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The following can be edited on the Decay tab:
Number of Depth Ranges: This is the number of depth intervals throughout the model where you wish to specify different first order decay constants (eg. radioactive or biological).
Source Decay: This allows the user to select whether first order decay of contaminant will be modelled in the source. If selected the user will be asked to specify the half-life in the source. If not selected the half-life in the source is assumed to be infinite (i.e., no first order decay).
Base Decay: This allows the user to select whether first order decay will be modelled in the base of the deposit (eg. an underlying aquifer). If selected the user will be asked to specify the half-life in the base. If not selected the half-life in the base is assumed to be infinite (i.e., no first order decay).