Feasibility study of an efficient method to measure depth profile of particle ions using a wedge-shaped acrylic block

S. Yamamoto*, T. Yabe, T. Akagi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The depth-profile measurement of particle ions is a time- and labor-consuming task, and thus an efficient method is desired. To solve this problem, we propose a new method to measure depth profiles and test it for carbon ions. In our method, we use a thin silver-activated zinc sulfide (ZnS(Ag)) scintillator plate set against the inner top side of a black box and irradiate a uniform carbon-ion beam to this plate from the upper side. On the ZnS(Ag) plate, a wedge-shaped acrylic block is set to absorb the carbon ions depending on the plate’s position. The scintillation light’s image is reflected by a surface mirror set below the ZnS(Ag) plate and then detected by a cooled charge-coupled device (CCD) camera from the side. We irradiate carbon ions for 6 s and measure the ZnS(Ag) image that is partially attenuated by the wedge-shaped acrylic block. By setting the profile on the measured image, we could estimate the depth profile of the carbon-ion beam, although a quenching of the scintillator is observed around the Bragg peak area. We conclude that our proposed method is promising for efficiently measuring the depth profile of particle ions.

Original languageEnglish
Article numberT06013
JournalJournal of Instrumentation
Issue number6
Publication statusPublished - 2021 Jun
Externally publishedYes


  • Beam-intensity monitors
  • Beam-line instrumentation (beam position and profile monitors
  • Bunch length monitors)
  • Heavy-ion detectors
  • Instrumentation for particle-beam therapy

ASJC Scopus subject areas

  • Mathematical Physics
  • Instrumentation


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