practice test #3 long

The main purpose of using a lead apron with a thyroid collar when exposing dental radiographs is to protect the patient from

hazardous materials.

scatter radiation.

the primary beam.

infectious agents.

scatter radiation.

Which of the following was established to address the education and certification of operators of radiographic equipment?

Radiation Control for Health and Safety

National Council on Radiation Protection and Measurements

International Commission on Radiation Units and Measurements

Consumer-Patient Radiation Health and Safety Act

Consumer-Patient Radiation Health and Safety Act

Personnel radiation monitoring devices are worn to

record the occupational exposure received by the operator.

alert the patient when an exposure occurs.

record the background exposure received by the patient.

alert the operator when an exposure occurs.

record the occupational exposure received by the operator.

What is the name of the process for the harmful effects of radiation?

ultraviolet rays

ionization

infrared rays

radiation

ionization

The most common artificial radiation exposure comes from

the nuclear fuel cycle.

medical radiation.

consumer products.

atomic weapon fallout.

medical radiation.

Which of the following can help to protect patients from excess radiation damage to tissues?

Round collimation

digital radiopgraphy

High kVp

Short cone paralleling

High kVp

Which of the following would you adjust to produce wavelengths with the greatest penetrating power?

Time

kVp

Distance

mA

kVp

The diameter of the cone-shaped beam produced from a circular collimator is

1.50 inches.

1.75 inches.

2.5 inches.

2.75 inches.

2.75 inches.

Which of the following is a long term effect of radiation?

Genetic

The radiation that is formed by the interaction of x-rays with matter is

primary radiation.

scattered radiation.

secondary radiation.

Bremsstrahlung radiation.

secondary radiation.

The purpose of the aluminum disc in the x-ray tubehead is to

prevent distortion on the radiograph.

filter out long wave x-rays from the primary beam.

prevent scatter radiation.

filter out short wave x-rays from the primary beam.

filter out long wave x-rays from the primary beam

The position-indicating device (PID) shape that most effectively reduces patient exposure to radiation is

round.

rectangular.

conical.

oblong.

rectangular

When exposing radiographs, what is the minimum distance the operator should stand from the tube head?

2 feet

4 feet

6 feet

8 feet

6 ft

Using the ALARA concept as a guideline for radiographs includes all of the following EXCEPT

draping the patient with a thyroid collar.

using a circular PID.

draping the patient with a lead apron.

using a rectangular PID.

using a circular PID.

If a dental assistant dosimeter badge report indicates exposure to radiation, what should be done first?

Evaluate the x-ray equipment and techniques

Change the mA and kVp or exposure time

Consult a physician

repeat the badge test

Evaluate the x-ray equipment and techniques

Leakage radiation is defined as any radiation that is

received from the patient.

received from the operator.

from the primary beam.

from the secondary beam.

from the primary beam.

While exposing digital images, radiation deflecting off the patient's head is called

characteristic radiation.

primary radiation.

background radiation.

scatter radiation.

scatter radiation

Which of the following affects the speed of the electrons emitted from the tubehead?

Filtration

Impulses

kVp

mA

kVp

When taking radiographs on a small child who cannot hold the sensor intra-orally, the dental assistant should;

ask a parent or guardian to hold the sensor.

position and hold the sensor.

reschedule the radiographic series.

ask the dentist to hold the sensor.

ask a parent or guardian to hold the sensor.

The amount of which of the following is used in determining the degree of radiation injury?

Genetic effects observed

Alpha particles present

Tissue irradiated

Free radicals present

Tissue irradiated