Theory Cavities

Question 1

Brag gray explain the theory

Answer 1

Ratio of stopping power to measure the dose in a small cavity and relate to the general medium we want to know the dose.

Question 2

Explain. The spencer-attix theory

Answer 2

Addition to the B-G theory, it is for big cavities, it takes into account the attenuation of secondary radiation. Using fluence and attenuation coefficient

Question 3

Burlin theory

Answer 3

Berlin theory : bridge between Spencer Attix and Bragg-gray, using a parameter d, where d =0 is a big cavity, and d=1 is a small cavity

Question 4

Fano theorem

Answer 4

Fano for neutron & proton of less than 1 MeV
A uniform field of indirectly ionizing will give a uniform field of secondary radiation.