/*
  In this example, the dose rate decreases exponentially with a half-life
  of 1443.36 h (= half-life for 125I).  The dose rate function is truncated
  at 2886.72 h (2X the value of RHL). The baseline 1 Gy scenario is
  rescaled so that the dose delivered in 2886.72 h equals 140,
  145, or 150 Gy.  A relatively small step tolerance (STOL) is used
  so that  the shape of the dose rate function is very similar to a
  true exponential. Values for STOL in the range from about 0.05 to
  1E-03 should be adequate for most biological simulations.

  NOTE: See the table of selected radioisotope half-lives for other
  radioisotopes.
*/

   DECAY: TAD=1 RHL=1443.36 TCUT=2886.72 STOL=1.0D-02 SAD=RX1
   RX1= 140 145 150 /    !Array of delivered doses (Gy)