Delta-ray production in ion-atom collisions
The stochastic energy concentrations randomly deposited in submicron volumes in and near the paths of charged particles is needed. Computational methods, especially Monte Carlo methods, required a comprehensive set of basic interaction cross sections for the primary and all secondary radiation products. Of particular importance for high LET radiations are the cross sections for the production of energetic secondary electrons, delta-rays, in primary ionizing events. In this paper, we review the present state of available data on the production of delta-rays by fast positive ions in collision with targets of biological interest. The systematics in the cross sections for proton ionization of molecular targets are discussed, indicating what scaling is possible and summarizing what can be concluded regarding the dependence of the mean delta-ray energies on the chemical makeup of the medium. A comparison of typical data is made with the binary-encounter approximation to illustrate the limitations of this theoretical treatment of the ionization process. A bibliography of relevant published works on this topic is included.
- Research Organization:
- Battelle Pacific Northwest Labs., Richland, WA (USA)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 6862134
- Report Number(s):
- PNL-SA-8290; CONF-800944-6; TRN: 81-006459
- Resource Relation:
- Conference: 7. symposium on microdosimetry, Oxford, UK, 8 Sep 1980
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ION BEAMS
ENERGY LOSSES
MICRODOSIMETRY
ION-ATOM COLLISIONS
DELTA RAYS
ION-MOLECULE COLLISIONS
ENERGY SPECTRA
MATHEMATICAL MODELS
MONTE CARLO METHOD
NUMERICAL SOLUTION
SECONDARY EMISSION
STOCHASTIC PROCESSES
ATOM COLLISIONS
BEAMS
COLLISIONS
DOSIMETRY
EMISSION
ION COLLISIONS
LOSSES
MOLECULE COLLISIONS
RADIATIONS
SPECTRA
654001* - Radiation & Shielding Physics- Radiation Physics
Shielding Calculations & Experiments
640301 - Atomic
Molecular & Chemical Physics- Beams & their Reactions