Radiation Health and Safety EXAM Save

When taking a panoramic radiograph of an obese patient, as compared to a slim patient, exposure (kVp or mA) should

to be increased

The major disadvantage of the bisecting angle technique is that

Image distortion is more likely

The reduce cross - contamination during radiography, the CDC and ADA recommended that the operators do all of the following EXCEPT

Take complete medical histories

Ideally, a lead apron would be used

For any dental radiographs

A full mouth radiographic series has just been processed manually. The operator notes that the films on the button of the rack are of different density. What could have caused this?

Solutions were not stirred before processing

A film that has been exposed to scattered radiation will appear

Fogged

X-ray exposure time should be increased if the patient is

A large adult

Before exposing a panoramic radiograph on a patient, the operator should request the removal of all of the following EXCEPT:

Watch

A parent refuses for i have radiographs taken on his/her child. The dental assistant should

Inform the dentist and document Parent's refusal

Incorrect horizontal angulation of the primary beam produces

Overlapping of proximal surfaces

Where is the radiographic landmark incisive foramen usually located

Maxillary anterior

Cephalometric radiographs are primarily indicated to evaluate

Jaw relationships

When taking a panoramic radiograph, the patient's head should be oriented

with the midsagittal plane perpendicular to the floor

Which of the following is MOST likely to contribute to the fogging of x - ray film

light leaks in the dark room

Which of the following conditions will result in a radiographic image that is too light?

Weak developing solution

The purpose of using film - holding devices when taking intraoral radiographs is to

Assist in correct film placement

A film with thin density and a herringbone pattern across it is the result of:

Film packet reversal

A full mouth radiographic survey has just been processed manually. The top films on the processing rack have a straight, clear border on the upper edge. This error is caused by

Too low a level of developer solution

Using a faster speed film requires

shorter exposure time

The life expectancy of radiographic processing solution depends upon all of the following EXCEPT

temperature of the solution

Insufficient washing of processed radiographic film will result in a

Brownish - yellow stain on the radiograph

A radiograph turns brown over time. The MOST likely cause is

Under washing

When processing a radiograph, the darkroom overhead light was off, the safety light was on, and the door was slightly open. What effect will exposure to minor amounts of room light have on the processed radiograph? It will appear

Black

Density of a radiograph is controlled by all of the following EXCEPT

OFD [[object film distance]]

Which method is considered MOST effective for handling and processing radiographs to prevent microbial contamination?

cover with barrier envelopes

A person exposing x-rays can BEST be protected from scattered radiation by

standing behind a lead barrier

Radiographs mounted with the raised portions of the dots toward the observer (labial mounting) are examined as though the observer is

Outside the mouth looking in

A film accidentally exposed to white light between developing and fixing will appear

dark

Stirring the developing and fixing solutions before manually processing films will

Provide uniform concentrations

If there is no teeth to serve as guides, which of the following landmarks indicate a maxillary molar area radiograph

Tuberosity

Which of the following materials is MOST resistant to the penetration of ionizing radiation?

Lead

In which radiographic technique is the patient positioned in a device to support his chin?

Panoramic

What is the major advantage in using the highest speed film and higher Kilovoltage (kV)

Reduces the radiation to patient

The best way to correct a cone cutting error is to

Adjust film position

If all known radiation safety precautions are exercised, an operator who is pregnant can safely expose radiographs during the operator's

entire pregnancy

Should the exposure time change when radiographing an edentulous adult patient versus an adult patient with a full dentition?

yes, its decrease

If a dental auxiliary's radiation badge report indicates exposure to small amounts of radiation, what should be done first?

evelauate the xray equipment and techniques

In dental radiography, it is necessary to have a filter to

eliminate the less penetrating x-rays from the primary beam

The BEST radiograph to choose to evaluate a suspected sublingual salivary duct obstruction is

Occlusal

What information helps to distinguish maxillary molar radiographs from mandibular molar radiographs

The outline of the maxillary sinus is visible

The time between exposure to x rays and the appearance of radiation damage is the

Latent period

Foreshortening of the radiographic image when using the bisecting angle technique (BAT) results from too

Much vertical angulation

Contrast on a dental radiograph can be altered by changing the

kilovoltage

Which of the following should be performed to control the quality of x ray processing solutions in an automatic processor

Check solution levels daily

The crystals found in the emulsion of intraoral dental film that are sensitive to radiation are made of

Silver halide (bromide)

Tube head rotation during exposure is required for which of the following techniques?

Panoramic

For intraoral radiology, a double film packet is used to

Produce identical films with a single exposure

Bitewing films are usually used to

Detect carries

Which of the following landmarks would be most likely to indicate the midline of the mandible?

genial tubercles

Bremsstrahlung (breaking radiation) is produced when electrons collide with the target, creating

Secondary radiation

The ability of x rays to remove electrons from an atom is called

Ionization

Atoms the have lost electrons are referred to as

Ions

The harmful effects of x irradiation on human tissue is

Cumulative

The human tissue most sensitive to ionizing radiation is the

Formative embryo

According to government guidelines, the yearly while body radiation dose for occupationally exposed workers must not exceed

5 rems (50 mSv)

The tungsten filament in the dental x ray tube is part of the

Cathode

The function of the collimator in the tube head of the x ray unit that directs the useful beam is referred to as the

PID

The PID is the least effective in minimizing scatter radiation is the

Pointed cone

The safest position for an operator during exposure of anterior dental films is

Behind a lead barrier

What is the cause when only one film in a complete dental survey is clear after being processed

No exposure

The height of the safelight above the darkroom bench should be at least

4 feet

Flaws or faults exhibited in the production of intraoral radiographs are due to what types of errors

Exposure errors

Processing errors

Film handling

Film storage

The quality of penetrating ability of the electrons is controlled by the setting of the

Kilovoltage

When comparing the recommended exposure of E speed film with D speed film, the E film requires a reduction of radiation exposure by

1/2

intensifying screens found in cassettes are coated with

Calcium tungstate crystals

Rare earth phosphors

During film placement, the embossed dot of the film packet should be placed toward the occlusal or Incisal edges with the exception of what exposures?

Bitewings

The area of sharp focus in a panoramic radiograph is called the

Focal trough

Using the parallel technique for correct vertical angulation, the opening of the PID should be positioned

Perpendicular to the long axis of the teeth the be radiographed

In correct horizontal angulation, the central beam is directed

through the contact areas of two adjacent teeth

A white inverted V-shaped radiopacity on the bottom of the film is most likely caused by

lead apron artifact

If teeth appear foreshortened on the original radiograph, the vertical angulation of the central beam for the retake is

Decreased

Occlusal dental radiographs are used to

Localize foreign bodies

Which of the projections is be for viewing the maxillary sinus

Waters view

Which of the following is true in regard to an endentulous radiographic survey

A typical survey may contain as many as 14 periapical films

Compared with x rays produced by a 70 kV dental x ray machine, x rays produced by a 90 kV machine are

More penetrating

The optimum developing solution temperature for manual processing is

4.5 to 5 mins at 68 F

According to federal regulations, the beam size should be not exceed what number of inches at the patients skin surface?

2 3/4

Which of the following is responsible for collimation?

Lead diaphragm

Which of the following is true in regard to the care of intensifying screens?

They should be cleaned periodically with a product containing an antistatic compound

Which of the following are true of duplicating film?

Emulsion is on one side only

X rays are made up of

photons

Milliamperage controls

Heating of the cathode

The lead diaphragm determines the size and shape of

x-ray beam

To increase the penetrating quality of an x ray beam, the auxiliary must

increase kVp

Filtration of the x ray beam protects the patient by

Eliminating weak wavelength X-rays from the X-ray beam

Scatter radiation is type of

secondary radiation

Film speed is determined by the

Size of the silver bromide crystal

The principal used in panoramic radiography is

Tomography

The raised button on the radiograph aids in

mounting

Which of the following does not use ionizing radiation

Digital radiology

Intensifying screens are used with extraoral films to

Increase the KVP

Which of the following is not a benefit of digital imaging?

Sensor size