1. Explain why attenuation of lower-energy photons is greater than higher-energy photons. 2. Explain how a small lead collimator reduces off-focal radiation. 3. Explain the concept of beam filtration or beam hardening. 4. Define the following characteristics of the output of an X-Ray system: Quality,

1. Explain why attenuation of lower-energy photons is greater than higher-energy photons. 2. Explain how a small lead collimator reduces off-focal radiation. 3. Explain the concept of beam filtration or beam hardening. 4. Define the following characteristics of the output of an X-Ray system:  Quality, Quantity, Exposure, and Production Efficiency. 5. Explain the following equation: 5. Explain the following equation: