Chapter 03: Radiation Characteristics

Chapter 03: Radiation Characteristics

 

Complete Chapter Questions With Answers

 

Sample Questions Are Posted Below

 

MULTIPLE CHOICE

 

1. In dental radiography, the term ________ is used to describe the mean energy or penetrating ability of the x-ray beam.

a.	quality
b.	quantity
c.	intensity
d.	wavelength

 

 

ANS:  A

Quality is used to describe the mean energy or penetrating ability of the x-ray beam. Quantity refers to the number of x-rays produced. Intensity is defined as the product of the quantity and quality per unit of area per time of exposure. Wavelength determines the energy and penetrating power of radiation.

 

DIF:    Recall             REF:   Page 24          OBJ:   1

TOP:   CDA, RHS, III.B.1. Demonstrate knowledge of the factors affecting x-ray production

MSC:  NBDHE, 2.0 Obtaining and Interpreting Radiographs | NBDHE, 2.1 Principles of radiophysics and radiobiology

 

2. Which of the following statements is true of wavelength in reference to radiation?

a.	X-rays with shorter wavelength have less penetrating power.
b.	X-rays with longer wavelength have less penetrating power.
c.	X-rays with longer wavelength are less likely to be absorbed by matter.
d.	Milliamperage controls the wavelength and energy of the x-ray beam.

 

 

ANS:  B

X-rays with longer wavelength have less penetrating power and x-rays with shorter wavelengths have more penetrating power. X-rays with longer wavelength are more likely to be absorbed by matter. Kilovoltage controls the wavelength and energy of the x-ray beam.

 

DIF:    Recall             REF:   Page 24          OBJ:   2

TOP:   CDA, RHS, III.B. Apply the principles of radiation protection and hazards in the operation of radiographic equipment

MSC:  NBDHE, 2.0 Obtaining and Interpreting Radiographs | NBDHE, 2.1 Principles of radiophysics and radiobiology

 

3. ______________ is a measurement of force that refers to the potential difference between two electrical charges.

a.	Exposure time
b.	Wavelength
c.	Voltage
d.	Ampere

 

 

ANS:  C

Exposure time refers to the interval of time during which x-rays are produced. Wavelength can be defined as the distance between the crest of one wave and the crest of the next wave. Voltage is a measurement of force that refers to the potential difference between two electrical charges. Ampere is the unit of measure used to describe the number of electrons, or current, flowing through the cathode filament.

 

DIF:    Recall             REF:   Pages 3-4       OBJ:   1

TOP:   CDA, RHS, I.B.1. Describe how to acquire radiographic images using various techniques | CDA, RHS, III.B. Apply the principles of radiation protection and hazards in the operation of radiographic equipment

MSC:  NBDHE, 2.0 Obtaining and Interpreting Radiographs | NBDHE, 2.1 Principles of radiophysics and radiobiology

 

4. When the kilovoltage is increased

a.	electrons move from the anode to the cathode with more speed.
b.	photons move from the anode to the cathode with more speed.
c.	electrons move from the cathode to the anode with more speed.
d.	photons move from the cathode to the anode with more speed.

 

 

ANS:  C

Electrons move from the cathode to the anode. When the voltage is increased, electrons move from the cathode to the anode with more speed, striking the target with greater energy and force.

 

DIF:    Comprehension                               REF:   Page 24          OBJ:   2

TOP:   CDA, RHS, I.B.1. Describe how to acquire radiographic images using various techniques | CDA, RHS, III.B. Apply the principles of radiation protection and hazards in the operation of radiographic equipment

MSC:  NBDHE, 2.0 Obtaining and Interpreting Radiographs | NBDHE, 2.1 Principles of radiophysics and radiobiology