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Dose and DNA damage modelling of diffusing alpha-emitters radiation therapy using Geant4
Laura Ballisat1, Chiara De Sio1, Lana Beck1
1School of Physics, University of Bristol, Bristol, UK.
Summary
Diffusing alpha-emitters radiation therapy (DaRT) uses alpha particles for cancer treatment. Simulations show beta particles become the main dose source beyond 4mm, influencing optimal seed spacing for effective treatment.
Area of Science:
- Medical Physics
- Radiation Oncology
- Nuclear Medicine
Background:
- Diffusing alpha-emitters radiation therapy (DaRT) is an advanced brachytherapy technique.
- It utilizes alpha particles for targeted solid tumor treatment.
- High linear energy transfer (LET) and short range of alpha particles offer precise cancer therapy.
Purpose of the Study:
- To simulate a DaRT seed using Geant4 Monte Carlo toolkit.
- To understand dose contributions from all particles in the 224Ra decay chain.
- To simulate DNA damage resulting from DaRT.
Main Methods:
- Geant4 Monte Carlo toolkit simulation.
- Analysis of dose contribution from alpha, beta, and other particles.
- Estimation of Relative Biological Effectiveness (RBE) based on DNA double-strand breaks (DSBs).
Main Results:
- Alpha particles dominate dose near the seed; beta particles dominate beyond 4mm.
- Maximum seed spacings of 5.5 mm and 6.5 mm determined for 20 Gy RBE-weighted dose.
- DNA damage complexity decreases with radial distance from the seed.
Conclusions:
- Alpha particles are primary dose contributors near the seed.
- Non-alpha particle contributions are significant and impact seed spacing.
- DNA damage complexity varies with distance, potentially affecting cellular repair.
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