Detection of Parts-Per-Million Levels of Hydrogen in Solids Using a Modified Notched Neutron Spectrum Technique

Determination of Hydrogen in CVD Diamond by Notched Neutron Spectrum Technique and Ftir

“…The Ti/Al samples were charged to contain a few weight percent of hydrogen and the hydrogen content determined by weight gain. These two different sets of samples indicated that the teclmique was linear over four orders of magnitude in predicting hydrogen content and established an absolute calibration of the system (8).…”

“…These foils are an alloy of 0 .5% indium in lead. The amount of indium in these foils is sufficient to produce --0.5 µCi of activation at saturation [8]. The primary activation product of indium is 116 In, which has a 54.2 minute halflife.…”

A neutronic method to determine low hydrogen concentrations in metals

“…On the other hand, the method is insensitive to possible alteration processes of the sample caused by other elements, such as oxidation, since the presence of hydrogen is manifested by its low atomic weight. The detection limit is higher than the limit of differential techniques based on neutron scattering [7], but in turn it offers more simplicity both for data processing and the instruments required for its implementation. Furthermore, it is more sensitive than integral techniques based on neutron transmission experiments.…”

“…The method also has characteristics similar to other methods proposed [7] but its implementation is easier since neutron detection is carried out in an integral fashion.…”

“…Neutron scattering techniques [6][7][8]. These techniques make use of the considerable energy loss of the neutrons dispersed by hydrogen nuclei, as opposed to the essentially elastic nature of atom dispersion in high atomic masses.…”