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Directive 2006/25/EC of the European Parliament and of the Council of 5 April 2006 on the minimum health and safety requirements regarding the exposure of workers to risks arising from physical agents (artificial optical radiation) (19th individual Directive within the meaning of Article 16(1) of Directive 89/391/EEC)
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spectral irradiance or spectral power density: the radiant power incident per unit area upon a surface, expressed in watts per square metre per nanometre [W m-2 nm-1]; values of Eλ (λ, t) and Eλ come from measurements or may be provided by the manufacturer of the equipment;
effective irradiance (UV range): calculated irradiance within the UV wavelength range 180 to 400 nm spectrally weighted by S (λ), expressed in watts per square metre [W m-2];
radiant exposure: the time integral of the irradiance, expressed in joules per square metre [J m-2];
effective radiant exposure: radiant exposure spectrally weighted by S (λ), expressed in joules per square metre [J m-2];
total irradiance (UVA): calculated irradiance within the UVA wavelength range 315 to 400 nm, expressed in watts per square metre [W m-2];
radiant exposure: the time and wavelength integral or sum of the irradiance within the UVA wavelength range 315 to 400 nm, expressed in joules per square metre [J m-2];
spectral weighting taking into account the wavelength dependence of the health effects of UV radiation on eye and skin, (Table 1.2) [dimensionless];
time, duration of the exposure, expressed in seconds [s];
wavelength, expressed in nanometres [nm];
bandwidth, expressed in nanometres [nm], of the calculation or measurement intervals;
spectral radiance of the source expressed in watts per square metre per steradian per nanometre [W m-2 sr -1 nm-1];
spectral weighting taking into account the wavelength dependence of the thermal injury caused to the eye by visible and IRA radiation (Table 1.3) [dimensionless];
effective radiance(thermal injury): calculated radiance spectrally weighted by R (λ) expressed in watts per square metre per steradian [W m-2 sr -1];
spectral weighting taking into account the wavelength dependence of the photochemical injury caused to the eye by blue light radiation (Table 1.3) [dimensionless];
effective radiance(blue light): calculated radiance spectrally weighted by B (λ), expressed in watts per square metre per steradian [W m-2 sr -1];
effective irradiance (blue light): calculated irradiance spectrally weighted by B (λ) expressed in watts per square metre [W m-2];
total irradiance (thermal injury): calculated irradiance within the infrared wavelength range 780 nm to 3 000 nm expressed in watts per square metre [W m-2];
total irradiance (visible, IRA and IRB): calculated irradiance within the visible and infrared wavelength range 380 nm to 3 000 nm, expressed in watts per square metre [W m-2];
radiant exposure: the time and wavelength integral or sum of the irradiance within the visible and infrared wavelength range 380 to 3 000 nm, expressed in joules per square metre (J m-2);
angular subtense: the angle subtended by an apparent source, as viewed at a point in space, expressed in milliradians (mrad). Apparent source is the real or virtual object that forms the smallest possible retinal image.
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