“…The sorption distribution coefficients (K d ) of Pa were determined under ambient conditions in oxic and anoxic (N 2 ) atmospheres using natural fresh and brackish groundwater; and the values obtained were 0.07-2.3 and 1.7-12 m 3 kg -1 , respectively (Kulmala et al, 1998). Pickett and Murrell (1997) presented the first survey of 231 Pa/ 235 U ratios in volcanic rocks; such measurements were made possible by new mass spectrometric techniques.…”
“…The sorption distribution coefficients (K d ) of Pa were determined under ambient conditions in oxic and anoxic (N 2 ) atmospheres using natural fresh and brackish groundwater; and the values obtained were 0.07-2.3 and 1.7-12 m 3 kg -1 , respectively (Kulmala et al, 1998). Pickett and Murrell (1997) presented the first survey of 231 Pa/ 235 U ratios in volcanic rocks; such measurements were made possible by new mass spectrometric techniques.…”
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