RAD PHYSICS [FINAL EXAM STUDY GUIDE] 185 Correct Complete Solutions.

RAD PHYSICS [FINAL EXAM STUDY
GUIDE] 185 Correct Complete Solutions.
RAD PHYSICS [FINAL EXAM STUDY
GUIDE] 185 Correct Complete Solutions.
Excessive anode heating can cause evaporation of tungsten that is deposited on the port window. This
can result in:

1. Decreased tube output

2. Tube failure

3. Electrical arcing - ANSWER 1, 2, and 3

To determine how quickly an x-ray tube will disperse its accumulated heat, the radiographer uses a(n): -
ANSWER Anode cooling curve

Which of the following formulas would a radiographer use to determine the total number of heat units
produced in a given exposure using a single-phase x-ray unit? - ANSWER mA x time x kVp

The half-value layer of an x-ray beam indicates: - ANSWER beam quality

The radiation produced at very discrete energies of approximately 69 keV when electrons interact with
the K-shell of the tungsten target atoms is called? - ANSWER characteristic

When the kVp is increased, x-ray quantity: - ANSWER also increases

How many half-value layers would be required to reduce a beam intensity of 342 mR to 43 mR? -
ANSWER 3

Radiation that passes through the tube housing in the directions other than the useful beam is termed: -
ANSWER Leakage radiation

What is the minimum amount of total filtration required when an x-ray tube is operating at 70 kVp? -
ANSWER 2.5 mm aluminum

What type of device would increase the diagnostic quality of a radiograph of the dorsoplantar projection
of the foot? - ANSWER wedge filter

What combination of exposure factors results in the highest quantity x-ray beam? - ANSWER 96 kVp and
2.5 mm Al filtration

Which of the following transitions would result in production of the highest energy characteristic x-ray?
- ANSWER O shell to K shell

The type(s) of radiation produced in the target is (are):

I. Photoelectric

, RAD PHYSICS [FINAL EXAM STUDY
GUIDE] 185 Correct Complete Solutions.
II. Characteristic

III. Bremsstrahlung - ANSWER II and III

Anode angle will have an effect on the:

1. Severity of the anode heel effect

2. Effective focal spot size

3. Spatial resolution - ANSWER 1, 2, AND 3

Which of the following occurs during bremsstrahlung radiation production? - ANSWER An electron
approaching a positive nuclear charge changes direction and loses energy.

Which of the following constitutes the largest portion of the x-ray beam emerging from the target? -
ANSWER Bremsstrahlung

Which of the following will serve to increase the average energy of the x-ray beam?

1. Increase in added filtration

2. Increase in kilovoltage

3. Increase in milliamperage - ANSWER 1 and 2

Tungsten alloy is the usual choice for the anode target material of radiographic equipment because it:

1. Has a high atomic number

2. Has a high melting point

3. Can readily dissipate heat - ANSWER 1, 2, and 3

What is the advantage of the rotating anode over the stationary anode? - ANSWER Greater heat-loading
capacity

Filters used in x-ray tubes are generally made of: - ANSWER Aluminum

The federal standard for leakage radiation from an x-ray tube housing is: - ANSWER Less than 1mGy/h at
1 meter

When projectile electrons from a filament enters a target atom and interacts with the nuclear force
field, it will: - ANSWER decrease velocity

The area under the x-ray emission spectrum best represents: - ANSWER The total number of photons
emitted

The primary purpose of adding filtration to a diagnostic x-ray beam is to? - ANSWER Remove low energy
photons

Which of the following will affect both the quantity and quality of the primary beam?