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Updated: May 27, 2026

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
Published on: May 9, 2014
Characterization of a CT ionization chamber for radiation field mapping
Ana P Perini1, Lucio P Neves, Vitor Vivolo
1Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN), Comissão Nacional de Energia Nuclear, Av. Prof. Lineu Prestes 2242, 05508-000, São Paulo, SP, Brazil. aperini@ipen.br
A newly developed pencil-type ionization chamber from IPEN shows promising results for radiation field mapping. Its performance closely matches a commercial chamber, indicating its suitability for accurate X-ray measurements.
Area of Science:
- Medical Physics
- Radiation Detection
Background:
- Accurate radiation field mapping is crucial for dosimetry and radiation protection.
- Developing cost-effective and reliable radiation detection equipment is an ongoing need.
Purpose of the Study:
- To characterize a homemade pencil-type ionization chamber developed at Instituto de Pesquisas Energéticas e Nucleares (IPEN).
- To assess the chamber's suitability for radiation field mapping procedures.
- To compare its performance against a standard commercial ionization chamber.
Main Methods:
- Characterization of the pencil-type ionization chamber through various tests.
- X-radiation field mapping using the developed chamber.
- Comparative analysis with a PTW Farmer-type ionization chamber (TN 30011-1).
Main Results:
- Characterization tests yielded satisfactory results, confirming the chamber's functionality.
- Radiation field mapping with the homemade chamber showed good agreement with the PTW Farmer-type chamber.
- The maximum observed difference between the two chambers was only 1.25%.
Conclusions:
- The characterized pencil-type ionization chamber is suitable for radiation field mapping.
- The homemade chamber offers a viable alternative to commercial detectors for X-ray measurements.
- Further validation in diverse radiation fields is recommended.
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