NDHCB- Radiography UPDATED ACTUAL Exam Questions
and CORRECT Answers
Radiation travels at which speed? - (ANSWERS)The speed of light !@#$%%%%%
%%%%%%
What happens to the energy and penetrating ability when the wavelength is shorter? -
(ANSWERS)The radiation energy and penetrating power is greater
Which is a negative electrode? - (ANSWERS)Cathode
Which is a positive electrode? - (ANSWERS)Anode
What on the control panel increases the penetrating ability? - (ANSWERS)Kilovoltage peak- kvp
General radiation produces what percent of x-ray photons by dental x-ray machines? -
(ANSWERS)70
What is primary radiation? - (ANSWERS)Penetrating beam that is produced at the target anode
What is beam quality and density controlled by? - (ANSWERS)kvp
Is an increase in energy an increase or decrease in wavelengths? - (ANSWERS)Decrease
What is beam quantity controlled by? - (ANSWERS)ma
What does density refer to on a radiograph? - (ANSWERS)Overall darkness of an image
Increasing kvp does what to contrast? - (ANSWERS)Creates a low contrast (many shades of
grey)
Decreasing the kvp does what to contrast? - (ANSWERS)Creates a high contrast (few shades of
grey, mostly dark and light)
Increasing the beam quantity, or ma, does what to the density? - (ANSWERS)Increases the
density resulting in a darker image
Decreasing the beam quantity, or ma, does what to the density? - (ANSWERS)Decreases the
density resulting in a lighter image
What type of radiation injury is ionization? - (ANSWERS)Causes a breakage in the molecule, can
affect structures such as DNA
What type of radiation injury is radiolysis of water? - (ANSWERS)Yields free radicals that
combine to form hydrogen peroxide which is toxic to living tissues
, NDHCB- Radiography UPDATED ACTUAL Exam Questions
and CORRECT Answers
!@#$%%%%%
What is a stomatic effect? - (ANSWERS)See in the irradiated person but are not passed on to
future generations %%%%%%
What effects are associated with large amounts of radiation absorbed in a short time? -
(ANSWERS)Short-term affects
What effects are associated with small amounts of radiation absorbed repeatedly over a long
period of time? - (ANSWERS)Long-term effects
What is the sequence of radiation injury? - (ANSWERS)Latent period, period of injury, recovery
period, cumulative effects
What is the latent period? - (ANSWERS)The time between exposure to radiation and the
appearance of the first observable clinical sign
What are the factors that determine tissues sensitivity? - (ANSWERS)Mitotic activity (cells that
divide frequently), cell differentiation (cells that are immature), cell metabolism
Which tissue(s) and organ(s) are the most sensitive? - (ANSWERS)Lymphatic tissue
Which tissue(s) and organ(s) are the most radioresistant? - (ANSWERS)Nerve
Oral and maxillofacial radiography constitute what percent of medical exposures? -
(ANSWERS)5
What is the average annual effective dose to an individual in the U.S? - (ANSWERS)6.2 msv
What is the fastest image receptor? - (ANSWERS)F speed
What is the slowest image receptor? - (ANSWERS)D speed
If a structural wall or shield is not available for the dental hygienist during exposure, how far
should he/she stand from the source of radiation? - (ANSWERS)6 feet
What does MPD (maximum permissible dose)? - (ANSWERS)Maximum dose the body is
permitted to receive within a specific period
What is the MPD for a hygienist? - (ANSWERS)50 msv annually
What is the MPD for a non-occupationally exposed person? - (ANSWERS)5 msv annually
What is the material of a dental x-ray film base? - (ANSWERS)Polyester
and CORRECT Answers
Radiation travels at which speed? - (ANSWERS)The speed of light !@#$%%%%%
%%%%%%
What happens to the energy and penetrating ability when the wavelength is shorter? -
(ANSWERS)The radiation energy and penetrating power is greater
Which is a negative electrode? - (ANSWERS)Cathode
Which is a positive electrode? - (ANSWERS)Anode
What on the control panel increases the penetrating ability? - (ANSWERS)Kilovoltage peak- kvp
General radiation produces what percent of x-ray photons by dental x-ray machines? -
(ANSWERS)70
What is primary radiation? - (ANSWERS)Penetrating beam that is produced at the target anode
What is beam quality and density controlled by? - (ANSWERS)kvp
Is an increase in energy an increase or decrease in wavelengths? - (ANSWERS)Decrease
What is beam quantity controlled by? - (ANSWERS)ma
What does density refer to on a radiograph? - (ANSWERS)Overall darkness of an image
Increasing kvp does what to contrast? - (ANSWERS)Creates a low contrast (many shades of
grey)
Decreasing the kvp does what to contrast? - (ANSWERS)Creates a high contrast (few shades of
grey, mostly dark and light)
Increasing the beam quantity, or ma, does what to the density? - (ANSWERS)Increases the
density resulting in a darker image
Decreasing the beam quantity, or ma, does what to the density? - (ANSWERS)Decreases the
density resulting in a lighter image
What type of radiation injury is ionization? - (ANSWERS)Causes a breakage in the molecule, can
affect structures such as DNA
What type of radiation injury is radiolysis of water? - (ANSWERS)Yields free radicals that
combine to form hydrogen peroxide which is toxic to living tissues
, NDHCB- Radiography UPDATED ACTUAL Exam Questions
and CORRECT Answers
!@#$%%%%%
What is a stomatic effect? - (ANSWERS)See in the irradiated person but are not passed on to
future generations %%%%%%
What effects are associated with large amounts of radiation absorbed in a short time? -
(ANSWERS)Short-term affects
What effects are associated with small amounts of radiation absorbed repeatedly over a long
period of time? - (ANSWERS)Long-term effects
What is the sequence of radiation injury? - (ANSWERS)Latent period, period of injury, recovery
period, cumulative effects
What is the latent period? - (ANSWERS)The time between exposure to radiation and the
appearance of the first observable clinical sign
What are the factors that determine tissues sensitivity? - (ANSWERS)Mitotic activity (cells that
divide frequently), cell differentiation (cells that are immature), cell metabolism
Which tissue(s) and organ(s) are the most sensitive? - (ANSWERS)Lymphatic tissue
Which tissue(s) and organ(s) are the most radioresistant? - (ANSWERS)Nerve
Oral and maxillofacial radiography constitute what percent of medical exposures? -
(ANSWERS)5
What is the average annual effective dose to an individual in the U.S? - (ANSWERS)6.2 msv
What is the fastest image receptor? - (ANSWERS)F speed
What is the slowest image receptor? - (ANSWERS)D speed
If a structural wall or shield is not available for the dental hygienist during exposure, how far
should he/she stand from the source of radiation? - (ANSWERS)6 feet
What does MPD (maximum permissible dose)? - (ANSWERS)Maximum dose the body is
permitted to receive within a specific period
What is the MPD for a hygienist? - (ANSWERS)50 msv annually
What is the MPD for a non-occupationally exposed person? - (ANSWERS)5 msv annually
What is the material of a dental x-ray film base? - (ANSWERS)Polyester
