BM20 - ROBL - The Rossendorf Beamline

The Rossendorf Beamline (BM20)


Homepage of the Rossendorf Beamline at HZDR

Publications at ResearcherID



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Tel: +33(0)47688 +ext
Andreas Scheinost,
Head of Beamline and Radiochemistry
Joerg Exner,



The Rossendorf Beamline is one of 12 Collaborating Research Group (CRG) beamlines, located at bending magnet 20 of the ESRF. It is owned and operated by the Helmholtz-Zentrum Dresden Rossendorf (HZDR, Germany), and is dedicated to actinide sciences and radioactive waste disposal research. The beamline consists of two experimental stations:

  • RCH-I: equipped for X-ray absorption spectroscopy at ultradilute concentrations (XAS, XANES, EXAFS). This station is fully nuclearized.
  • RCH-II: equipped with a Johann-type spectrometer and a heavy-duty 6-circle goniometer (HR-XANES, XES, RIXS, PXRD, CTR, RAXR). This station will be fully nuclearized in 2020. 

Scientific Applications

  • Fundamental and applied radioecological research to allow for better risk assessments of nuclear waste storage; improved remediation strategies for areas contaminated by radionuclides; chemical speciation of radionuclides in soils, sediments, aquifers, mining shafts etc.; investigation of binding mechanisms of radionuclides with natural and anthropogenic organic matter, micro-organisms, clay minerals, rock surfaces; influence of these interactions on radionuclide migration and retardation in the environment.

Equipment Overview


  • Collimating mirror with Pt, Rh and Si surfaces (water-cooled)
  • Double-crystal monochromator with three pairs of crystals (Si(111), Si(111)90°, Si(311) mounted on one axis (water-cooled)
  • Double-multilayer monochromator
  • Horizontally focussing mirror with two toroids with Pt and Rh coating and a flat Si surface
  • Slits and beam diagnostics after each optical element
  • Useful energy range 5-35 keV with all crystal pairs


  • Standard equipment to perform XANES (X-ray absorption near edge spectroscopy) and EXAFS (extended X-ray absorption fine-structure spectroscopy)
  • 13-element, high-throughput Ge-detector for fluorescence detection of dilute samples
  • 4-element Si-DRIFT detector for higher energy resolution
  • Closed-cycle He-Cryostat for sample cooling down to 15 K
  • Safety features and legal permission to run a range of radionuclides with a maximum activity of 185 MBq
  • Electrochemical cell for in-situ modification of redox
  • Automated sample holders


  • Johann-type spectrometer with 0.5 and 1 m radius, currently operating with one crystal; a full 5-crystal installation will be reday in 2017.
  • 6-circle Huber diffractometer for PXRD, CTR and RAXR; an upgrade to single-Xtal XRD is planned for the future.

Additional Information

Please visit the website of the Rossendorf Beamline at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR).