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government agencies operate UV monitoring programs that employ instrumentation falling into three distinctly different categories: broad-band sensors of radiation intensity within a spectral region between two specified levels, narrow-band instruments measuring radiation in several well-defined wavelength intervals, and spectral devices providing detailed information on radiation intensity as a function of wavelength. The new approach allows the sample temperature to be maintained constant despite variations in ambient daytime temperature and solar radiation intensity. Unlike filament lamps, an arc lamp can produce peak radiation intensity within the highly absorbable wavelengths of the silicon surface. |
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