Manual Fine-Tuning Iterations

Introduction

These are the starting conditions of the Calibrate Manually tab following simulated annealing of the radionuclide source strength distribution in the Surface Measurements tab.

CIA245Calibration4
CIA245DoseProfile4

Iteration 1

Begin by adjusting the Dose Calibration slider until the dose profile curve passes through the 5 mm measurement point.

Note: To remove the bump in the curve between 0 and 0.25 mm, increase the nearfield slope and then adjust the crossover and nearfield slope sliders keeping the curve between 0 and 1 mm as smooth as possible by inspection.

CIA245ManualStep1
  1. Next, adjust the Crossover slider to minimize the RMS error in the range 0..5 mm.
  2. Next, adjust the Nearfield slope slider to minimize the RMS error in the range 0..5 mm.
  3. Next, adjust the Anisotropy shift slider to minimize the RMS error in the range 0..5 mm.
  4. Next, adjust the Anisotropy threshold slider to minimize the RMS error in the range 0..5 mm.
  5. Next, adjust the Farfield power slider to minimize the RMS error in the range 0..10 mm.
  6. Next, adjust the Farfield threshold slider to minimize the RMS error in the range 0..10 mm.
  7. Next, adjust the Dose Calibration slider to minimize the RMS error in the range 0..5 mm.

RMS % error (0 to 10.0 mm) = 3.160

CIA245ProfileStep1

Iterations 2,3,4,5 etc...

Repeat steps 2-8 until the RMS error over the range 0..10 mm can no longer be reduced.

CIA245FinalManual

RMS % error (0 to 10.0 mm) = 1.383

CIA245FinalDoseProfile