©THESTAR 2024/2025 ALL RIGHTS RESERVED 11:09PM. A+
Chapter 5 Radiation Protection Exam
Questions With Correct Answers 100%
Verified.
What is the safest area to stand in relation to a primary x-ray beam about to be exposed on a
patient?
(a.) 4 feet away at a 90-degree angle from the beam
(b.) 5 feet away at a 180-degree angle from the beam
(c.) 6 feet away at a 90-135 degree angle from the beam
(d.) 3 feet away at a 90-135 degree angle from the beam - Answer✔(c.) 6 feet away at a 90-135
degree angle from the beam
ALARA concept - Answer✔A concept of radiation protection that state all exposure to radiation
must be kept to a minimum or as low as reasonable achievable
Beam alignment device - Answer✔A device used to align the PID in relation to tooth & receptor
position the intraoral receptor in the mouth & retains the receptor in position during exposure;
helps the receptor in the mouth & reduces the chances of movement, thus reducing the
patients exposure to x-radiation
Collimation - Answer✔The restriction of the size & shape of the x-ray beam in order to reduce
patient exposure
Collimator - Answer✔a diaphragm, usually made of lead, used to restrict the size & shape of the
x-ray
Film D Speed - Answer✔The slowest intramural film, used before E-speed film
Film E Speed - Answer✔The fastest intramural film available before the introduction of F speed
Film F speed - Answer✔The fastest intramural film available aka InSight
1
, ©THESTAR 2024/2025 ALL RIGHTS RESERVED 11:09PM. A+
Film, fast - Answer✔A type of dental x-ray film that requires less radiation for exposure
Filtration - Answer✔The use of absorbing materials (aluminium) for removing the low energy x-
rays from the primary position
Filtration, added - Answer✔Aluminum discs inserted in the dental x-ray machine between the
x-ray tube head seal & collimator; Absorbs low-energy x-rays
Filtration, inherent - Answer✔Occurs when the primary beam passes through the glass window
of the x-ray tube, the insulation oil, and the tube head seal
Filtration, total - Answer✔The combination of the inherent filtration & added filtration in an x-
ray machine
Lead apron - Answer✔a flexible lead shield used to protect the patients reproductive & blood
forming tissues from scatter radiation
Maximum accumulated dose (MAD) - Answer✔The maximum accumulated lifetime radiation
dose that may be received by persons whoa re occupationally exposed to radiation
Maximum permissible dose (MPD) - Answer✔Maximum dose equivalent that a body is
permitted to receive in a specific period.
MPD is the dose of radiation that the body can endure with little or no injury.
Protective barrier - Answer✔a barrier of radiation-absorbing material used to protect the
operator from primary & scatter radiation (wall)
Thyroid Collar - Answer✔A flexible lead shield used to protect the thyroid gland from scatter
radiation
Which of the following is (are) the maximum permissible dose (MPD) for a dental hygienist?
(Select all that apply)
(A) 0.5 rems a year
(B) 5 rems a year
(C) 50 rems a year
(D) 50 mSv
(E) 5 mSv - Answer✔(B) 5 rems a year & (D) 50 mSv
All of the following decrease radiation exposure to the patient EXCEPT one. Which one is the
EXCEPTION?
2
Chapter 5 Radiation Protection Exam
Questions With Correct Answers 100%
Verified.
What is the safest area to stand in relation to a primary x-ray beam about to be exposed on a
patient?
(a.) 4 feet away at a 90-degree angle from the beam
(b.) 5 feet away at a 180-degree angle from the beam
(c.) 6 feet away at a 90-135 degree angle from the beam
(d.) 3 feet away at a 90-135 degree angle from the beam - Answer✔(c.) 6 feet away at a 90-135
degree angle from the beam
ALARA concept - Answer✔A concept of radiation protection that state all exposure to radiation
must be kept to a minimum or as low as reasonable achievable
Beam alignment device - Answer✔A device used to align the PID in relation to tooth & receptor
position the intraoral receptor in the mouth & retains the receptor in position during exposure;
helps the receptor in the mouth & reduces the chances of movement, thus reducing the
patients exposure to x-radiation
Collimation - Answer✔The restriction of the size & shape of the x-ray beam in order to reduce
patient exposure
Collimator - Answer✔a diaphragm, usually made of lead, used to restrict the size & shape of the
x-ray
Film D Speed - Answer✔The slowest intramural film, used before E-speed film
Film E Speed - Answer✔The fastest intramural film available before the introduction of F speed
Film F speed - Answer✔The fastest intramural film available aka InSight
1
, ©THESTAR 2024/2025 ALL RIGHTS RESERVED 11:09PM. A+
Film, fast - Answer✔A type of dental x-ray film that requires less radiation for exposure
Filtration - Answer✔The use of absorbing materials (aluminium) for removing the low energy x-
rays from the primary position
Filtration, added - Answer✔Aluminum discs inserted in the dental x-ray machine between the
x-ray tube head seal & collimator; Absorbs low-energy x-rays
Filtration, inherent - Answer✔Occurs when the primary beam passes through the glass window
of the x-ray tube, the insulation oil, and the tube head seal
Filtration, total - Answer✔The combination of the inherent filtration & added filtration in an x-
ray machine
Lead apron - Answer✔a flexible lead shield used to protect the patients reproductive & blood
forming tissues from scatter radiation
Maximum accumulated dose (MAD) - Answer✔The maximum accumulated lifetime radiation
dose that may be received by persons whoa re occupationally exposed to radiation
Maximum permissible dose (MPD) - Answer✔Maximum dose equivalent that a body is
permitted to receive in a specific period.
MPD is the dose of radiation that the body can endure with little or no injury.
Protective barrier - Answer✔a barrier of radiation-absorbing material used to protect the
operator from primary & scatter radiation (wall)
Thyroid Collar - Answer✔A flexible lead shield used to protect the thyroid gland from scatter
radiation
Which of the following is (are) the maximum permissible dose (MPD) for a dental hygienist?
(Select all that apply)
(A) 0.5 rems a year
(B) 5 rems a year
(C) 50 rems a year
(D) 50 mSv
(E) 5 mSv - Answer✔(B) 5 rems a year & (D) 50 mSv
All of the following decrease radiation exposure to the patient EXCEPT one. Which one is the
EXCEPTION?
2
