Experimental determination of Gd dose enhancement and Gd dose sparing by 192Ir brachytherapy source with Gafchromic EBT3 dosimeter

Santibáñez, M.; Fuentealba, M.

doi:10.1016/j.apradiso.2021.109787

Cited by 3 publications

(1 citation statement)

References 26 publications

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“…On the other hand, experimental quantification still presents important challenges, the main difficulty being the ability to record the contribution of low-energy photoelectrons and Auger electrons, which do not manage to pass through the walls that cover traditional dosimeters and be recorded by the radiosensitive region. Dose enhancement measurements obtained through Gafchromic model EBT2 and EBT3 radiochromic films (specially designed for “External Beam Therapy (EBT)” and commercially known as EBT2 and EBT3 films) have already been reported some years ago [ 39 , 40 , 41 , 42 , 43 ]. The EBT3 film possesses a 30

m radiosensitive substrate placed between two 125

m transparent polyester films, barriers not penetrable by electrons with energies <90 keV, making it difficult to directly measure the DEF for energy beams close to the Gd absorption edge.…”

Section: Introductionmentioning

confidence: 99%

An Optimized Method for Evaluating the Potential Gd-Nanoparticle Dose Enhancement Produced by Electronic Brachytherapy

Fuentealba,

Ferreira,

Salgado

et al. 2024

Nanomaterials

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This work reports an optimized method to experimentally quantify the Gd-nanoparticle dose enhancement generated by electronic brachytherapy. The dose enhancement was evaluated considering energy beams of 50 kVp and 70 kVp, determining the Gd-nanoparticle concentration ranges that would optimize the process for each energy. The evaluation was performed using delaminated radiochromic films and a Poly(methyl methacrylate) (PMMA) phantom covered on one side by a thin 2.5 μm Mylar filter acting as an interface between the region with Gd suspension and the radiosensitive film substrate. The results for the 70 kVp beam quality showed dose increments of 6±6%, 22±7%, and 9±7% at different concentrations of 10, 20, and 30 mg/mL, respectively, verifying the competitive mechanisms of enhancement and attenuation. For the 50 kVp beam quality, no increase in dose was recorded for the concentrations studied, indicating that the major contribution to enhancement is from the K-edge interaction. In order to separate the contributions of attenuation and enhancement to the total dose, measurements were replicated with a 12 μm Mylar filter, obtaining a dose enhancement attributable to the K-edge of 29±7% and 34±7% at 20 and 30 mg/mL, respectively, evidencing a significant additional dose proportional to the Gd concentration.

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m radiosensitive substrate placed between two 125

m transparent polyester films, barriers not penetrable by electrons with energies <90 keV, making it difficult to directly measure the DEF for energy beams close to the Gd absorption edge.…”

Section: Introductionmentioning

confidence: 99%