Abstract
Charged Particle Activation Analysis (CPAA) has been used for the determination of the concentration of carbon in HgCdMnTe grown by Metal Organic Chemical Vapour Deposition (MOCVD). The samples were irradiated with a beam of 3.0 MeV 3He ions. 11C is produced by the reaction 12C( 3He, α) 11C and is a positron (β +) emitting radionuclide with a half-life of 20.38 min. At the same time the reaction 16O( 3He, p) 18F produces 18F which is also a β + emitter and has a half-life of 109.72 min. A post-irradiation etching technique has been developed to enable removal of surface contaminants. The radioactivity is determined by a β + spectrometer consisting of two NaI γ-ray detectors (3 × 3 in.) oriented at 180°. The two coincident 511 keV γ-rays emitted at 180° during the positron annihilation are detected. The initial 11C and 18F activities, and hence the oxygen and carbon contributions, can be separated by analysis of the count rate versus time. Analysis shows significant carbon levels in the HgCdMnTe samples.
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