection. Warning lights may also be used to show when the equipment is energized. Figure 9. Typical signs used in the work environment to advise of hazards and recommend the use of personal protective equipment 10.4 Personal protection Where, because of the nature of the work, for example the need to carry out a task close to a source, and neither engineering nor administrative controls are practical, personal protection is required. 67
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Protecting Workers from Ultraviolet
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International Commission on Non-Ion
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PREFACE The objective of this book
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1. Introduction Protecting Workers
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Page 43 and 44: 7.4 CIE Risk Groups for Lamps Prote
Page 47 and 48: 8.3.4 Personal dosimeters Protectin
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Page 71 and 72: APPENDIX A RADIOMETRIC TERMS AND UN
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Page 89 and 90: APPENDIX E Protecting Workers from
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Page 102 and 103: REFERENCES Part II: Additional Refe
Page 110: ISBN 978-3-934994-07-2
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Protecting Workers from Ultraviolet Radiation - icnirp

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