Abstract
We have designed a coincidence array consisting of a BGO scintillator surrounded by an annular NaI scintillator specifically for detection of the 4.44 MeV gamma rays from the excited state of 12C following the 1H( 15N, αγ) 12C resonant nuclear reaction used for hydrogen detection in solids. The limits for detection of hydrogen depend on the detector efficiency and background. Background is reduced because a count is accepted only when the NaI detects a 0.511 MeV annihilation gamma ray in coincidence with the detection by the BGO scintillator of the primary gamma ray energy less than the energy of an annihilation gamma ray; that is, 3.93 MeV. Assuming a signal to background ratio of 1, we report a detection limit of 7100 ppma per nA of 15N 3+ ion current with no external shielding.
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