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For soft X-ray radiometry source and detector standards are required. The electron storage ring can serve as a primary source standard with an uncertainty in spectral radiant power of 2 %. Transfer source standards are being developed with uncertainties of 10 to 15 %. Ionization chamber, proportional counter and Si(Li)-detector can with limitations serve as primary detector standards. Radiant power determination with uncertainties of 3 to 6 % are achievable. Calibrated Al203 diodes are available as transfer detector standards for wavelengths > 5 nm with a calibration uncertainty of 10 %.
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