Question: 1 . [ 8 marks ] What is the approximate ratio of the radiation to the collision energy loss of 2 0 MeV electrons in

1.[8 marks] What is the approximate ratio of the radiation to the collision energy loss of 20 MeV electrons in a gold X -ray target \((\mathrm{Z}=79\)) used for radiation therapy? Compare this ratio with the value of the ratio of 0.1 MeV electrons striking a tungsten tube \((Z=74)\) in a diagnostic \( X \)-ray tube.
1 . [ 8 marks ] What is the approximate ratio of

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