Abstract
The Majorana Demonstator will field an array of approximately 40 kg. of high purity germanium crystals. Some of the crystals will be enriched in the double-beta decaying 76Ge isotope. The Majorana Demonstrator will search for the neutrinoless double-beta decay mode, as well as for light WIMP dark matter. The primary experimental challenge is the reduction and estimation of residual radioactive backgrounds. This reduction is achieved by a combination of extremely pure and clean materials, an underground location, passive and active shielding, and data-analysis methods. This poster describes the quantitative background model of the Majorana Demonstrator that takes into account all known sources of residual background radioactivity and the efficacy of the background mitigation schemes.
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