S.L. 646.22 Art. 2Interpretation.

In these regulations, unless the context otherwise requires -

"Act" means the Health and Safety at Work Act;

"Authority" means the Occupational Health and Safety Authority established by article 4 of the Act;

"exposure limit values" means the limits on exposure to optical radiation which are based directly on established health effects and biological considerations. Compliance with these limits will ensure that workers exposed to artificial sources of optical radiation are protected against all known adverse health effects;

"irradiance (E) or power density" means the radiant power incident per unit area upon a surface expressed in watts per square -2 metre (W m ); "laser (light amplification by stimulated emission of radiation)" means any device which can be made to produce or amplify electromagnetic radiation in the optical radiation wavelength range primarily by the process of controlled stimulated emission; FROM EXPOSURE TO ARTIFICIAL OPTICAL RADIATION)

"laser radiation" means optical radiation from a laser; "level" means the combination of irradiance, radiant exposure and radiance to which a worker is exposed; "the Minister" means the Minister responsible for occupational health and safety; "non-coherent radiation" means any optical radiation other than laser radiation; "optical radiation" means any electromagnetic radiation in the wavelength range between 100 nm and 1 mm. The spectrum of optical radiation is divided into ultraviolet radiation, visible radiation and infrared radiation:

(i) ultraviolet radiation: optical radiation of wavelength range between 100 nm and 400 nm. The ultraviolet region is divided into UVA (315-400 nm), UVB (280-315 nm) and UVC (100-280 nm);

(ii) visible radiation: optical radiation of wavelength range between 380 nm and 780 nm;

(iii) infrared radiation: optical radiation of wavelength range between 780 nm and 1 mm. The infrared region is divided into IRA (780 -1400 nm), IRB (1400 - 3000 nm) and IRC (3000 nm - 1 mm); "radiance (L)" means the radiant flux or power output per unit solid angle per unit area, expressed in watts per square metre per -2 -1 steradian (W m sr ); "radiant exposure (H)" means the time integral of the irradiance, -2 expressed in joules per square metre (J m ).