Radiotherapy Flashcards
Max no of e
2n square
Isotopes
Same atomic number
Different atomic mass
Photoelectric effect
Low energy interaction
Interaction with bound e and with innermost shell
Complete transfer of energy
Used in diagnostic radiation
Compton effect
High energy interaction
Interaction with outer most shell
Incomplete transfer of energy
Used in scatter radiation
Teletherapy
Cld external beam therapy
Machine cld cyclotron where cobalt 60 and caesium 137 emits gamma rays
Now X-ray tube used cld LINAC
SO rays used now x rays and beta rays (cathode rays)
Linac
Beta rays - superficial CA so skin tumors and in intraoperstive RT In pancreatic and Brest CA
X rays and gamma rays - for deep CA
X-rays cld cyber knife tt
Gamma rays cld gamma knife tt