IRRADIANCES OF SPECTRAL-LINES IN MERCURY PENCIL LAMPS

The irradiances of 37 spectral lines emitted by mercury pencil-type la mps were measured by comparison with calibrated continuum sources. The lines span the region 230-590 nm. For the 14 most prominent lines the absolute irradiances should he useful for radiometric calibrations at an uncertainty level of similar to 15% (95% confidence). The ratios o f the irradiances for this same group of lines are significantly more reproducible; they should be useful at an uncertainty level of similar to 10%.