Abstract
Elastic recoil detection (ERD) has been used to measure the hydrogen content of phlogopite in mantle peridotites from kimberlites. The analysis was made with a 30 μm diameter 2.5 MeV alpha beam from the Brookhaven 3.5 MV Research Electrostatic Accelerator. Recoil hydrogen atoms scattered at 30 ° to the incident beam passed through a 5 μm nickel absorber which was used to stop scattered alpha particles which were then detected with a silicon surface barrier detector. A value of 4 parts per thousand (mass fraction) was measured for the hydrogen concentration in phlogopite.
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