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REVIEW OF CHANGES IN ANSI Z136.1-2007 Johnny Jones

REVIEW OF CHANGES IN ANSI Z136.1-2007 Johnny Jones. MOST IMPORTANT CHANGES. Laser Classifications Laser Safety Program Measurement Conditions Aspects of Hazard Evaluation Changes to Control Measures Education and Training Medical Surveillance Non-Beam Hazards. Section 1. General

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REVIEW OF CHANGES IN ANSI Z136.1-2007 Johnny Jones

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  1. REVIEW OF CHANGES IN ANSI Z136.1-2007 Johnny Jones

  2. MOST IMPORTANT CHANGES Laser Classifications Laser Safety Program Measurement Conditions Aspects of Hazard Evaluation Changes to Control Measures Education and Training Medical Surveillance Non-Beam Hazards

  3. Section 1. General Classification New classes 1M & 2M Class 3a 3R (expanded beams are 1M or 2M) Class 3b 3B Appendix H compares classes with IEC 60825 FLPPS (CDRH)

  4. Section 1. General 1.3. Laser Safety Programs Replaces old 1.3 Laser Safety Officer New normative Appendix A includes LSO responsibilities Laser Safety Committee Responsibilities of employees and supervisors (formerly informative) Recommendation to contact LSO for individuals purchasing lasers and fabricating, altering, or installing class 3B or 4 lasers

  5. Section 2. Definitions Revised alpha max., alpha min., aperture, blink reflex, coherent, divergence, embedded laser, infrared, laser pointer, limiting angular subtense, limiting aperture diameter, limiting cone angle, MPE, NHZ, optically aided viewing, small source, pulse duration, service, visible radiation. Added Condition 1, Condition 2, epithelium, eye-safe laser, laser classification, laser personnel, magnified viewing, measurement aperture, monochromatic light, normative appendix, photochemical effect, telescopic viewing, thermal effect. Deleted Aphakic, calorimeter, cryogenic, denaturation, depigmentation, dermatology, diopter, endoscope, fundus, radiant intensity, Rayleigh scattering, stromal haze, synergism.

  6. Section 3. Hazard Evaluation Access to beam path (considering enclosures, baffle, beam, etc.) added to environmental considerations. Classification and labeling in accordance with IEC 60825-1 Ed. 1.2 under CDRH Laser Notice 50 is acceptable. Optical transmission excluded from classification for optically aided viewing (but still included for hazard evaluation). LSO may declare the laser use area as the NHZ in lieu of calculating all possible NHZ distances. Visitors added to pesonnel groups. Research settings added to scenario where “the principal hazard control rests with the operator”.

  7. Measurement Conditions and Distances ANSI Z136.1 IEC 60825 Telescope/ Condition 1 Condition 1 Binoculars (200 cm) (2000 mm) Eye Loupe/ Condition 2 Condition 2 Magnifier (10 cm) (70 mm) Unaided Condition 2 Condition 3 Viewing (10 cm) (100 mm)

  8. Section 4. Control Measures Relaxation of unattended laser operation of class 1M, 2, 2M, and 3R (only “shall be provided with a clearly visible label”) Changes/Additions to Engineering Controls User-created enclosures are “barriers” unless interlocked. Momentary action key control with removable key added. Key switch downgraded to “should” for class 4. (Incorrect in Table 10) Alignment procedures added (formerly informative). Outdoor controls and navigable airspace requirements expanded to cover all classes. Windows & barriers labeled if sold “other than as an integral part of a product.” Threshold limit value not required for barriers. OD required on warning sign if eyewear required.

  9. Section 5. Education and Training Refresher training changed from informative to normative. Users to include “any persons potentially exposed” to levels in excess of Class 1. Training to include warnings against the misuse of lasers. Training on “electrical safety” extended to “safety procedures for non-beam hazards”.

  10. Section 6. Medical Examinations Title changed from “Medical Surveillance”. In case of injury, medical examination to be performed “as soon as practical”, usually within 48 hours. Medical surveillance downgraded to “should” for Class 3B and 4 lasers. Medical surveillance “not recommended” for Class 1, 1M, 2, 2M, and 3R lasers.

  11. Section 7. Non-Beam Hazards Written SOP “shall” address non-beam hazards as well as beam hazards. Non-beam hazards grouped as physical, chemical, and biological agents. Control measures added to each group. Resistive heating and spark ignition added. Sensors and alarms in gas cabinets. New guidance on laser disposal.

  12. Section 8. Criteria for Exposure of Eye and Skin “Small source” changed to “point source”. For non-circular extended sources geometric mean changed to arithmetic mean. Paragraph on repeated exposures in the infrared was modified for clarity (but nothing really changed).

  13. Section 9. Measurement Classification based on the point of greatest hazard but no closer than distances in Table 9.

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