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US 6,285,969 B1Granted
Use of single scatter electron monte carlo transport for medical radiation sciences
AssigneeThe Regents of the University of California
InventorMichelle M. Svatos
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Abstract
The single scatter Monte Carlo code CREEP models precise microscopic interactions of electrons with matter to enhance physical understanding of radiation sciences. It is designed to simulate electrons in any medium, including materials important for biological studies. It simulates each interaction individually by sampling from a library which contains accurate information over a broad range of energies.
Claims2
A method for modeling precise analog microscopic interactions of electrons with matter, comprising:
- finding the distance to interaction by finding the total cross section at the present energy and using the relation s=−λ1n(η) , where η is a random number on the interval (0,1);
- determining which type of atom in the material the interaction involved, knowing the ratio of chemical elements that comprise the material;
- determining which interaction took place, by forming and sampling from a cumulative probability based on the LLNL Evaluated Electron Data Library doubly differential cross sections for each of the four possible interactions (ionization, excitation, elastic scatter, bremsstrahlung);
- updating the energy, position and trajectory of the particle to reflect the chosen interaction;
- and
- repeating the above steps until the electron has escaped the medium or fallen below the energy cutoff.
3 more elements
Dependencies are inferred from the claim text.