The MKIII BREWER is sometimes called the "double" BREWER, due to its stacked spectrometer manufacturers format. This distinguishes it from the MKII model, which has one spectrometer. The combination of the MKIII's double pass design, spectral filtering, and detector bandwidth reduce the effects of stray light to the lowest possible level making it a highly effective instrument for UV radiation studies.

A Reference Instrument for UV Monitoring Networks:

The BREWER Spectrophotometer manufacturers consists of a weatherproof spectrophotometer, azimuth tracker and stand. It provides near simultaneous observations of the total ozone column, SO

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, and UV spectra. The two-axis tracking, appropriate filter selections, on-board wavelength calibration and data logging are managed through internal electronics and an IBM compatible host computer. Control software for the PC enables 24hr scheduling and remote unattended operation.

Ultraviolet (UV) radiation has been linked to skin cancer, skin aging, cataracts, and immune system suppression in humans and animals. In plants, enhanced UV radiation exposure has lead to crop damage and reduced yields. From the point of view of risk assessment, exposure to UV radiation represents a large potential hazard. Although the necessity of UV monitoring is clear, the nature of the radiation and our sensitivity to it pose data collection challenges. If left unaddressed these challenges could leave our under-standing of future UV trends and impacts uncertain. This is particularly true with damaging ultraviolet (DUV) studies. Unless the spectrum of solar UV is well known it is difficult to relate UVA and UVB intensities to bio- logical responses. For reliable solar spectral UV irradiance measurement, instrumentation must possess specific qualities. The BREWER Spectrophotometer exemplifies these qualities and provides the means to understand solar UV radiation and its current and future impact on the biosphere.

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SPECTROPHOTOMETER

BREWER SpectrophotometerWhy the leading UV and ozone researchers choose the MKIII:

Excellent stray light reduction

because solar UV intensities are low

High wavelength accuracy

because small wavelength shifts can be significant

Appropriate wavelength range

natural UV input and erythemal action spectrum (UV Index)

Superior long-term stability

absolute measurements demand stable, calibrated instruments, especially for UV trend detection

Non-variable instrument function

reduces systematic error

Directional response

cosine collector and direct sun port for detailed research

Automated celestial tracking

provides high accuracy total ozone column measurements anywhere. SOLAR & ATMOSPHERIC SCIENCE