Evaluation of the GEANT4 transport algorithm and radioactive decay data for alpha particle dosimetry

Highlights: • A Fano cavity test was implemented to evaluate the GEANT4 alpha particle transport algorithm. • Simulation results with the default electromagnetic transport parameters were found to deviate up to 4.7% from the theory. • The recommended optimal parameters (dRover of 0.1 and final range of 1 μm) lead to an agreement of • GEANT4 alpha energy spectra were compared with the MIRD and RADAR spectra for ²¹²Pb, ²²³Ra, ²²⁷Th, and ²²⁵Ac radionuclides. • Agreement of A Fano cavity test was implemented in GEANT4 Monte Carlo code to evaluate the alpha particle transport algorithm. GEANT4 alpha emission data for ²¹²Pb, ²²³Ra, ²²⁷Th, and ²²⁵Ac was compared with the MIRD and RADAR decay databases. Optimal electromagnetic transport parameters (dRover of 0.1 and final range of 1 μm) were recommended since the calculated results with the default parameters differed up to 4.7% from the theoretical results. Good agreement was found between the three decay databases besides a few discrepancies.