This form sets up input for 1 dimensional column models with upwelling rate W0, maximum porosity phi0, initial relative activities that are not necessarily in equilbrium and melting and partition coefficent information in the spreadsheet. This model outputs concentration and activity ratios as a function of depth/pressure for the two U-series chains 238U->230Th->226Ra and 235U->231Pa. Have fun and may the force be with you.