An investigation into a novel in-vivo PMMA (polymethyl
methacrylate) plastic fiber-optic dosimeter for monitoring low doses of
ionizing radiotherapy radiation in real time and for integrating
measurements is presented. The fabricated optical fiber tip possessed an
embedded structure. A scintillation material, terbium-doped gadolinium
oxysulfide (Gd2O2S:Tb), capable of emitting visible light at around 545 nm
which is ideal for transmission through the PMMA when exposed to
ionizing radiation was embedded in the PMMA plastic fiber. The dose rate
of incident ionizing radiation is measured by analyzing the signal intensity
emitted from the scintillation material which propagates through the fiber to
a distal MPPC (multi-pixel photon counter). The dosimeter exhibits good
repeatability with an excellent linear relationship between the fiber-optic
dosimeter output and the absorbed radiation dose with an outstanding
isotropic response in its radial angular dependence.
History
Publication
Optics Express;24 (5)
Publisher
Optical Society of America
Note
peer-reviewed
Other Funding information
International Science & Technology Cooperation Program of China, National Natural Science Foundation of China