title: Use of Channel Electron Multipliers as Secondary Standard Detectors at EUV Wavelengths.
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-A 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.
authors.forename: J G
authors.initials: JG
authors.lastname: Timothy
authors.forename: L B
authors.initials: LB
authors.lastname: Lapson