Abstract
The procedures available for photometric calibration at extreme ultraviolet (EUV) wavelengths are outlined and the requirements for a secondary standard EUV photomultiplier defined. The performance of a number of commercially available channel electron multipliers over the 304–1350-Å wavelength range is described and their suitability for use as secondary standards discussed in detail. Although none of the multipliers evaluated fully met the requirements for a secondary standard it proved possible to calibrate absolutely a Mullard cone channel over the required wavelength range to an accuracy of ±9% and to employ it as a secondary standard in the calibration of a series of sounding rocket spectrometers.
© 1974 Optical Society of America
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