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Synchrotron-radiation-based cryogenic radiometry in the X-ray range

M Krumrey, C Herrmann, P Müller and G Ulm

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The Physikalisch-Technische Bundesanstalt (PTB) has installed an X-ray radiometry beamline at the new electron storage ring BESSY II. The synchrotron radiation is monochromatized by a four-crystal monochromator in the photon-energy range from 1.75 keV to 10 keV. The known radiant power, determined with a cryogenic electrical-substitution radiometer (ESR) as primary detector standard, is used for the calibration of detectors such as semiconductor photodiodes. Relative uncertainties of spectral responsivity well below 1 % have been achieved.


PACS

07.20.Mc Cryogenics; refrigerators, low-temperature equipment

07.85.Qe Synchrotron radiation instrumentation

06.20.F- Units and standards

07.85.Fv X- and gamma-ray sources, mirrors, gratings, and detectors

06.20.Dk Measurement and error theory

29.20.db Storage rings and colliders

07.60.Dq Photometers, radiometers, and colorimeters

Subjects

Accelerators, beams and electromagnetism

Nuclear physics

Instrumentation and measurement

Particle physics and field theory

Dates

Issue 5 (October 2000)



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