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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Characterization and Simulation of a New Design Parallel-Plate Ionization Chamber for CT Dosimetry at Calibration Laboratories

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Perini, Ana P. [1] ; Neves, Lucio P. [1] ; Maia, Ana F. [2] ; Caldas, Linda V. E. [1]
Total Authors: 4
[1] Comissao Nacl Energia Nucl IPEN CNEN SP, Inst Pesquisas Energet & Nucl, BR-05508000 Sao Paulo - Brazil
[2] Univ Fed Sergipe, Dept Fis, BR-9100000 Sao Cristovao, SE - Brazil
Total Affiliations: 2
Document type: Journal article
Source: IEEE Transactions on Nuclear Science; v. 60, n. 6, 2, p. 4641-4649, DEC 2013.
Web of Science Citations: 0

In this work, a new extended-length parallel-plate ionization chamber was tested in the standard radiation qualities for computed tomography established according to the half-value layers defined at the IEC 61267 standard, at the Calibration Laboratory of the Instituto de Pesquisas Energeticas e Nucleares (IPEN). The experimental characterization was made following the IEC 61674 standard recommendations. The experimental results obtained with the ionization chamber studied in this work were compared to those obtained with a commercial pencil ionization chamber, showing a good agreement. With the use of the PENELOPE Monte Carlo code, simulations were undertaken to evaluate the influence of the cables, insulator, PMMA body, collecting electrode, guard ring, screws, as well as different materials and geometrical arrangements, on the energy deposited on the ionization chamber sensitive volume. The maximum influence observed was 13.3% for the collecting electrode, and regarding the use of different materials and design, the substitutions showed that the original project presented the most suitable configuration. The experimental and simulated results obtained in this work show that this ionization chamber has appropriate characteristics to be used at calibration laboratories, for dosimetry in standard computed tomography and diagnostic radiology quality beams. (AU)

FAPESP's process: 10/01070-4 - Development of a cavitary ionization chamber with metrological quality to be used as a standard system for gamma radiation.
Grantee:Lucio Pereira Neves
Support type: Scholarships in Brazil - Doctorate