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Radiation Safety

Radiation Health and Safety

QuestionAnswer
While exposing digital images, radiation deflecting off the patient's head is called scatter radiation.
Which type of radiation is formed by the interaction of x-rays with matter? Secondary radiation
What position-indicating device (PID) shape most effectively reduces patient exposure to radiation? rectangular.
When changing the 8-inch PID to a 16-inch PID, what is used to determine the intensity of the beam? inverse square law
Which tissues is the most highly radiosensitive? skin.
Which landmark is useful when mounting images of the mandibular posterior area? mental foramen.
The most important step the dentist can take in protecting patients from x-radiation is to properly prescribe radiographs.
According to the inverse square law, when changing the PID length from 8 to 16 inches, the beam's intensity is 1/4 as intense
Personnel monitoring for radiation exposure is done by wearing a dosimeter.
What was established to address the education and certification of radiographic equipment operators? Consumer-Patient Radiation Health and Safety Act.
The degree of radiation injury can be determined by the amount of tissue irradiated
Which organ is the most sensitive to radiographic exposure? thyroid gland.
What is the name of the process for the harmful effects of radiation? ionization
What is the time between patient exposure to radiation and the appearance of biological damage called? latent period.
Using the ALARA concept as a guideline for radiographs does NOT include using a circular PID.
When exposing radiographs, what is the minimum distance the operator should stand from the tube head? 6 feet.
The maximum permissible dose (MPD) of ionizing radiation for occupational exposure is 5.0 rem per year.
Long-term effects of exposure to radiation may be associated with birth abnormalities
If a dental assistant dosimeter badge report indicates exposure to radiation, what should be done first? evaluate the x-ray equipment and techniques.
The diameter of the cone-shaped beam produced from a circular collimator is 2.75 inches
To produce ionizing radiation, an atom must add an electron
When taking radiographs on a small child who cannot hold the sensor intra-orally, the operator should ask a parent or guardian to hold the sensor.
Patients receive less radiation when using a/an rectangular PID
What is the most effective method of reducing patient exposure to x-radiation? digital radiography.
What may cause unnecessary radiation exposure to the patient? radiograph technique errors.
What affects the number of x-rays being emitted from the tubehead? mA
Who is most susceptible to radiation damage? infants
What can help protect patients from excess radiation damage to tissues? High kVp
Which PID reduces patient radiation exposure by up to 70 percent when compared to a round position-indicating device? rectangular-shaped.
What is adjusted t to create wavelengths with the greatest penetrating power? kVp.
Somatic effects of radiation do NOT have damaging effects on offspring.
Dental x-rays should be prescribed when the benefits outweigh the risk of harm.
What is the purpose of a rectangular collimator? reduce radiation to the patient.
For x-ray machines operating in ranges at or below 70 kVp, the total aluminum equivalent filtration must be at least 1.5 mm.
Which sequence best describes radiation injury to tissue? latent period, period of injury, period of recovery
The annual maximum accumulated dose (MAD) of radiation for dental assistant is based on which of the following calculations? age minus 18 times 5 rems/year.
Which measurement of force refer to the potential difference between two electrical charges? Voltage
Which radiolucent landmark is useful when mounting images in the mandibular anterior area? lingual foramen
Contrast in a digital image primarily controlled by kVp
Which organization regulates the manufacturing and installation of x-ray equipment? Federal Government.
Added filtration in the x-ray tubehead protects the patient
What is a long-term effect of radiation? genetic defects
What step should be taken immediately if the tubehead drifts? Stop using machine and have it fixed.
The shorter the wavelength of electromagnetic radiation, the greater the energy
Dental healthcare personnel who are pregnant can expose radiographs during their entire pregnancy.
The cells most suspectable to radiation damage are bone marrow
What is used to measure excessive occupational exposure? dosimeter.
What is the advantage of using digital radiography? reduces the radiation to patient.
What effect can be caused when exposed to radiation? no matter how small, radiation has the potential to cause harmful biologic changes
Dental healthcare personnel can BEST shield themselves from radiation during patient exposure by standing behind drywall barrier.
How do you measure tissue damage from x-ray energy? radiation absorbed dose.
Using a lead apron with a thyroid collar during dental radiographs protects the patient from scatter radiation.
Radiation injury can be measured by dose rate.
Which landmark is useful when mounting images in the maxillary posterior area? floor of the maxillary sinus.
Personnel radiation monitoring devices are worn to to record the occupational exposure received by the operator.
What must be monitored for radiation leakage? dental x-ray machines.
The radiation exposure that poses the greatest hazard to the operator is Leakage radiation
What affects the speed of the electrons emitted from the tubehead? kVp.
What prevents x-rays from escaping the tubehead? leaded-glass housing.
The most common artificial radiation exposure comes from medical radiation.
What helps decrease the exposure of the thyroid gland from the primary radiation beam? paralleling technique
The penetrating x-ray beam made during dental radiography is called primary radiation
Which protection technique is used to minimize x-radiation exposure to the operator? structural shielding.
What measures the amount of radiation that reaches the surface of the skin? roentgen
ALARA is primarily concerned with the radiation that is artificial.
Leakage radiation is any radiation that is from the primary beam.
Which three types of radiation protection methods should be used to minimize radiographer exposure? barrier, monitoring device, operator position.
The aluminum disc in the x-ray tubehead filter out long wave x-rays from the primary beam
The most important responsibility of the dental radiography operator is implementing ALARA principle.
During patient exposure, protection from radiation for the operator includes standing behind a wall.
Which cells exposed to radiation may be associated with leukemia? somatic
Which landmark is useful when mounting images in the maxillary central area? anterior nasal spine.
Human tissue is mainly composed of Water/H20
Created by: Chairside
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