Preliminary study for determination of distal dose edge by measuring 90-deg prompt gammas with an array-type prompt gamma detection system

Chul Hee Min, Jang Guen Park, Chan Hyeong Kim

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A scanning-type prompt gamma measurement system, called prompt gamma scanner (PGS), was constructed and used to determine the relationship between the proton dose distribution and the longitudinal profile of the prompt gammas generated by the nuclear interaction from the proton beam passage in a medium. However, the PGS system entails insuperable difficulties when used in clinical proton therapy owing to its scanning process. In order to measure the prompt gamma distribution without the scanning process, it was proposed to develop an array-type prompt gamma measurement system that can measure the prompt gammas with a linear array of radiation detectors through multiple collimation slits. Prior to constructing a full-scale measurement system with many detectors and multiple data acquisition channels, a simplified prototype measurement system, using only one detector moving from one measurement location to the next, was constructed in the present study and applied to a 39-MeV proton beam. The results are very encouraging, as the prototype measurement system predicted the distal dose edge very accurately within a few millimeters of error despite the fact that the level of background gammas increased as a result of reduced collimator shielding.

Original languageEnglish
Pages (from-to)89-92
Number of pages4
JournalNuclear Technology
Volume168
Issue number1
DOIs
Publication statusPublished - 2009 Oct

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Condensed Matter Physics

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