ERDA measurement of hydrogen isotopes with a ΔE-E telescope

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Abstract

A ΔE-E telescope for mass separation of the isotopes of hydrogen is described for a 4He bombarding energy of 4.0 MeV. The use of a 13.6 μm Si transmission detector as ΔE detector enabled the separation of ERDA signals from the three isotopes of hydrogen in thick samples containing hydrogen (H), deuterium (D) and tritium (T). Whereas a ΔE detector is normally used as an atomic charge (Z) separator in heavy ion spectroscopy, in this study it was used to separate the different masses of the hydrogen isotopes. H events were fully separated from the other isotopes and the separation between D and T events was such that more than 95% of the signals corresponding to the two isotopes could be extracted for analytical purposes, with the maximum depth information obtainable for a single isotope being about 4.1 × 1018 Ti at./cm2 for H, 5.3 × 1018 Ti at./cm2 for D and 4.8 × 1018 Ti at./cm2 for T. The technique, which is especially useful in targets containing all the isotopes of hydrogen, is illustrated by means of a study of the depth distribution of hydrogen isotopes in solid thick TiDx and TiTx targets.

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