Experimental and numerical study of dose distribution around a syringe needle-type proton-induced X-ray source for radiotherapy

Abstract

A syringe needle-type proton-induced monochromatic X-ray source was proposed to solve the issue that could occur in practical brachytherapy, such as loss of seed sources and radiation exposure to surgical staff. This paper discusses comparison between experimental results and a Monte Carlo numerical simulation of the dose distribution around the needle. Some simulation results for different source designs are presented as a first step of the design optimization.

Evaluation of the X‐ray distribution of a syringe‐needle type proton‐induced X‐ray source by Geant4 simulation

“…Figure shows the structure of the syringe needle with the metallic target in our previous experiment . One can easily see that it is difficult to measure the beam emittance inside the needle.…”

“…Figure 1 shows the structure of the syringe needle with the metallic target in our previous experiment. [5] One can easily see that it is difficult to measure the beam emittance inside the needle. As a compromise, we measured the beam emittance at a position upstream from the needle and used the data in the simulation program to calculate the transport of proton beams up to the target.…”