The discussion centers around the Bragg-Gray theory and its application in radiophysics, specifically regarding the calculation of dose in water using the Bragg-Gray cavity and the concept of electronic equilibrium. Participants explore the relationship between these calculations at different energy levels, particularly at 45 MV.
Participants do not reach a consensus, as there are differing interpretations of the implications of charged particle equilibrium and its effects on dose calculations at varying energy levels.
There are limitations regarding the assumptions made in the application of the Bragg-Gray theory and the conditions under which charged particle equilibrium is considered. The discussion does not resolve these complexities.
Yes, sorry, Bragg- Gray. I mean (as exercise) I calculate the dose in water for 45 MV by Bragg-Gray cavity and by the equation for electronic equilibrium (i do not know its proper name) and I obtained similar values. My question is: Why? I thought that i must obtain very diferent values.gleem said:Your mean Bragg-Gray don't you? Could you please elaborate on your issue? Your question does not make sense as stated,
Well I found the answer. It seems that the charged particle equilibrium it is not a restrictive condition; particulary at low energies is less restrictive than at high energies.gleem said:Bragg Gray Theory assumes that charged particle equilibrium exists at the position of a small cavity in a medium , that the ionization produced in the cavity is proportional to the absorbed dose and that the cavity does not significantly change the spectral characteristics of the ionizing radiation at the cavity position.