lasersafetyatfermilab(已修改)
2024-10-28 15:34 本頁面
【正文】 Laser Safety at Fermilab Blast from the past! – 10/17/2020 Laser beam safety: a plex problem? ? Lasers are everywhere ? They vary in every respect ? How do we know that people are safe? Laser applications at Fermilab CDF nitrogen laser enclosure (2 lasers) A0 photoinjector accessory table Laser applications at Fermilab IB1 GammeV experiment laser enclosure Laser hazard factors radiation ? Intensity / Duration ? Wavelength – Kind of effect – Threshold exposure ? Modulation – CW – rPW – Other Laser hazard factors people ? Part of body exposed – Eye most important ? Body covers – Laser protective eyewear – Other ? Preexisting conditions Laser accidents ? RLI – Rockwell Laser Institute – Examined 417 laser accidents – 19642020 ? DOE – 34 laser incidents – 19832020 RLI – overall analysis ? Unanticipated eye exposure during alignment. ? Available eye protection is not often used. ? Equipment malfunction causes many unwanted exposures. ? Improper methods of handling high voltage lead to severe shock and even death. RLI – overall analysis ? Protection for nonbeam hazards is often lacking. ? Improper restoration of equipment following service frequently causes undesired hazards. ? Incorrect eyewear selection and/or eyewear failure are frequent causes of unwanted exposure. DOE – overall analysis ? Eye exposure – 67% of all incidents ? Alignment – 47% of all incidents – 63% of eye incidents ? Immediate causes – Failure to verify beam off – Fully qualified person absent Spectral distribution ? UV Ultraviolet radiation – Less than mm ? Standard starts at mm ? VIS Visible radiation – to mm ? IR Infrared radiation – Greater than mm ? Retinal hazard region to mm ? Far
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