Dosimetric response of fabricated Ge-doped optical fibres in computed tomography RQT beam quality x-ray beams

Novel germanium (Ge)-doped silica glass fibres tailor-made in Malaysia are fast gaining recognition
as potential media for thermoluminescence (TL) dosimetry, with active research ongoing into
exploitation of their various beneficial characteristics. Investigation is made herein of the
capability of these media for use in diagnostic imaging dosimetry, specifically at the radiation
dose levels typically obtained in conduct of Computed Tomography (CT). As a first step within such
efforts, there is need to investigate the performance of the fibres using tightly defined spectra,
use being made of a Philips constant potential industrial x-ray facility, Model MG165, located at
the Malaysian Nuclear Agency Secondary Standards Dosimetry Lab (SSDL). Standard radiation beam
qualities (termed RQT) have been established for CT, in accord with IEC 61267: 2003 and IAEA
Technical Reports Series No. 457: 2007. A calibrated ionisation chamber has also been utilised,
forming a component part of th...

Source: Journal of Radiological Protection - July 3, 2019 Category: Physics Authors: N N M Rais, D A Bradley, A Hashim, N M Isa, N D Osman, I Ismail, H A Hassan and N M Noor Source Type: research