Geant4 Simulation of Number of Event Effect on the TLD LiF: Mg, Cu, P Energy Response

The effect of different number of events on the energy response of a bare thermoluminescent dosimeter (TLD) LiF: Mg, Cu, P chip has been simulated using Geant4. This simulation aims to determine the optimum number of events with minimum computational time. Fourteen photon energies in a range of 16–1250 keV with a range of 2×10 – 2×10 events were applied. A LiF: Mg, Cu, P chip with 4.5 mm diameter and 0.9 mm thick on the surface of 30×30 cm water phantom and a thin 10 μm slice of water (at 10 mm deep in the phantom) were considered as the sensitive volumes to calculate the respective absorbed dose DTLD and DW. The relative energy response R was calculated from DTLD and DW‘s ratio for each energy normalized to DTLD and DW ratio of energy 662 keV. 2×10 number of events were found to be the optimum number of events with minimum computational time. The simulation results were validated to the measurement results and the mean deviation of 0,59% was yielded. As the deviation is within the acceptable limit of ±25%, it was concluded that the results were considered satisfactory and the materials and physics processes applied in the code were correct.