Dose distributions of the INTRABEAM electronic brachytherapy system measured with traceable detectors

Abstract In this work, a methodology to determine the absorbed dose rate water distribution from electronic brachytherapy (eBT) units is suggested. It involves measuring directly in full scatter tank with small active detectors whose energy response at low X-ray photon energies have been previously characterized. Dose distributions of an INTRABEAM PRS 500 system two configurations — bare needle and spherical applicator 40 mm diameter were measured using Exradin A26 ionization chamber PTW 60019 microDiamond detector. The continuous these terms air kerma 5 keV 70 (eBT range) was available previous calibration several radiation qualities. Here, it converted correction factors obtained Monte Carlo (MC) particle transport simulations. modelled MCNP code. simulated compared measurements refine validate models. A series simulations experimental arrangement detector carried out for determining specific factors. These values are distance-dependent due steep gradient remarkable spectral changes around eBT source water. distance source, radial polar reported manufacturers supplied data. This work effort provide traceability measurement procedures determination 3D as part European joint research project “Primary standards traceable methods emitting devices” (18NRM02 PRISM-eBT).