Atomic and Nuclear PhysicsDOE-HDBK-1019/1-93RADIOACTIVITYRev. 0Page 39NP-01Figure 13 Cumulative Production of Sodium-24 Over TimeThe amount of sodium-24 present will initially increase rapidly, then it will increase at acontinually decreasing rate until the rate of decay is equal to the rate of production. It is possibleto calculate how much sodium-24 will be present at equilibrium by setting the production rate(R) equal to the decay rate ( N).where:R= production rate (atoms/second)= decay constant (second )-1N = number of atomsIt is possible to calculate the equilibrium value for sodium-24 being produced at a rate of1 x 10 atoms/second.6