Design optimization of a 2D prompt-gamma measurement system for proton dose verification

Han Rim Lee, Jong Hoon Park, Chan Hyeong Kim, Chul Hee Min

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


To verify in-vivo proton dose distribution, a 2-dimensional (2D) prompt-gamma measurement system, comprised of a multi-hole collimation system, a 2D array of CsI(Tl) scintillators, and a position-sensitive photomultiplier tube (PS-PMT), is under development. In the present study, to determine the optimal dimension of the measurement system, we employed a series of Monte Carlo simulations with the MCNPX code. To effectively measure the high-energy prompt gammas while minimizing background gammas, we determined the collimator hole size, collimator thickness, and scintillator length to be 0. 4 × 0. 4 cm 2, 15 cm, and 5 cm, respectively. Thereafter, the performance of the optimized measurement system was estimated for monoenergetic proton pencil beams. The peak locations of the prompt-gamma distributions for 80- and 150-MeV proton beams were clearly distinguished, and the correlation between the beam range and the peak location was confirmed by using the measurement system. For a 200-MeV proton beam, however, the peak location could not be determined due to the dominance of background gammas and the lateral dispersion of the proton beam at the end of the beam range. Based on these simulation results, a prototype 2D prompt-gamma measurement system currently is under construction and, upon completion, will be tested with therapeutic proton beams.

Original languageEnglish
Pages (from-to)239-242
Number of pages4
JournalJournal of the Korean Physical Society
Issue number2
Publication statusPublished - 2012

Bibliographical note

Funding Information:
This research was supported by the National Nuclear R&D Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Educa- tion, Science and Technology (Nos. 2010-0028913, 2010-0023825, and 2012-K001146).

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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