The amount of radioactive contaminant evenly distributed in a reactor closed is measured by its concentration c (becquerel/liter or Bq/L). the contaminant it decreases at a rate of decay proportional to its concentration; that is, Decay rate = –kc where k is a constant, with unit of day–1 . Therefore, according to the Equation below, a mass balance for the reactor can be written as Use Euler's method to solve this equation from t=0 to 0.5d with k=0.175 d–1 . use a step size ∆t = 0.1 d. The concentration at t = 0 is 100 Bq/L.

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