Question 1

The time lapse from x-ray exposure until noticeable damage occurs is known as:

Accepted Answer

A) the latent period. 
B) chronic exposure. 
C) the cumulative period. 
D) none of the above. 
A) the latent period. 
B) chronic exposure. 
C) the cumulative period. 
D) none of the above.

Question 2

Dental imaging:

Accepted Answer

A) refers to film-based images. 
B) refers to digitally produced images. 
C) detects conditions that might otherwise remain undetected. 
D) all of the above. 
A) refers to film-based images. 
B) refers to digitally produced images. 
C) detects conditions that might otherwise remain undetected. 
D) all of the above.

Question 3

Damage caused by ionizing x-radiation to genetic cells:

Accepted Answer

A) affects only the person being x-rayed. 
B) can affect future generations. 
C) affects only the dental assistant. 
D) affects the cells of the eye, skin, and oral mucosa. 
A) affects only the person being x-rayed. 
B) can affect future generations. 
C) affects only the dental assistant. 
D) affects the cells of the eye, skin, and oral mucosa.

Question 4

Which of the following is an example of cumulative radiation exposure?

Accepted Answer

A) Cataracts 
B) Leukemia 
C) Cancer 
D) All of the above 
A) Cataracts 
B) Leukemia 
C) Cancer 
D) All of the above

Question 5

Which council determines the radiation effects and levels tolerable for humans?

Accepted Answer

A) American Dental Association (Council on Radiation Safety) 
B) American Dental Association (Council on Dental Materials) 
C) National Council on Radiation Protection and Measurements 
D) All of these groups make recommendations. 
A) American Dental Association (Council on Radiation Safety) 
B) American Dental Association (Council on Dental Materials) 
C) National Council on Radiation Protection and Measurements 
D) All of these groups make recommendations.

Question 6

The location where x-rays are produced in the x-ray tube is called the:

Accepted Answer

A) focal spot. 
B) filament. 
C) window. 
D) PID. 
A) focal spot. 
B) filament. 
C) window. 
D) PID.

Question 7

The fuzzy or blurred area around an image is called the ____.It can be reduced by ____.

Accepted Answer

A) distortion; limiting movement 
B) penumbra; limiting movement 
C) distortion; using fast film 
D) penumbra; using fast film 
A) distortion; limiting movement 
B) penumbra; limiting movement 
C) distortion; using fast film 
D) penumbra; using fast film

Question 8

_____ will improve the sharpness of a radiographic image.

Accepted Answer

A) A larger focal spot size 
B) Faster film 
C) Smaller film crystal size 
D) Movement of the patient 
A) A larger focal spot size 
B) Faster film 
C) Smaller film crystal size 
D) Movement of the patient

Question 9

Which component of the x-ray machine functions in positioning the tubehead?

Accepted Answer

A) Kilovoltage selector 
B) Control panel 
C) Extension arm 
D) Cathode 
A) Kilovoltage selector 
B) Control panel 
C) Extension arm 
D) Cathode

Question 10

The uses of dental images include the detection of:

Accepted Answer

A) incipient occlusal lesions. 
B) periodontal probing depths. 
C) bone loss in its early stages. 
D) percussion sensitivity as part of endodontic evaluation. 
A) incipient occlusal lesions. 
B) periodontal probing depths. 
C) bone loss in its early stages. 
D) percussion sensitivity as part of endodontic evaluation.

Question 11

The _____ setting controls the penetrating power of the x-ray beam.

Accepted Answer

A) impulse timer 
B) kilovolt setting 
C) milliamp setting 
D) all of the above 
A) impulse timer 
B) kilovolt setting 
C) milliamp setting 
D) all of the above

Question 12

Because the entire x-ray area is considered a radiation hazard area,a radiation hazard sign must be posted in:

Accepted Answer

A) sight of patients. 
B) sight of personnel. 
C) the doctor's private office. 
D)  both a and b. 
A) sight of patients. 
B) sight of personnel. 
C) the doctor's private office. 
D)  both a and b.

Question 13

Thermionic emission refers to the:

Accepted Answer

A) release of electrons from the tungsten filament. 
B) ions formed in the x-ray tube by the loss of electrons. 
C) change in filament resistance due to heating. 
D) slamming of electrons against the target. 
A) release of electrons from the tungsten filament. 
B) ions formed in the x-ray tube by the loss of electrons. 
C) change in filament resistance due to heating. 
D) slamming of electrons against the target.

Question 14

A(n) _____ is a minute bundle of energy that has no weight or mass.

Accepted Answer

A) ion 
B) atom 
C) photon 
D) electron 
A) ion 
B) atom 
C) photon 
D) electron

Question 15

The maximum permissible dose for an occupational worker for an individual 18 years old or over is ___ rems per year:

Accepted Answer

A) 3 
B) 5 
C) 1.25 
D) 0.3 
A) 3 
B) 5 
C) 1.25 
D) 0.3

Question 16

One of the rules of radiation protection is to never stand closer than _____ feet from the x-ray unit during an exposure unless you are behind a barrier.

Accepted Answer

A) 2 
B) 6 
C) 10 
D) 15 
A) 2 
B) 6 
C) 10 
D) 15

Question 17

The range of shades of gray between black and white on an image is called:

Accepted Answer

A) contrast. 
B) density. 
C) sharpness. 
D) focus point. 
A) contrast. 
B) density. 
C) sharpness. 
D) focus point.

Question 18

Damage to which type of cell is passed on to future generations?

Accepted Answer

A) Somatic cell 
B) Genetic cell 
C) Damage to either somatic cells or genetic cells is passed on to future generations 
D) Damage to neither somatic cells nor genetic cells is passed on to future generations 
A) Somatic cell 
B) Genetic cell 
C) Damage to either somatic cells or genetic cells is passed on to future generations 
D) Damage to neither somatic cells nor genetic cells is passed on to future generations

Exam 38: Foundations of Radiography, Radiographic Equipment, and Radiation Safety

The time lapse from x-ray exposure until noticeable damage occurs is known as:

Dental imaging:

Damage caused by ionizing x-radiation to genetic cells:

Which of the following is an example of cumulative radiation exposure?

Which council determines the radiation effects and levels tolerable for humans?

The location where x-rays are produced in the x-ray tube is called the:

The fuzzy or blurred area around an image is called the ____.It can be reduced by ____.

_____ will improve the sharpness of a radiographic image.

Which component of the x-ray machine functions in positioning the tubehead?

The uses of dental images include the detection of:

The _____ setting controls the penetrating power of the x-ray beam.

Because the entire x-ray area is considered a radiation hazard area,a radiation hazard sign must be posted in:

Thermionic emission refers to the:

A(n) _____ is a minute bundle of energy that has no weight or mass.

The maximum permissible dose for an occupational worker for an individual 18 years old or over is ___ rems per year:

One of the rules of radiation protection is to never stand closer than _____ feet from the x-ray unit during an exposure unless you are behind a barrier.

The range of shades of gray between black and white on an image is called:

Damage to which type of cell is passed on to future generations?

History of Dentistry

The Professional Dental Assistant

The Dental Healthcare Team

Dental Ethics

Dentistry and the Law

General Anatomy

General Physiology

Oral Embryology and Histology

Head and Neck Anatomy

Landmarks of the Face and Oral Cavity

Overview of the Dentitions

Tooth Morphology

Dental Caries

Periodontal Disease

Preventive Dentistry

Nutrition

Oral Pathology

Microbiology

Disease Transmission and Infection Prevention

Principles and Techniques of Disinfection

Principles and Techniques of Instrument Processing and Sterilization

Regulatory and Advisory Agencies

Chemical and Waste Management

Dental Unit Waterlines

Ergonomics

The Patient Record

Vital Signs

Oral Diagnosis and Treatment Planning

The Special Needs and Medically Compromised Patient

Principles of Pharmacology

Assisting in a Medical Emergency

The Dental Office

Delivering Dental Care

Dental Hand Instruments

Dental Handpieces and Accessories

Moisture Control

Anesthesia and Pain Control

Digital Imaging, Dental Film, and Processing Radiographs

Legal Issues, Quality Assurance, and Infection Prevention

Intraoral Imaging

Extraoral Imaging

Restorative and Esthetic Dental Materials

Dental Liners, Bases, and Bonding Systems

Dental Cements

Impression Materials

Laboratory Materials and Procedures

General Dentistry

Matrix Systems for Restorative Dentistry

Fixed Prosthodontics

Provisional Coverage

Removable Prosthodontics

Dental Implants

Endodontics

Periodontics

Oral and Maxillofacial Surgery

Pediatric Dentistry

Coronal Polishing

Dental Sealants

Orthodontics

Communication in the Dental Office

Business Operating Systems

The fuzzy or blurred area around an image is called the .It can be reduced by .