Neutron Depth Profiling "Chambers"
Neutron Depth Profiling (NDP) is a nondestructive analytical technique for measuring the concentration profile of isotopes from several light elements as a function of depth. The concentration profile in the first few micrometers of a surface is determined by analyzing the energy spectrum of charged particles promptly emitted following neutron capture by the element.
The figures above represent a few examples of largely unprocessed NDP spectra. The data illustrates several nuclides analyzed by NDP within the near surface of materials. After data processing, the quantity of nuclide is determined. Although not always necessary, if the sample composition is well known a depth scale can be assigned to create an elemental concentration profile.
Metrological Attributes of NDP
Chemical & Ionization state independent
Nearly interference free
Good depth resolution (nm's)
Few to 10's of µm depth of view
Little or no sample preparation required
Almost unlimited sample size or shape
Moderate time resolution (seconds to hours)