ACGIH TLVs for Physical Agents Committee Update .


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ACGIH ® TLVs ® for Physical Agents Committee Update Vice-Chair: Thomas Bernard University of South Florida College of Public Health

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TLV ® Physical Agents Committee Process for Hazardous Agent Selection and Decision Making

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Mission To cultivate, request, gather and assess information on potential wellbeing perils of exposures to physical specialists. Whenever fitting, prescribe ACGIH ® Threshold Limit Values ® for physical specialists.

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2002 PAC Harry Mahar Maurice Bitran Thomas Bernard Gerald Coles Anthony Cullen Daniel Johnson John Leonowich William Murray Bhawani Pathak Robert Patterson Thomas Tenforde Carla Treadwell Consultants: Thomas Adams Thomas Armstrong Gregory Lotz Martin Mainster Gary Myers

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Overview Physical Agents Process Committee Activities TLV ® Development Future Format Agents

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Disclaimer The sentiments communicated here are those of the writer and not of his manager, the Physical Agents Committee or the ACGIH ® Worldwide.

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Physical Agents It\'s the Movement of Energy

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Risk of Health Effects What is the way of the vitality? What amount of vitality? What is the cooperation with tissue?

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Nature of Energy Electric and Magnetic Fields Photons Kinetic Energy Pressure Vibration Mechanical Heat

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Amount of Energy Total Amount of Energy Absorbed What does it take to raise water temperature? Rate of Absorption (Power or Intensity) How quick does the temperature rise? Standardized to Surface Area (e.g., mJ/cm 2 , mW/cm 2 )

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Interactions Electric and Magnetic Fields Induce Currents Align Molecules Vibrate Molecular Bonds Photons Vibrate Molecular Bonds Disrupt Molecular Bonds

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More Interactions Mechanical Disruption of Tissue Pressure Vibration Force Applications Loss of Tissue Function Thermal: Gain or Loss of Heat

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Bernard Watt-O-Meter {Not Accepted, or Considered Acceptable, by Any Authority} Power Limits for Various Exposures [mW/cm 2 ] Electric and Magnetic Fields 170,000 Radiofrequency/Microwave 1.0 Infrared Light 10 Blue Light 0.0001 Ultraviolet Light 0.0012 Ionizing Radiation 0.00000003 Noise 0.00003 Heat Stress 30

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Exposure Energy Distribution in the Immediate Environment The dissemination is normally depicted as Power or Intensity (specifically or through a surrogate) versus Frequency or Wavelength in Bands

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Exposure Threshold Total Energy Ability to Absorb Energy Rate of Energy (Power or Intensity) Ability to Dissipate Absorbed Energy In a Band Integrated Over All Bands

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Process Committee Activities Development of TLVs ®

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Representation Usually maybe a couple individuals with a skill for a specific specialist (e.g., a little segment of the electromagnetic range) Small council to keep up a working and collegial gathering. We meet in general. Use with outside specialists

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Updating TLVs ® PAC meets with outside specialists Members convey proposals to the PAC for talk Consideration of moves made by national and global panels or offices

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New TLVs ® Quintessential Example: Hand Activity Formed a unit of experts Convened a gathering Developed suggestion and Documentation Presented to PAC and examined PAC voted after interior thoughts

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Future Format Agents

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Format TLV ® Book Use of Flow Charts Evolving (see Heat Stress and RF/MW) Training Documentation Expanded and Focused (see HAL and Lifting) Health Effects and Exposure Indices Guidance (see Heat Stress)

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Form Physical operators have their own history and character concerning estimation and presentation evaluation There is a fundamental likeness among the physical operators that might be presented

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Example Set Radiofrequency/Microwave Radiation Optical Radiation (IR, Visible and UV) Vibration (Hand-Arm and Whole Body) Noise

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1000 100 10 Energy 1 0.1 0.01 0.001 0.01 0.1 1 10 100 1000 Bands Energy Distribution

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1000000 100000 10000 Energy Limit 1000 100 10 1 0.001 0.01 0.1 1 10 100 1000 Bands Energy Limits Within Bands E min

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1000000 100000 10000 1000 Energy 100 10 1 PD Exp Lmt 0.1 0.01 0.001 0.01 0.1 1 10 100 1000 Bands Limits by Band Is the point of confinement surpassed inside at least one groups?

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1000 100 Sensitivity 10 1 0.1 0.001 0.01 0.1 1 10 100 1000 Bands Sensitivity Curve Sensitivity = Energy Limit/E min

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1 0.1 Filter Multiplier 0.01 0.001 0.01 0.1 1 10 100 1000 Bands Hazard Function Hazard Function = 1.0/Sensitivity

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1000 100 10 1 Energy 0.1 0.01 ED E-eff 0.001 0.0001 0.00001 0.001 0.01 0.1 1 10 100 1000 Bands Effective Exposure Effective Exposure = Energy Distribution x Hazard Function

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Total Energy Multiplying Energy Limits by Band Hazard Function by Band and Integrating (Summing) Yields a Constant Value: A Total Energy Limit

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Limit by Total Energy Total Energy In One Band Under the Effective Energy Curve Compared to Total Energy Limit

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In Summary TLVs ® Limit Power (Ability to Dissipate) Limit Total Energy (Ability to Absorb) Limit by Band Total

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Agents Under Review Lasers Vibration Cold Stress Altitude Impulse Noise ELF H-Fields HAL Lifting WMSDs Wide-Band RF

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Scheduled Break Take a moment to extend!

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