Investigation of the lateral buildup ratio used for small or irregular field electron dosimetry Public Deposited

Purpose: To verify the accuracy of the lateral buildup ratio (LBR) proposed in TG-70 for the dosimetry of electrons with small or irregular fields and investigate an alternative measurement used for the LBR. Conclusion: The calculations from 𝜎2𝑐𝑚 for all fields, including the irregular field, better matched the measured values when compared to the 𝜎1𝑐𝑚 calculations. For energies at 10 MeV and below, the 𝜎2𝑐𝑚 calculation stayed within 3% of the measured dose at 𝑅90 for all cutouts. The calculations from the 𝜎1𝑐𝑚 parameter varied by as much as 9% of the measured dose at 𝑅90 for 10 MeV, occurring with the 2 cm cutout. For all cutouts and energies, the calculations from 𝜎2𝑐𝑚 produced data closer in depth and percentage of dose to measured 𝑑𝑚𝑎𝑥 and 𝑅90 values.

  • francom.dallin.2019.pdf
Publication Date
  • 2019
Document type