Some characterization tests for an extrapolation chamber in CT standard beams in a specific chamber depth
DOI:
https://doi.org/10.15392/bjrs.v8i1A.1085Keywords:
Extrapolation chamber, computed tomography, dosimetry.Abstract
The use of Computed Tomography (CT) for diagnostic images has been growing due to technological advances of this equipment. Therefore, there is a concern regarding the dose received by the patients undergoing this procedure, and this procedure needs to be performed with the highest precision and accuracy possible.
The radiation detector used for CT beams is a pencil-type ionization chamber. However, there is no primary standard system for this kind of radiation beam. In this work a homemade extrapolation chamber was used to establish a CT primary standard [1]. This detector was tested for low-energy radiation beams and showing results within the internationally acceptable limits [2].
This work had the objective to study the response stability of an extrapolation chamber, as well as obtaining the energy dependence and the angular dependence in standard CT beams of the Calibration Laboratory of IPEN (LCI).
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DIAS, S.K.; CALDAS, L V E. Extrapolation chamber response in low-energy radiation standard beams. J. Appl. Phys. 89, 669-671, 2001.
NEVES, L P; SILVA, E A B; PERINI, A P; MAIADANA, N L; CALDAS, L V E. Characterization of an extrapolation chamber for low-energy X-rays: Experimental and Monte Carlo preliminary results. Appl. Radiat. Isot. 70, 1388-1391, 2012.
IEC - International Electrotechnical Commission. Medical electrical equipment-dosimeters with ionization chambers and/or semi-conductor detectors as used in X-ray diagnostic imaging. IEC 61267 Genève, 1997.
IEC – International Electrotechnical Commission. Medical Diagnostic X-ray Equipment. Radiation conditions for use in the determination of characteristics. IEC 61267. 2nd ed. Genève, 2005.
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