High-accuracy X-ray detector calibration based on cryogenic radiometry

Journal Article · Wed Jun 23 00:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3463341· OSTI ID:21410345

Krumrey, M; Cibik, L; Mueller, P ^[1]

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1. Physikalisch-Technische Bundesanstalt (PTB), Abbestrasse 2-12, 10587 Berlin (Germany)

Cryogenic electrical substitution radiometers (ESRs) are absolute thermal detectors, based on the equivalence of electrical power and radiant power. Their core piece is a cavity absorber, which is typically made of copper to achieve a short response time. At higher photon energies, the use of copper prevents the operation of ESRs due to increasing transmittance. A new absorber design for hard X-rays has been developed at the laboratory of the Physikalisch-Technische Bundesanstalt (PTB) at the electron storage ring BESSY II. The Monte Carlo simulation code Geant4 was applied to optimize its absorptance for photon energies of up to 60 keV. The measurement of the radiant power of monochromatized synchrotron radiation was achieved with relative standard uncertainties of less than 0.2 %, covering the entire photon energy range of three beamlines from 50 eV to 60 keV. Monochromatized synchrotron radiation of high spectral purity is used to calibrate silicon photodiodes against the ESR for photon energies up to 60 keV with relative standard uncertainties below 0.3 %. For some silicon photodiodes, the photocurrent is not linear with the incident radiant power.

• OSTI ID: 21410345
• Journal Information: AIP Conference Proceedings, Vol. 1234, Issue 1; Conference: SRI 2009: 10. international conference on radiation instrumentation, Melbourne (Australia), 27 Sep - 2 Oct 2009; Other Information: DOI: 10.1063/1.3463341; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BESSY STORAGE RING
CALIBRATION
COMPUTERIZED SIMULATION
COPPER
COVERINGS
CRYOGENICS
ELECTRON SPIN RESONANCE
ELECTRONS
HARD X RADIATION
IMPURITIES
KEV RANGE 10-100
MONTE CARLO METHOD
OPERATION
PHOTODIODES
PHOTONS
RADIOMETERS
SILICON
SYNCHROTRON RADIATION
BOSONS
BREMSSTRAHLUNG
CALCULATION METHODS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FERMIONS
IONIZING RADIATIONS
KEV RANGE
LEPTONS
MAGNETIC RESONANCE
MASSLESS PARTICLES
MEASURING INSTRUMENTS
METALS
RADIATION DETECTORS
RADIATIONS
RESONANCE
SEMICONDUCTOR DEVICES
SEMICONDUCTOR DIODES
SEMIMETALS
SIMULATION
STORAGE RINGS
TRANSITION ELEMENTS
X RADIATION