Radiologic Technologist Practice Exam

What is another term for classical scattering?

1. Compton

2. Coherent

3. Characteristic

4. Photoelectric

The correct answer is: Coherent

Coherent scattering, also known as classical scattering, occurs when low-energy photons interact with matter, resulting in a change in direction of the photons without a loss of energy. This process typically happens in the context of interactions with atoms, where the incident photon induces a temporary state in the electron cloud of the atom, leading to the emission of radiation of the same energy as the incident photon. This is in contrast to other interactions such as Compton scattering, where energy is transferred between the photon and an outer shell electron, resulting in both a change in energy and direction of the photon. Understanding coherent scattering is essential for radiologic technologists as it helps in comprehending how different types of radiation interact with tissues and the implications for imaging and radiation safety. The identification of coherent scattering is particularly important in the context of techniques such as ultrasound and in understanding the behaviors of scattered photons in diagnostic imaging modalities. Thus, "coherent" serves as the appropriate alternate term for classical scattering, reflecting the unchanged energy aspect of the incident photons during the interaction.