Chapter 6

Question 2

What is the purpose of aluminum filtration?

Answer 2

To absorb the less penetrating long wavelengths to reduce radiation exposure.

Question 3

What effect does a less divergent x-ray beam have?

Answer 3

It creates a smaller diameter of exposure.

Question 4

Which option results in the greatest reduction in radiation the patient receives?

Answer 4

Rectangular PIDs

Rectangular PIDs reduce patient radiation dose by 70 percent.

Question 5

Which of the following protects the radiographer from radiation except one?

Answer 5

Wearing a personnel monitoring device.

Question 6

What can a personnel monitoring device not do?

Answer 6

Protect the operator from receiving radiation.

Question 7

Is the best way to reduce patient risk from radiation exposure to follow ALARA principles?

Answer 7

TRUE

Question 8

Have guidelines for deciding when, what type, and how many radiographs to expose been developed?

Answer 8

TRUE

Question 9

Does a rectangular PID expose more radiation to the patient’s face compared with a circular PID?

Answer 9

FALSE

Question 10

Will pure aluminum hinder the passage of high-energy x-rays?

Answer 10

TRUE

Question 11

Does fast film require less radiation for exposure?

Answer 11

TRUE

Question 12

Is increasing the dose of radiation a recommended method to compensate for weak processing solutions?

Answer 12

FALSE

Question 13

Do thermoluminescent dosimeters (TLDs) contain crystals that absorb energy when exposed to radiation?

Answer 13

TRUE

Question 14

What is the maximum permissible dose (MPD) for oral health care professionals?

Answer 14

50 mSv/year.

Question 15

Are medical, dental, and therapeutic radiation included in the MPD?

Answer 15

FALSE

Question 16

Do regulations governing the use of radiation-producing equipment include federal, state, and some local laws?

Answer 16

TRUE

Question 17

Has the United States Nuclear Regulatory Commission developed dose limits for radiographers and patients?

Answer 17

TRUE

Question 18

What principle is called ‘ALARA’?

Answer 18

The principle to keep exposure down, based on the idea that all radiation may cause adverse biological effects.

Question 19

Is the maximum diameter for the intraoral x-ray beam collimated to 3.75 inches at the patient’s skin?

Answer 19

FALSE

Question 20

Should the patient hold the PID stable if the tube head support arm drifts during exposure?

Answer 20

FALSE

Question 21

Is it possible that an undiagnostic radiograph may not need to be retaken if the area of interest is imaged correctly on an adjacent radiograph?

Answer 21

TRUE

Question 22

Should the bisecting technique be the radiographer’s first choice in exposing periapical radiographs?

Answer 22

FALSE

Question 23

How often should an adult recall patient with no risk factors for caries be assessed for bitewing radiographs?

Answer 23

Every 24 to 36 months.

Question 24

How often should a child recall patient with several risk factors for caries be assessed for bitewing radiographs?

Answer 24

Every 6 to 12 months.

Question 25

Does a high level of caries experience increase a patient's risk for future caries?

Answer 25

TRUE

Question 26

Are high-energy x-rays the most harmful to the patient?

Answer 26

FALSE

Question 27

Which intraoral technique should be the radiographer's first choice when exposing periapical radiographs?

Answer 27

Paralleling technique.

Question 28

What undesirable effect does collimation reduce?

Answer 28

Scatter (secondary) radiation.

Question 29

What part of the x-ray machine absorbs long wavelength, less penetrating x-rays?

Answer 29

Filter.

Question 30

What is the term for the sum of inherent and added filtration?

Answer 30

Total filtration.

Question 31

What protects the radiographer against scatter radiation?

Answer 31

Structural shielding.

Question 32

What are the three categories of methods for protecting oral health care personnel from radiation exposure?

Answer 32

Time, distance, and shielding.

Question 33

Why do some dental x-ray machines appear to have a short PID?

Answer 33

The tube is recessed behind the transformers in the tube head.

Question 34

Should the patient wear a thyroid collar during panoramic radiography?

Answer 34

No.

Question 35

What film speed is recommended to reduce radiation exposure?

Answer 35

F speed film.

Question 36

Should image receptor holding devices be recommended to reduce radiation exposure?

Answer 36

Yes.