Microdosimetric measurements of heavy ion tracks
| Autor: | W. E. Wilson, Leslie A. Braby, N.F. Metting, L.H. Toburen |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Physics
Ions Atmospheric Science Ion track Monte Carlo method Aerospace Engineering Linear energy transfer Astronomy and Astrophysics Radiation Models Theoretical Radiation Dosage Charged particle Ion Geophysics Delta ray Space and Planetary Science Radiation Ionizing General Earth and Planetary Sciences Computer Simulation Linear Energy Transfer Irradiation Atomic physics Radiometry Monte Carlo Method |
| Zdroj: | Advances in space research : the official journal of the Committee on Space Research (COSPAR). 12(2-3) |
| ISSN: | 0273-1177 |
| Popis: | The biological effectiveness of radiations depends on the spatial pattern of ionizations and excitations produced by the charged particle tracks involved. Ionizations produced by both the primary ion and by energetic delta rays may contribute to the production of biologically relevant damage and to the concentration of damage which may effect the probability of repair. Although average energy concentration (dose) can be calculated using homogeneous track models, the energy is actually concentrated in small volumes containing segments of the ion and delta ray tracks. These local concentrations are studied experimentally using low pressure proportional counters, and theoretically, using Monte Carlo methods. Small volumes near an ion track may be traversed by a delta ray. If they are, the energy deposited will be similar to that produced by a single electron track in a low-energy x-ray irradiation. The probability of a delta ray interaction occurring decreases with the square of the radial distance from the track. The average energy deposited is the product of this probability and the energy deposited in an interaction. Average energy deposited calculated from measured interaction probability is in good agreement with the results of homogeneous track models. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|