Three-dimensional determination of absorbed dose by spectrophotometric analysis of ferrous-sulphate agarose gel

G. Gambarini, G. Gomarasca, R. Marchesini, A. Pecci, L. Pirola, S. Tomatis

Research output: Contribution to journalArticlepeer-review

Abstract

We describe a technique to obtain three-dimensional (3-D) imaging of an absorbed dose by optical transmittance measurements of phantoms composed by agarose gel in which a ferrous sulphate and xylenol orange solution are incorporated. The analysis of gel samples is performed by acquiring transmittance images with a system based on a CCD camera provided with an interference filter matching the optical absorption peak of interest. The proposed technique for 3-D measurements of an absorbed dose is based on the imaging of phantoms composed of sets of properly piled up gel slices. The slice thickness was optimized in order to obtain a good image contrast as well as a good in-depth spatial resolution. To test the technique, a phantom has been irradiated with a collimated γ-beam and then analysed. Proper software was adapted in order to visualise the images of all slices and to attain the 2-D profiles of the dose absorbed by each slice.

Original languageEnglish
Pages (from-to)643-648
Number of pages6
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume422
Issue number1-3
DOIs
Publication statusPublished - 1999

Keywords

  • 3-D imaging
  • Ferrous-sulphate agarose gel
  • Gel-dosimeter slices
  • Phantoms

ASJC Scopus subject areas

  • Instrumentation
  • Nuclear and High Energy Physics

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