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## Homework Statement

In an experiment, the isotope I-128 is created by bombarding I-127 with neutrons. This creates 1.5E6 I-128 atoms per second. Initially there are no I-128. The half-life of I-128 is 25 minutes. Find the equation that represents the number of I-128 atoms as a function of time.

## Homework Equations

dy/dt=creation rate-decay rate

## The Attempt at a Solution

I set up dy/dt=(1.5E6)t-ay.

a is the decay rate in e^(-at), and y(t) is the number of I-128 after time t.

I tried solving this as a first order linear equation and got a horriable answer. Where am I going wrong?