Thermomechanical effects caused by heavy ions propagating in tissue

Area of Science:

• Biophysics
• Radiation Biology
• Computational Biology

Background:

• Ionizing radiation deposits energy in tissue, leading to complex physical and chemical events.
• Understanding these events is crucial for radiation therapy and radiation protection.

Purpose of the Study:

• To investigate the thermomechanical effects of ions in biological tissue.
• To determine the role of shock waves in DNA damage and reactive species propagation.

Main Methods:

• Analysis of thermomechanical effects from ion propagation.
• Utilizing molecular dynamics simulations to model shock wave strength and biological impact.

Main Results:

• High energy densities create shock waves whose strength correlates with linear energy transfer (LET).
• Specific shock wave strengths are identified as sufficient to cause direct DNA strand breaks.
• At lower LET, shock waves can efficiently propagate reactive species over distances, outcompeting diffusion.

Conclusions:

• Thermomechanical effects, specifically shock waves, are significant consequences of ion passage through tissue.
• Shock waves play a dual role in radiation-induced biological damage: direct DNA damage and enhanced reactive species dissemination.