| Zugriffsnummer | 10135 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Physics of electron and photon transport for dosimetry calculations |
| Autor(in); Institution |
Großwendt, Bernd; 6.6, Grundlagen der Dosimetrie, PTB-Braunschweig
|
| Quelle/Jahr | Computing radiation dosimetry - CRD 2002 : workshop proceedings, Sacavém, Portugal, 22 - 23 June 2002:(2004), 37 - 56 |
| Herausgeber(in) |
Nuclear Energy Agency, OECD
|
| ISBN | 92-64-10823-8 |
| Berichtsnummer | NEA 4311 |
| Verlag | Paris: OECD Publications |
| Konferenzangaben | Workshop on Computing Radiation Dosimetry, Sacavém, Lissabon, 22-23, June, 2002, Portugal |
| Freie Schlagworte | Physics of electron and photon transport ; Monte Carlo method ; Electron and photon dosimetry ; Low-energy electrons |
| Zusammenfassung | The main objective of the physics of particle transport in the fields of radiation protection and of radiation dosimetry for therapy purposes is the determination of the spatial distribution of energy deposition in the human body while exposing it to external ionizing radiation. The central physical quantity to be used for this purpose is the absorbed dose to soft tissue or water. Since the direct measurement of absorbed dose distributions within a patient's body is neither directly possible nor reasonable, it must be replaced by measuring procedures in phantoms and by recipes which are well suited to deduce the desired dose distributions. To justify such measuring procedures and recipes, sophisticated Monte Carlo simulations based on interaction cross sections and particle transport theories are commonly used. The first part of the talk analyses the effort needed to simulate the penetration of photons and high-energy electrons through matter, and summarizes the basic physical principles of electron or photon transport models. In a second part, these principles are applied to study a few general aspects of electron or photon histories in water. Here, special emphasis is laid on the depth dependence of spectral electron distributions in primary photon or electron fields and on the range of high-energy electrons as a function of their initial energy. In a final section, the role of low-energy electrons is shortly discussed from the point of view of radiation damage and compared with that of photons and light ions. |
