Physics
Scientific paper
Mar 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998nimpb.136..685s&link_type=abstract
Nuclear Instruments and Methods in Physics Research Section B, Volume 136, Issue 1-4, p. 685-688.
Physics
Elastic Recoil Detection, Erda, Hydrogen, Silicates, Diamonds
Scientific paper
A ΔE-E telescope was used in coincidence to separate the isotopes of hydrogen and to improve the sensitivity of hydrogen detection when recoiled with 3.8MeV He+. This was achieved by recording coincident events in both detectors (corresponding to the recoil of H, D or T from the target) thereby excluding any contribution from D (or T) beam contamination to the ERDA spectrum for hydrogen and also eliminating electronic noise from the background. The analysis of standard hydrogen-bearing silicates (6-189wtppm H) suggested that the concentrations at the lower part of this range were resolvable. The lowest counts were accumulated on two fragments of colourless diamond and were <20% of the counts obtained for the standard bearing 6wtppm H. We suggest sensitivities of better than 0.0056wt% H2O (or 75at.ppm H in carbon-rich matrices) are achievable with relative precisions <20% in the range 0-400at.ppm H.
Churms C. L.
Padayachee J.
Prozesky V. M.
Springhorn K.
Sweeney Russell J.
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