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APPENDIX F <br /> HALF-LIFE CALCULATION <br /> The mass decay rate calculation assumes a 1st-order degradation rate and the half-life is given as <br /> C1 = C0 e1-k`} <br /> Where <br /> Ct = mass present at time (t) <br /> Co = mass originally present <br /> k = proportionality constant <br /> • t = time in years <br />