Prompt gamma measurements for locating the dose falloff region in the proton therapy

Chul Hee Min, Chan Hyeong Kim, Min Young Youn, Jong Won Kim

Research output: Contribution to journalArticlepeer-review

302 Citations (Scopus)


The location of the distal falloff in the proton therapy is an important but often uncertain parameter as different tissue elements are traversed by the beam. A multilayered collimator system has been constructed as a practical means to locate the dose ends by measuring prompt gammas. The collimator is designed to moderate and capture fast neutrons and to prevent unwanted gammas from reaching the scintillation detector. The system has been studied using Monte Carlo technique and has been tested in the beam energy range of 100-200 MeV. Measurements clearly indicated correlations between the gamma distributions and the distal falloff regions.

Original languageEnglish
Article number183517
JournalApplied Physics Letters
Issue number18
Publication statusPublished - 2006

Bibliographical note

Funding Information:
This research work is performed under the user program of proton engineering frontier project and basic atomic energy research institute supported by the Ministry of Science and Technology of Korea.

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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