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ST 1.2 –
Dosimetría externa
ENERGY DEPENDENCE EVALUATION OF A ZnO AS
DIAGNOSTIC X-RAY DETECTOR
Varela Valença, Cláudia Patricia
1*
; Pereira Dos Santos, Luiz Antônio
2
;
Liborio Da Silveira, Matheus Augusto
3
; Andrade Macedo, Marcelo
3
1
Universidade Federal de Pernambuco-UFPE. Brasil.
2
Centro Regional de Ciência Nucleares do Nordeste-CRCN-CNEN. Brasil.
3Universidade Federal de Sergipe-UFS. Brasil.
* Autor Responsable, email:
claudia.cpvv@gmail.com
In the last decades the international organizations of human health and radiation protection
have recommended certain care for using of the X-ray as a diagnosis tool to avoid any type of
radiological accident or overdose to the patient. This can be done assessing the parameters of
the X-ray equipment and there are various types of detectors available for that: ionizing
chamber, electronic semiconductor devices, etc. These detectors must be calibrated so that
they can be used for any energy range and such a procedure is correlated with what is called
the energy dependence of the detector. In accordance with the stated requirements of IEC
61267, the standard radiation quality beams and irradiation conditions (RQRs) are the tools and
techniques for calibrating diagnostic X-Ray instruments and detectors. The purpose of this work
is to evaluate the behavior of the energy dependence of a detector fabricated from a zinc oxide
(ZnO) nanofilm. A Pantak industrial X-ray equipment was used to generate the RQR radiation
quality beams and test three ZnO detector samples. A 6430 sub-femto-ammeter, Keithley, was
used to bias the ZnO detector and simultaneously perform the output readings. The results
showed that the ZnO device has some increase in its sensitivity to the ionizing radiation as the
X-ray effective energy decreases unlike other types of semiconductor electronic devices
typically used as an X-ray detector. We can be concluded that, after calibration, the ZnO device
can be used as a diagnostic X-ray detector.