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.
A monolithic x-ray interferometer has been developed which provides a means of producing high-quality x-ray Moiré fringes with readily controlled pitch (spacing). It was designed as a calibrator of sub-microradian angular displacements and it has successfully demonstrated the feasibility of the approach. The quality of its output, when combined with the phase imaging capabilities of interferometry and the latest generation of fringe analysis algorithms, suggests additional, novel applications. This paper first reviews the principles and performance of the system as an angular calibrator and then discusses the potential of x-ray Moiré patterns in the form of an x-ray microscope and as a diagnostic tool for ultra-precision metrology. Demonstration results are given mostly in the form of images of fringe fields, since the point here is the production of original data suitable for processing by existing techniques.
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