| Full text | |
| Author(s): |
Perini, Ana P.
;
Neves, Lucio P.
;
Maia, Ana F.
;
Caldas, Linda V. E.
Total Authors: 4
|
| Document type: | Journal article |
| Source: | IEEE Transactions on Nuclear Science; v. 60, n. 6, p. 9-pg., 2013-12-01. |
| Abstract | |
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 Opportunities: | Scholarships in Brazil - Doctorate |