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A feasibility study of a solid-state microdosimeter.

S Agosteo1, P G Fallica, A Fazzi

  • 1Dipartimento di Ingegneria Nucleare, Politecnico di Milano, via Ponzio 34/3, 20133 Milan, Italy. stefano.agosteo@polimi.it

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|July 26, 2005
PubMed
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This study explores a silicon detector telescope for microdosimetry, finding the field-funnelling effect negligible. Preliminary results suggest potential for accurate measurements with tissue-equivalent converters.

Area of Science:

  • Medical Physics
  • Radiation Detection
  • Nuclear Instrumentation

Background:

  • Solid-state silicon detectors offer high spatial and energy resolution for microdosimetry.
  • Limitations include electronic noise, radiation hardness, geometry, field-funnelling, and non-tissue equivalence.

Purpose of the Study:

  • To investigate the feasibility of a silicon detector telescope as a solid-state microdosimeter.
  • To evaluate the use of a DeltaE stage with a tissue-equivalent converter.

Main Methods:

  • A monolithic silicon telescope with DeltaE (1 micrometer) and E (500 micrometer) detectors was designed.
  • Irradiations with monoenergetic neutrons were conducted.
  • Monte Carlo simulations using the FLUKA code were performed for comparison.

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Main Results:

  • The field-funnelling effect was found to be negligible based on experimental data and simulations.
  • Preliminary analytical methods for correcting geometrical effects and tissue equivalence were presented.

Conclusions:

  • A silicon detector telescope shows promise as a solid-state microdosimeter.
  • Further development of analytical corrections is needed for improved accuracy.