A liquid scintillation detector for radioassay of gadolinium-loaded liquid scintillator for the LZ Outer Detector - Haselschwardt, S.J.; Shaw, S.; Nelson, H.N.; Witherell, M.S.; Yeh, M.; Lesko, K.T.; Cole, A.; Kyre, S.; White, D.T. (Nuclear Inst. and Methods in Physics Research, A, 2019)