Physics Bucharest 2017

Basic Monte Carlo Steps (Inside LINAC Head)

 Sample energy of photon created by electron  Sample angles  and  between incoming electron and created photon  Select distance to the first interaction  Probability that the photon will travel a distance l without interaction is exp(-  l)  m dl is the probability to interact  Probability to interact between l and l+dl is given by  exp(-  l) dl

l

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  

s 

e     l

lP 

ds e

1

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0

1

1

) ln(      r



l 

r

1

e

l

r

) 1ln(



