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To ensure the validity of their national standards, National Metrology Institutes (NMIs) participate regularly in international comparisons. In the area of neutron metrology, Section III of the Consultative Committee for Ionizing Radiation is in charge of the organization of these comparisons. From September 2011 to October 2012, the eleventh key comparison, named CCRI(III)-K11, took place at the AMANDE facility of the LNE-IRSN, in France. Participants from nine NMIs came with their own primary reference instruments, or instruments traceable to primary standards, with the aim of determining the neutron fluence, at 1 m distance from the target in vacuum, per monitor count at four monoenergetic neutron fields: 27 keV, 565 keV, 2.5 MeV and 17 MeV.The key comparison reference values (KCRV) were evaluated as the weighted mean values of the results provided by seven participants. The uncertainties of each KCRV are between 0.9% and 1.7%. The degree of equivalence (DoE), defined as the deviation of the result reported by the laboratories for each energy from the corresponding KCRV, and the associated expanded uncertainty are also reported and discussed.Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.The final report has been peer-reviewed and approved for publication by the CCRI, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

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MedAustron is an accelerator facility for proton-, ion-therapy and research which is going to be built in Austria. The facility uses proton beams for scientific applications with kinetic energies up to 800 MeV and therefore, neutron dominated fields up to several hundred MeV can be expected behind shielding. During the operation of the accelerator dose levels have to be monitored with appropriate equipment, such as the WENDI-II REM counter a , to prove that the dose does not exceed the legal limits inside accessible areas. In order to demonstrate the appropriateness of the WENDI II, measurements at the Research Center for Nuclear Physics (RCNP) facility at Osaka University of Japan were conducted in quasi monoenergetic neutron beams of 246 MeV and 389 MeV. In the literature the WENDI-II detector was already characterized in mixed fields at CERN as well as quasi monoenergetic fields up to 173 MeV at the T. Svedberg Laboratory. This paper provides a characterization for neutron fields at higher energies and compares the measurements with FLUKA simulations. Additionally, a series of measurements with iron shielding of different dimensions was conducted as the WENDI-II will be utilized behind thick shielding at MedAustron.

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