Germicidal light destroys the ability of bacteria, viruses, and other pathogens to multiply by deactivating their reproductive capabilities. This Guide does not apply to the use of lasers which emit in the UV region – these are dealt with in Safety Guide 21. The UV spectrum consists of three regions, as designated by the Commission Internationale de l’Eclairage: For most people, the main source of UV exposure is the sun. The three main types of solar simulators are continuous, flashed, and pulsed, depending on the use. UVR is also used in UV light boxes (transilluminators), germicidal lamps, and UV crosslinkers. For the best experience on our site, be sure to turn on Javascript in your browser. Only artificial light sources emit radiant energy within the UV-C band. Last Updated on June 26, 2018 by opsweb1. In discussing UVR biological effects, the International Commission on Illumination (CIE) has Table 1. Above that wavelength, the TLV is always over 1,000 mJ/cm, Between 180 nm and 240 nm, the radiation becomes increasingly more hazardous to up to 10 mJ/cm, Proper use of the UV light–producing equipment, Proper use of protective equipment provided by the manufacturer (e.g., UV shields/enclosures), as well as PPE. Be aware of the hazards associated with a particular artificial source of UV; if any uncertainty or concern exists regarding safety, contact the point of contact in the Non-ionizing Radiation (NIR) Program for advice. When appropriate, two additional markings will appear on eye protection: Eye protection designed for a smaller head size will be marked with the letter “H.”. The signs and symptoms of an accidental exposure would be erythema of the skin (similar to sunburn) and possible inflammation of the eye caused by lesions on the cornea. The wavelength with the greatest effectiveness is 253.7 nm, which defines the germicidal category. San Diego, CA 92127. At work sites with these conditions, UV rays may reach workers’ exposed skin from both above and below. Wiping the lamp with alcohol before installation is a useful precaution. Gloves should protect personnel from UV light, as well as from the hazard of the activity being performed. Eye and face protection must be inspected either regularly or before each use for damage or defects such as cracks, crazing, or bleaching, and replaced when necessary. At a minimum, lab personnel should be familiar with the following when working with or around UV light: Warning signs are necessary unless the UV radiation is completely enclosed and there is no risk of exposure during use and maintenance. endobj Impact-rated eye protection must pass certain high-mass and high-velocity tests and should provide eye protection from the side. Light and Infrared Exposure Limits The threshold limit values (TLVs) refer to values for incoherent (non-laser) visible and infrared radiation in the wavelength region of 305–3,000 nm that nearly all workers may be exposed to without adverse health effects. Plasma etchers are designed for deposition and etch processes on silicon wafers and other substrates. A xenon arc lamp is a specialized type of gas discharge lamp that produces light by passing electricity through ionized xenon gas at high pressure. DO NOT dispose of UV bulbs in the regular trash. Tungsten halogen lamps are ideal light sources for spectrophotometers as they provide broadband spectral radiation ranging from UV, through the visible, and into the infrared out to 5 microns. Where information on cumulative exposure from the UV source is available or easily measurable, comparison with exposure limits can identify what control measures may be needed. UV safety • There are no regulatory UV radiation exposure limits. Conjunctivitis is an inflammation of the membranes lining the insides of the eyelids and covering the cornea. Ensure that these viewports are correctly assembled and are undamaged. Shown below are some variations of the UV hazard warning sign. <> Note that PPE may need to serve multiple purposes, such as protecting against both chemical splashes and UV. They emit primarily blue and green light. It produces a bright white light that closely mimics natural sunlight. 8 Exposure Limits ... (commonly referred to as a UV light). Most of these instruments are stationary, but a few hand-held types carry the same hazards as the stationary models. Skin conditions or eye infections can also result in increased photosensitivity, even in people who are not normally photosensitive. 1 0 obj Paul Jackson continued: “The headline UV light exposure limits in the Directive for broadband sources state 30 J/m² eff for the skin and eyes exposed to UV light in the wavelength region 180-400 nm and 10,000 J/m² for eyes exposed to wavelengths of 315-400 nm. Interlocks must not be tampered with. It is important to note that UV radiation is harmful to both skin and eyes. The chamber viewports are considered to be a particular risk area. Exposure Limits There is no Occupational Safety and Health Administration (OSHA) standard for exposure to ultraviolet light, but the National Institute for Occupational Safety and Health (NIOSH) recommends that the time of exposure to an intensity of 100 microwatts per square centimeter at wavelength 254 nanometers not exceed 1 minute.

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