Review for X-Ray Mod G Test

What is a form of radiation protection for the patient?

A lead apron (not a lead shield)

How is collimator accomplished?

A lead washer

Know what happens when you sterilize?

All forms of microorganisms have been destroyed

What prevents weak radiation leaving the tube during exposure?

Aluminum filter

What is an ION?

An atom that has lost an electron

Why is radiaitin considered harmful?

Because it is cummulative

What x-rays show the interproximal and are cavity detecting radiographs?

Bite wing x-rays

What are considered radiation protection for the operator during patient exposure?

Distance of 6-8 feet from tube Lead shield Double walled gypsum board

What is the hegatively charged particle that is respionsible for producing dental radiogrpahs?

Electrons

The instrument from the XCP kit that allows the operator to align the PID at a right angle to the film and long axis of the the tooth is the?

Metal indicator rod

The cathode is:

Negative terminal

What films are extra oral films?

Panorex Cephalometric Orthopantomograph

The value of radiographs for patient education includes?

Results of missing teeth Implants/bridges form restored mouths Results of reconstructive surgery Orthodontic conditions

The importance of an operator standing behind a lead shield when exposing x-rays is to prevent being exposed to?

Secondary radiation Direct radiation Scatter radiaiton Leakage radiation

What is radiopaque?

Shows white on the film

What substance is found in the emulsion of a film that is responsible for an x-ray?

Silver halide crystals

What causes cone cutting?

The center of the primary beam was not directed to the center of the film

What stops the developing agents?

The fixer

What is a good anatomical landmark to look for when mounting an upper bicuspid film?

The maxillary sinuses

What part of the x-ray machine produces the radiation?

The tube

What is density?

Thickness of an object being radiated

What causes foreshortening?

Too high a vertical angle

What is the purpose of the lead foil of a film packet?

Tp prevent secondary radiaiton from fogging film

What is distortion?

changes in the shape or size of an object

Identify the x-ray beam on the enclosed picture

not avalible --LOOK AT YOUR OWN DIAGRAM----

Why is a dental mask worn?

protect the mucous membranes of the nose and mouth

How much radiation is reduced by using Ultra Speed film?

65 %

What is contrast?

Difference between black, white, and shades of grey

The speed of electrons through a circuit is referred to as ?

Kilovoltage

What is th eoccupational dose limits for radiation exposure in a calendar quarter (13 weeks) for the whole body?

1.25 REMS

What is the target distance for the paralleling technique?

12-16 inches

A full mouth x-ray for an edentulous patient would include?

14 periapicals and NO bitewings

Exposure to an edentulous patient can be reduced by?

25 %

At what age is the first radiographs survey on a child?

3 years of age

What is the minimum allowable distance of the dark room safety light from the work counter top?

4 feet

What material is responsible for giving support and stiffness to the x-ray film?

Cellulose acetate

An extra-oral film that shows a lateral view of the skull is?

Cephalometric

What is reticulation?

Cracking of the film emilsion due to excessive heat during processing

When using ultra speed film would you INCREASE or DECREASE the exposure time?

DECREASE

What is radiolucent?

Degree of darkness on a film

Who can legally expose x-rays described by "California Law" ?

Dental assisstant who passes a board approved course and recieves an x-ray certificate (At least 18 yrs of age)

Know the procedure regarding immersion disinfection?

If any instruments are added to the solution before the disinfection time is up you must start timing all over

What causes the film to turn brown and discolor agter a few days?

Improper washing

WHere is the thermometer placed?

In the water tank

What causes overlapping?

Incorrect horizontal angulation

What are the four body tissue most sensitive to radiation?

Intestinal tissue Embryo Cornea of the eye Bone marrow

Besides gamma rays, what additional radiation wave from the EMR spectrum is considered harmful to tissue due to its wavelength?

Ultra Violet

Know why an ultrasonic cleaner is preferred to hand scrubbing?

Uses sound waves to reach all areas of the instruments Uses a cavitation process Is safer for the auxillary