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The BASIC computer program, DIFDEC2, is general enough to apply to many common geological occurrences involving two diffusing and reacting components. The program simulates the following situation: chemical component u is produced by a chemical reaction or radioactive decay in a tabular layer. It simultaneously diffuses out of the layer and reacts or decays to a second component, v, which itself diffuses away from the layer. ooo /^A ??2 It has been used to describe the production of Rn from U and Rn's simultaneous diffusion and decay to a second diffusing component Pb. The program uses the Crank-Nicholson finite-difference technique and consequently is stable for a wide range of values of diffusion coefficients and reaction constants. Optimum accuracy and computing time can be achieved by adjusting space and time increments. The applications are as numerous as the geological situations.

DIFDEC2; a BASIC program for calculating production, diffusion, and reaction of two components in a tabular layer