Columbus dental society, x-ray 7 course post test

The radiation that is emitted from the x-ray tube and strikes the patient directly is called:

Primary Radiation

Compared to radiographic exposure of a patient with complete dentition, when exposing periodical radiographs on an edentulous patient, the exposure time should be:

Decreased

A radiation film monitor badge is used in order to:

Monitor the radiation to which the wearer is exposed

One of the most effective ways to protect an operator from scattered radiation is:

Shielding

Blurred radiographic images can be caused by movement of the:

1. tubehead

2. patient

3. film

Using "E" speed instead of "D" speed radiographic film requires:

Shorter exposure time

What would result if duplicating film were overexposed or exposed to light? The radiograph would:

Appear light

If a film is left in the fixer overnight, it will be:

Completely clear

Which of the following represent the minimum information that should be affixed to an extra oral radiograph?

1. patient name or identification number

2. right and left side orientation

3. date of exposure

The recommended minimum distance for positioning a safelight above the working area where films will be opened and handled is:

4 feet

What error in technique is demonstrated in the radiograph below? (overlapped)

Improper horizontal angulation

A fetus is more susceptible to damage from an x-radiation dose equal to that given to an adult because the fetus has:

More rapidly reproducing cells

To produce an x-ray with greater penetrating power, one should adjust the:

Kilovoltage

Lead aprons should be inspected annually for:

presence of cracks

The artifacts present across the panaromic radiograph above are due to:

Static electricity

If the temperature of the developing solution is slightly above normal, radiographs of the required density may be produced by permitting a:

Shorter developing time

A cylindrical position indicating device (PID) was used to expose the radiograph at right. What is most likely the reason for the white area?

Improper central beam alignment

A darkened area on an exposed and processed film is described as:

Radiolucent

When matter is irradiated by x-rays, which type of radiation is produced?

Secondary

What is the Maximum Permissible Dose (MPD) of radiation annually by the NCRP for a pregnant occupationally-exposed worker?

.005 SV

An extra oral radiograph would be least likely to:

Detect Interproximal caries

The overall lightness or darkness of a radiograph is called:

Density

Which of the following are appropriate areas in which to temporarily store film packets following removal from the mouth?

Disposable Cup

What device is used to control the size and shape of the primary x-ray beam?

Collimator

Which material provides the best protection from x-ray photons? (stops x-rays)

Lead

The cervical collar on a lead apron is placed to protect the:

Thyroid glad

According to the nuclear regulatory commission, the annual maximum permissible dose (MPD) to occupationally - exposed individuals should not exceed:

.05 Sv (50 mSv)

What should be done to correct the error in the radiograph shown below? (smaller than actual size teeth)

Decrease vertical angulation

The paralleling technique of radiographic exposure fulfills which of the following principles of ideal Projection?

1. the radiation source is small

2. the source-object distance is long

3. the object-film distance of short

4. the object and film are parallel

5. the central ray strikes the object and film at a 90 degree angle

After the x-ray unit is turned off, for how long do x-rays continue to exist in the room?

The x-rays no longer exist in the room once the exposure is complete

Interproximal caries can best be detected with which of the following radiographic views?

Bitewing

If the directions on the film package call for an exposure time of 1/6 second, how many impulses should the operator select?

10

How frequently should a complete radiographic survey (CRS) be exposed on a typical adult patient?

Every five years

Which of the following Standard International Units (SIU) is equivalent to the rem?

Sievert

In "real time direct" digital radiography, what is used in place of an x-ray film?

Sensor

In digital radiography, using phosphor plate:

1. images are received and stored on low phosphor plate

2. images have to be transferred to a scanner

4. images on the plate are erased by exposure to light

If a film image is foreshortened, that means:

There was too much vertical angulation

If a herringbone pattern shows up on a radiograph, this means:

The film packet was reversed (lead shield toward CR)

Each successive panoramic radiograph appears lighter than the one before. Which of the following corrections should be made?

Replenish the developer solution

In extra oral radiography, the intensifying screen is used to reduce the:

Exposure time

When processing radiographs, the smell of ammonia indicates that the:

Fixer has contaminated the developer

An aid to correctly mounting processed radiographs is the:

Raised bump on the film

When manually processing radiographs, the standard fixing time at 68 degrees Fahrenheit is:

10 minutes

Placing exposed radiographic film in fixer before developer results in a:

Clear film

The part of an atom that carries a negative charge is a/an:

electron

the quantity of x-rays emitted is primarily dependent upon the:

Milliamperage setting

An aluminum filter in a dental x-ray unit functions to:

Absorb x-rays of long wavelength

Light radiographs can be caused by:

1. film packet reversal

2. low MA setting

3. exhausted developer

Which of the following are principles of Ideal Projection?

1. the central ray should strike the tooth at a 90 degree angle

2. the source-object distance should be as long as possible

3. the source size should be as small as possible

4. the tooth and film should be parallel to each other

Which of the following cause a dark radiographs?

1. too much time in developer

2. too high MA or KVP setting