Answer Happy

The ratio of Compton interactions in one gram of hydrogen to one gram of water is approximately: 2:1 1:1 1:2 1:3 3:1 O depends on the energy strongly Clear my choice
The purpose of the collimator is to: define the beam and determine the dose rate determine the dose rate define and flatten the beam define the beam flattens the beam at a specified depth in tissue determine the dose rate and flatten the beam Clear my choice
Atomic number 80 70 60 50 40 30 20 10 Photoeffect dominant 0 Pair production dominant Compton effect dominant 0.01 0.05 0.1 0.5 1 Photon energy (MeV) Energies larger than 0.3 MeV and less than 5 MeV All energies less than 5 MeV O Energies larger than 0.1 MeV and less than 10 MeV All energies less than 10 MeV Exactly equals 0.3 MeV All energies larger than 0.3 MeV Clear my choice 5 10 50 100
The HVL of Co-60 is about 9 mm of lead. What is the approximate transmission factor for a 1.8 cm lead block? (Transmission factor is the percentage of the un-attenuated intensity to the original intensity) 72.5% 50% 32.25% 12.5% 6.25% 25% Clear my choice
The number of primary and secondary ion pairs produced per unit length of an incident electron" is the definition of: Linear ionization Specific excitation Stopping power Linear energy transfer Specific ionization 4 ↑↓