Dental Radiation Safety Exam Questions

What does PID refer to?

Position Indicator Device- cylinder or cone part of xray machine aligned with the film during exposure

Density refers to

Overall blackness of the film

Periapical image allows the following images to be visualized

Crown, Root, supporting tissue for the tooth

Bitewing image allows the following images to be visualized

Crown, proximal area, interproximal area

Full-mouth survey including bitewing consists of how many films?

20

When taking a radiographic survey, it is best to start with

Molars

Patients should wear the lead apron

All of the time

Which of the following does not effect film density?

when taking bitewing radiographs on the premolars, you should have a PID reading of +5 degrees vertical angle

True

Children's exposure time is often reduced by

ALARA Rule stands for

As low as reasonable achievable

The aluminum filter

Removes low energy rays/ absorbs low energy rays

The collimater

Limits the primary beam

the kV setting controls the quantity of xrays

true

When finished taking xrays, the lead apron should be folded and put away

Increase current mA creates

Molar projections require more or less exposure time then premolar projections

more exposure time

contrast is mostly effected by the kV setting

true

E speed film requires more radiation to achieve good density

false

poor contrast of dental x-rays can result from

chemicals, out of date film, scatter radiation

increased kVp creates higher contrast and greater absorption of xrays by the patient

false

when taking maxillary projections the occlusal plane should be parallel to the floor

true

the white side of the film packet should be placed against the back support on the holder

false

the plastic locator ring should be placed

1/2 inch form the patients face

when taking premolar bitewing, the PID should read

+5 vertical angle

collimation means

restriction of the size of the beam

paralleling technique refers to

film parallel to long axis of tooth

scatter radiation means

the useful beam and secondary radiation

radiography is

the art and science of making xray pictures

who has the responsibility to interpret radiographs?

the dentist

collimation of the primary beam

restricts the size of the beam

the quantity of the xray depends on

mA

filtration of the xray beam protects the patient by

restricting the size of the beam

the most penetrating xrays have

long waves

overlapping of the inter-proximal contacts or teeth is the result of

incorrect horizontal angulation

which cells are most sensitive to xrays

gonadal

the lead foil in the xray film packet is used primarily to

prevent back scatter

film fog can occur if there is

a light lead in the dark room

film is washed after removing it from the developing solution to

stop the developing process

fixing the film

removes the affected silver salts

the optimum time temperature relationship for processing radiographs is

68 degrees Fahrenheit for 5 min

bitewing radiography are useful in helping to determine

inter-proximal caries, proximal hone height, improperly fitted restorative crowns

the raised button on the radiograph aids in

mounting

the operator must avoid

stray radiation, secondary radiation, and primary beam

when exposing a radiograph, the operator should stand

at least 6-8 feet behind the xray head

the greatest danger to the operator is

the central ray, secondary radiation, the primary x ray beam

a way to measure the operators exposure to radiation is

to wear a radiation dosameter badge

the amount of radiation a person receives

is cumulative in the entire body

periapical films

show the crown, supportive structures of the tooth, and root

the occlusal plane of the arch being radiographed should be

perpendicular to the floor

when using the paralleling technique

the film is paralleled to the tooth

film racks should be

cleaned and dry, numbered, lettered or marked, contain enough clips to hold a full series of films.

xrays are most effectively stopped by

lead

after hand processed films are removed from the fixer, they are washed for

20 minutes

elongation is caused by

improper vertical angulation

cone cutting results from the central ray

not being aimed at the center of the film

fore shorting is caused by

improper horizontal angulation

when seating a patient for a radiograph the operator should

tell the patient what is being done, have the patient remove eyeglasses, having the patient remove intraoral removable appliances

how often should the processing solution be changed

every 2 weeks