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Radon emanation was projected to account for $>50$% of the electron recoilbackground in the WIMP region of interest for the LUX-ZEPLIN (LZ) experiment.To mitigate the amount of radon inside the detector volume, materials withinherently low radioactivity content were selected for LZ construction throughan extensive screening campaign. The SD Mines radon emanation system was one offour emanation facilities utilized to screen materials during construction ofLZ. SD Mines also employed a portable radon collection system for equipment toolarge or delicate to move to a radon emanation facility. This portable systemwas used to assay the Inner Cryostat Vessel in-situ at various stages ofdetector construction, resulting in the inference that the titanium cryostat isthe source of significant radon emanation. Assays of a $^{228}$Th sourceconfirmed that its $^{222}$Rn emanation is low enough for it to be used, andthat 14% of the $^{220}$Rn emanates from the source at room temperature.

Radon Emanation Techniques and Measurements for LZ