Radiotherapy Flashcards

1
Q

Max no of e

A

2n square

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2
Q

Isotopes

A

Same atomic number

Different atomic mass

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3
Q

Photoelectric effect

A

Low energy interaction
Interaction with bound e and with innermost shell
Complete transfer of energy
Used in diagnostic radiation

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4
Q

Compton effect

A

High energy interaction
Interaction with outer most shell
Incomplete transfer of energy
Used in scatter radiation

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5
Q

Teletherapy

A

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)

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6
Q

Linac

A

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

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