Determination of the distal dose edge in a human phantom by measuring the prompt gamma distribution: A monte carlo study

Chul Hee Min, Han Rim Lee, Yeon Su Yeom, Sungkoo Cho, Chan Hyeong Kim

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The close relationship between the proton dose distribution and the distribution of prompt gammas generated by proton-induced nuclear interactions along the path of protons in a water phantom was demonstrated by means of both Monte Carlo simulations and limited experiments. In order to test the clinical applicability of the method for determining the distal dose edge in a human body, a human voxel model, constructed based on a body-composition-approximated physical phantom, was used, after which the MCNPX code was used to analyze the energy spectra and the prompt gamma yields from the major elements composing the human voxel model; finally, the prompt gamma distribution, generated from the voxel model and measured by using an array-type prompt gamma detection system, was calculated and compared with the proton dose distribution. According to the results, effective prompt gammas were produced mainly by oxygen, and the specific energy of the prompt gammas, allowing for selective measurement, was found to be 4.44 MeV. The results also show that the distal dose edge in the human phantom, despite the heterogeneous composition and the complicated shape, can be determined by measuring the prompt gamma distribution with an array-type detection system.

Original languageEnglish
Pages (from-to)2059-2062
Number of pages4
JournalJournal of the Korean Physical Society
Volume56
Issue number61
DOIs
Publication statusPublished - 2010

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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