RADIATION INTERACTIONS - PART 2

In order to undergo Compton scattering, what must be true of the binding energy of the electron?

• Binding energy does not matter in Compton scattering

• It must be much smaller than the energy of the photon

• Because of resonance, binding energies near the energy of the photon greatly increase probability

• It must be greater than the energy of the photon

Below is the image of a clinical kV x-ray spectrum. What energy was used to generate this spectrum?

• 85 kVp

• Insufficient information

• 150 kVp

• 10 kVp

Order the following shells from least to most allowed electrons. M L N K

• L < M < N < K

• K < L < M < N

• N < M < L < K

• K < L < N < M

The below X-ray spectra were produced by X-ray generators with which common features? A. Filtration level B. Target material C. HVL D. kVp

• A, D

• B, C

• B, D

• A, B, C, D

• D

An electron traveling at 0.8c impacts an electron at rest. What is the maximum possible velocity of the second electron after the collision?

• 3 x 10⁶ m/s

• 2.4 x 10⁸m/s

• 3 x 10⁹ m/s

• 2.4 x 10⁷m/s

How much electric power is required to drive an X-ray tube using a constant 120kV at a current of 80mA?

• 960W

• 9.6kW

• 96W

• 96kW

For equal peak voltage, what type of x-ray generator produces the highest effective voltage?

• Single-phase

• Dual-phase

• Three-phase

• Constant potential

Which electron shell has the highest binding energy?

• L

• M

• K

• N

What statement is true regarding X-ray tubes?

• Electrons travel from the anode to the cathode.

• Electron emission occurs via thermionic emission in the cathode.

• The target is rotated during X-ray production to reduce heel effect.

• The target is heated to increase Bremsstrahlung efficiency.

A photoelectric interaction occurs between a 25keV photon and a k-shell electron with binding energy of 9.2 keV. What is the energy of the characteristic x-ray released?

• Not enough information

• 9.2 keV

• 13.7 keV

• 15.8 keV