LRA 225 Core Assessment

As the distance increases, the beam quantity reaching a specific area

Decreases

X-rays are produced by

characteristic and bremsstrahlung interactions

The primary source of radiation exposure to the radiographer who is in the room during an exposure is

from scatter from the patient.

Which of the following is the primary factor controlling quantity?

mAs

Photoelectric interactions

contribute significantly to patient dose.

A filament electron removes a K shell electron and an M shell electron fills the vacancy. The K shell binding energy is 69.5 keV and the M shell binding energy is 2.8 keV. What is the energy of the K-characteristic photon produced?

66.7 keV

The fog seen on the radiographic image is the result of

Compton interactions.

Secondary photons produced during a Compton interaction

contribute to patient dose

Bremsstrahlung means

Braking radiation

To minimize occupational exposure, the technologist should

wear protective apparel (lead aprons, gloves, etc.) when in the room during imaging.

Classical interactions are also known as

Thomson and coherent scattering.

Radiation interacting with air is more likely to be _____________, resulting in that area of the image being darker.

transmitted

When filament electrons enter the anode target, they interact with

outer shell electrons of tungsten atoms.

When it does interact with the image receptor, the Compton scatter photon contributes no useful information bec

it has changed direction

The energy of the brems photon depends on

all of these.

With Compton scattering, the incident photon

loses up to one third of its energy

When a filament electron knocks out a K shell electron from the tungsten atom, it leads to

a characteristic x-ray photon.

The majority of the x-ray photons produced are

brems photons.

Coherent scattering involves

an x-ray photon with low energy.

The energy of the characteristic x-ray photon depends on

all of these