A26 chamber, IBA RAZOR Nano chamber and PTW microDiamond detector have been
characterized in terms of their energy (6 keV to 70 keV) response to X-ray
beams in air at both “N” and “TW” PTB series (18 qualities in total). The
angular dependence of these detectors was also measured at intervals of 10° in
a 180° range with the INTRABEAM at 50 kV and reported relative to the aligned incidence.
The procedure to determine the energy response can be
expanded to other energy ranges and to other detectors and may lead to the
creation of a detector-wise library avoiding the need of the user to
re-calibrate the instrument for every new application and energy range.
The three detectors are promising candidates for 3D
dose measurements of eBT sources in water. In particular, the A26 chamber
exhibits an excellent angular response and a more flatter energy response to
X-ray beams from above 20 keV compared to the other two detectors.
For the conversion of the detector’s response in terms
of absorbed dose to water, MC simulations are currently been done by other
partners of 18NRM02 PRISM-eBT project (see below).
Even when the response is far from flat, the knowledge
of a reliable energy dependence curve allows the use of these detectors in the
dosimetry of low photon energies, in eBT or in other applications of low energy
X-ray conventional beam (as cell culture or small animal irradiators).
research was accomplished within the framework of project 18NRM02 PRISM-eBT
that has received funding from the EMPIR programme co-financed by the
Participating States and from the European Union’s Horizon 2020 research and