Radiation units of measurement (RTBC)-
Test Questions with Solutions
Equivalent dose is calculated as: ✔️Correct Ans-D x radiation waiting factor (Wr)
The primary difference between absorbed dose (D) an equivalent dose (EqD) is that the
equivalent dose takes into account the : ✔️Correct Ans-Radiation type
A radiation worker inhales a large volume of alpha emitting radon gas (Wr = 20), resulting in an
absorbed dose of 1.02 grays (Gy) to the lungs. What is equivalent dose? ✔️Correct Ans-20.4
Sieverts (Sv)
A nuclear medicine technologist receives and absorbed dose of 1.8 milligrams (mGy). Assume
that 1.0 mGy came from beta radiation (Wr = 1), and the remainder came from alpha particles
(Wr = 20). What is the equivalent dose? ✔️Correct Ans-17.0 millisieverts
When the linear energy transfer (LET) of radiation increases, the relative biological effectiveness
(RBE) will: ✔️Correct Ans-Increase
What radiation waiting factor (Wr) is assigned to radiation with the large relative biological
effectiveness (RBE)? ✔️Correct Ans-High Wr
Equivalent dose is measured in units of: ✔️Correct Ans-Sievert (Sv)
, Effective dose (efD) is calculated as ✔️Correct Ans-Absorbed dose (D) x radiation weighting
factor (Wr) x tissue, weighting factor (Wt)
What variables must be known to calculate the effective dose for a patient or occupational
worker? ✔️Correct Ans-Absorbed dose, exposed tissue types, and radiation type
Which of the following body tissues is most likely to develop cancer from exposure to equal
doses of ionizing radiation? ✔️Correct Ans-breasts
The main purpose of effective dose is to project the risk of biological harm based on what factor?
✔️Correct Ans-exposed tissue
A patient received an absorbed dose of 10 milligray to their lungs from x-rays. Assuming that the
lungs have a tissue waiting factor of .12, what is the effective dose? ✔️Correct Ans-1.2
millisieverts
A patient received a thyroid ablation treatment using an intravenously injected radionuclide.
Assume that the absorbed dose to the thyroid is .59 gray. The thyroid has a tissue weighting
factor of .04 and the emitted radiation has a radiation waiting factor of 1.0. What is the effective
dose?? ✔️Correct Ans-0.0236 sieverts (Sv)
Which of the following situations result in the highest probability of causing radiation induced
cancer? ✔️Correct Ans-17 milligray absorb those to the lungs from alpha radiation
The effective dose is measured in units of: ✔️Correct Ans-Sieverts
Test Questions with Solutions
Equivalent dose is calculated as: ✔️Correct Ans-D x radiation waiting factor (Wr)
The primary difference between absorbed dose (D) an equivalent dose (EqD) is that the
equivalent dose takes into account the : ✔️Correct Ans-Radiation type
A radiation worker inhales a large volume of alpha emitting radon gas (Wr = 20), resulting in an
absorbed dose of 1.02 grays (Gy) to the lungs. What is equivalent dose? ✔️Correct Ans-20.4
Sieverts (Sv)
A nuclear medicine technologist receives and absorbed dose of 1.8 milligrams (mGy). Assume
that 1.0 mGy came from beta radiation (Wr = 1), and the remainder came from alpha particles
(Wr = 20). What is the equivalent dose? ✔️Correct Ans-17.0 millisieverts
When the linear energy transfer (LET) of radiation increases, the relative biological effectiveness
(RBE) will: ✔️Correct Ans-Increase
What radiation waiting factor (Wr) is assigned to radiation with the large relative biological
effectiveness (RBE)? ✔️Correct Ans-High Wr
Equivalent dose is measured in units of: ✔️Correct Ans-Sievert (Sv)
, Effective dose (efD) is calculated as ✔️Correct Ans-Absorbed dose (D) x radiation weighting
factor (Wr) x tissue, weighting factor (Wt)
What variables must be known to calculate the effective dose for a patient or occupational
worker? ✔️Correct Ans-Absorbed dose, exposed tissue types, and radiation type
Which of the following body tissues is most likely to develop cancer from exposure to equal
doses of ionizing radiation? ✔️Correct Ans-breasts
The main purpose of effective dose is to project the risk of biological harm based on what factor?
✔️Correct Ans-exposed tissue
A patient received an absorbed dose of 10 milligray to their lungs from x-rays. Assuming that the
lungs have a tissue waiting factor of .12, what is the effective dose? ✔️Correct Ans-1.2
millisieverts
A patient received a thyroid ablation treatment using an intravenously injected radionuclide.
Assume that the absorbed dose to the thyroid is .59 gray. The thyroid has a tissue weighting
factor of .04 and the emitted radiation has a radiation waiting factor of 1.0. What is the effective
dose?? ✔️Correct Ans-0.0236 sieverts (Sv)
Which of the following situations result in the highest probability of causing radiation induced
cancer? ✔️Correct Ans-17 milligray absorb those to the lungs from alpha radiation
The effective dose is measured in units of: ✔️Correct Ans-Sieverts
