In developing the Field Investigation Report for the Waste Management Area S-SX at the Hanford Site, 137 Cs was the only gamma emitting radionuclide of concern (Knepp 2002). a However, in WMA B-BX-BY, the spectral gamma logging data identify seven gamma emitting radionuclides, 137 Cs, 125 Sb, 152 Eu, 154 Eu, 60 Co, 235 U, and 238 U (DOE-GJPO 1998). b The geochemical behaviors of several of these radionuclides, 125 Sb and the two europium isotopes, have not been extensively investigated at the Hanford Site. This task was initiated to assure that our understanding of the geochemical properties affecting the environmental behavior of these radionuclides reflects the current state of knowledge. A literature review was conducted to assess the important oxidation/reduction, aqueous speciation, solubility, and adsorption processes affecting the environmental behavior of antimony, cobalt, europium, technetium, and uranium in vadose zone sediments with low-organic matter content in semi-arid environments such as those at the Hanford Site. Technetium-99 was included in this task because of its importance in the long-term risk calculations. This report presents the results of this literature review.