Simulation of DSB yield for high LET radiation.

Area of Science:

• Radiation Biology
• Biophysics
• Computational Biology

Background:

• DNA double-strand breaks (DSB) are critical lesions induced by ionizing radiation.
• Understanding DSB formation mechanisms is essential for radiation protection and therapy.
• Linear energy transfer (LET) is a key parameter influencing radiation-induced DNA damage.

Purpose of the Study:

• To develop and present a simulation approach for calculating LET-dependent DSB yield.
• To model DSB formation considering both intra-track and inter-track electron processes.
• To integrate this model into the Local Effect Model for estimating relative biological effectiveness (RBE).

Main Methods:

• A simulation approach based on Monte Carlo algorithms.
• An analytical formula for DSB yield calculation.
• Modeling DSB as two closely spaced single-strand breaks (SSB).

Main Results:

• The simulation approach successfully calculates LET-dependent DSB yield.
• DSB yield is predicted to be enhanced for high LET charged particle irradiation compared to X-rays or gamma rays.
• The model accounts for intra-track and inter-track electron processes contributing to DSB formation.

Conclusions:

• The presented simulation model provides a robust method for predicting DSB yields under varying LET conditions.
• High LET radiation leads to a higher yield of DSB compared to low LET radiation.
• This approach is integral to the Local Effect Model for accurate RBE estimations of high LET radiation.