Safety Flashcards
Which of the following reduces the amount of scatter radiation fog on a radiograph? 1. Decrease in kVp 2. Decrease in field size 3. Decrease in grid ratio
1 and 2
The frequency of a sine wave is measured by the?
number of times per second that the crest passes a given point
Compton scatter occurs when an x-ray photon interacts with which part of the atom in the patients body?
Outer orbital electron
The photoelectric effect occurs when an incoming photon from the primary beam interacts with which part of the atom in the patients body?
Inner shell electron
The factors that affect x-ray quality are? 1. kilovoltage 2. filtration 3. mAs
1 and 2
What are the four primary aspects that directly affect how the x-ray image looks?
Density, distortion, contrast, and spatial resolution
As kVp increases, Compton interactions will?
Increase
Which of the following are the prime factors of exposure in radiography?
Milliamperage, exposure time, kilovoltage, and SID
Scatter radiation fog will? 1. Increase density 2. decrease contrast 3. reduce the visibility of detail
1,2 and 3
Patient doses in radiography are usually calculated as the?
entrance skin exposure (ESE)
The precise area on the target where the x-rays strike is called the?
focal spot
What type of radiation is produced when an incoming electron interacts with the k-shell electron in the tungsten atom?
Characteristic
The unit of potential difference is?
volt
All electromagnetic energy moves through space at the same?
velocity
When an image demonstrates many densities, and there is little difference between the densities, the image is described as having?
long-scale contrast
The degree of angulation of the x-ray tube target will determine the
effective focal spot
The SI unit for absorbed dose is the?
gray (Gy-t)
Which quality factor is a key to visibility of detail?
contrast
Which of the following transformers would have more windings on the primary side
step- down transformer
The annual effective dose limit for an occupational radiation worker is?
50 mSv
Contrast is influenced by 1. SID 2. fog 3. collimation
2 and 3
How does scatter radiation fog reduce the visibility of detail in a radiographic image?
by decreasing contrast
When an image demonstrates great differences between the densities, the image is described as?
high contrast
During a photoelectric effect, an incoming photon interacts with the atom in the patient’s body. What happens to the photon with this effect?
It is totally absorbed by the atom
