Which human tissue experiences the most photoelectric absorption events during a radiographic procedure?

Which human tissue experiences the most photoelectric absorption events during a radiographic procedure?

• A. Adipose tissue
• B. Muscular tissue
• C. Lung tissue
• D. Bone tissue

Answer: (D)

Photoelectric absorption is much more likely in materials with higher atomic number and higher density, especially at the lower end of diagnostic X-ray energies. Bone contains mineral with calcium, giving it a higher effective atomic number and greater density than soft tissues or air-filled lungs. This combination makes it far more probable that an incident photon will be completely absorbed (via the photoelectric effect) in bone, rather than in adipose, muscle, or lung tissue, where atoms are lighter and less dense. Soft tissues and the lungs therefore contribute fewer photoelectric events, while bone stands out as the tissue with the most.

Photoelectric absorption is much more likely in materials with higher atomic number and higher density, especially at the lower end of diagnostic X-ray energies. Bone contains mineral with calcium, giving it a higher effective atomic number and greater density than soft tissues or air-filled lungs. This combination makes it far more probable that an incident photon will be completely absorbed (via the photoelectric effect) in bone, rather than in adipose, muscle, or lung tissue, where atoms are lighter and less dense. Soft tissues and the lungs therefore contribute fewer photoelectric events, while bone stands out as the tissue with the most.