The relationship between electrolytic deuterium and tritium separation factors, and attainment of improved accuracy in radiometric low-level tritium measurement

Abstract

Data for deuterium and tritium separation factors in alkaline electrolytic enrichment show close adherence to a linear ln/ln relationship. Possible mechanisms for the two-step cathode reaction on mild steel or iron are considered. The results are consistent with a Volmer-reaction discharge step, followed by chemical desorption (Tafel-reaction) which develops increasing separation capability as hydrogen penetrates and embrittles the surface. Substantially improved measurement accuracy for low-level tritium can result if enrichments are calibrated by deuterium measurement and performed with carefully controlled procedures; over most of the present range of environmental tritium concentrations the routine accuracy appears better than the 3He ingrowth method.