Silicon diodes as detectors for backscatter radiation in photon fields

We investigated the use of unencapsulated silicon semiconductor detectors for backscatter radiation detection. The results were compared with Monte Carlo (MC) calculations modelling the experimental set-up. A special diode was manufactured, which was designed so that it allowed the positioning of di...

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Bibliographic Details
Published inOncology reports Vol. 8; no. 1; p. 181
Main Authors Lennernäs, B, Rosengren, B, Rikner, G, Nilsson, B, Montelius, A, Grusell, E
Format Journal Article
LanguageEnglish
Published Greece 01.01.2001
Subjects
Cobalt Radioisotopes
Equipment Design
Lead
Monte Carlo Method
Photons
Polymethyl Methacrylate
Radiometry - instrumentation
Scattering, Radiation
Sensitivity and Specificity
Silicon
Stainless Steel
Titanium
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Summary:We investigated the use of unencapsulated silicon semiconductor detectors for backscatter radiation detection. The results were compared with Monte Carlo (MC) calculations modelling the experimental set-up. A special diode was manufactured, which was designed so that it allowed the positioning of different materials in close contact with the detector surface. Polymethylmethacrylate (PMMA), Pb, Ti and Fe (stainless steel) were used as backscatter materials. The diode signal was measured by integrating the current when irradiating the diode with an equal photon fluence obtained from a medical Co-60 source. When compared to the signal with PMMA as backscatter material the increase in signal was 21%, 27% and 73% for Ti, Fe and Pb, respectively. This is in reasonable agreement with the MC calculations, when taking the effective measurement depth in the Si diode detector into account.
ISSN:1021-335X
DOI:10.3892/or.8.1.181