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Abstract

The Monte Carlo codes EGS4 and MCNP have been compared when calculating radiotherapy depth doses in water. The aims of the work were to study (i) the differences between calculated depth doses in water for a range of monoenergetic photon energies and (ii) the relative efficiency of the two codes for different electron transport energy cut-offs. The depth doses from the two codes agree with each other within the statistical uncertainties of the calculations (1-2%). The relative depth doses also agree with data tabulated in the British Journal of Radiology Supplement 25. A discrepancy in the dose build-up region may by attributed to the different electron transport algorithims used by EGS4 and MCNP. This discrepancy is considerably reduced when the improved electron transport routines are used in the latest (4B) version of MCNP. Timing calculations show that EGS4 is at least 50% faster than MCNP for the geometries used in the simulations.

Discrete beta dose kernel matrices for nuclides applied in targeted radionuclide therapy (TRT) calculated with MCNP5

“…Interesting enough, good accordance between the ITS mode of MCNP and EGS4 even with 90 Y has been already been demonstrated. 26,34 Moreover, the authors want to stress two points: First 90 Y is the only nuclide where MIRD 17 and our study disapprove considerably. Secondly, the 90 Y data provided in MIRD 17 differ from all other kernels provided by MIRD and our study in terms of the general behavior of the curve.…”

Targeted radionuclide therapy: theoretical study of the relationship between tumour control probability and tumour radius for a32P/33P radionuclide cocktail

“…MCNP is commonly used for simulating the electron and photon transport in radiotherapy applications. Validation studies (see, e.g., Love et al 1998, Jeraj et al 1999, Chibani and Li 2002 have shown that a good agreement between dose measurements in tissue-equivalent materials and dose distributions computed with MCNP can be achieved when applying the ITS-style algorithm.…”

Physical models, cross sections, and numerical approximations used inMCNPandGEANT4Monte Carlo codes for photon and electron absorbed fraction calculation

“…Three of the most important issues affecting the absorbed dose estimates are briefly presented below, as these points have already been studied and pointed out before. [16][17][18][19][20][21][22]…”