Abstract
The energy spectrum of underground gamma rays is measured up to 20 MeV, using a large sodium iodide crystal assembly at a depth of 1230 m in a silver, lead and zinc mine. The results are compared with other experiments and their significance discussed. The effect of this gamma ray background is assessed in terms of the Sydney solar neutrino detector, SUNLAB, that is currently being constructed. In particular, this background defines an acceptable range of threshold energies. Beyond this range, the solar neutrino signal cannot be established within a reasonable running time.
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