CH 14 Radiation Dosimetry Exam
Actual Questions and Answers 2026
The ionizing radiation used in CT is an x-ray with maximum energy
from 120 to 140 keV and an average energy near what keV? -
correct answer ✅70 keV
The CT dose index can only be calculated when? -
correct answer ✅When slices are contiguous
How many times greater is radiation exposure from a whole body
CT scan compared to a chest x-ray? -
correct answer ✅100x
How many mSv is a whole body CT scan? -
correct answer ✅10mSv
Given the same dose of radiation, how many times more likely is it
for a 1 year old infant to develop a malignancy than it is for a 50
year old adult? -
correct answer ✅6x
How does filtration affect the radiation dose? -
correct answer ✅Decreased dose by removing soft x-rays
, CH 14 Radiation Dosimetry Exam
Actual Questions and Answers 2026
How many centigray's are equivalent to 1 rad? -
correct answer ✅1
How many rad are in 1 Gy? -
correct answer ✅100
How much do extra images add to the patient's radiation dose from
the exam? -
correct answer ✅10%
Iterative reconstruction can reduce the dose by how much? -
correct answer ✅50%
What percent of all preds CT exams are not clearly indicated? -
correct answer ✅40%
Which dose is the product of the absorbed dose and radiation
weighting factor? -
correct answer ✅Equivalent dose
What is the unit for equivalent dose? -
correct answer ✅Rem
Actual Questions and Answers 2026
The ionizing radiation used in CT is an x-ray with maximum energy
from 120 to 140 keV and an average energy near what keV? -
correct answer ✅70 keV
The CT dose index can only be calculated when? -
correct answer ✅When slices are contiguous
How many times greater is radiation exposure from a whole body
CT scan compared to a chest x-ray? -
correct answer ✅100x
How many mSv is a whole body CT scan? -
correct answer ✅10mSv
Given the same dose of radiation, how many times more likely is it
for a 1 year old infant to develop a malignancy than it is for a 50
year old adult? -
correct answer ✅6x
How does filtration affect the radiation dose? -
correct answer ✅Decreased dose by removing soft x-rays
, CH 14 Radiation Dosimetry Exam
Actual Questions and Answers 2026
How many centigray's are equivalent to 1 rad? -
correct answer ✅1
How many rad are in 1 Gy? -
correct answer ✅100
How much do extra images add to the patient's radiation dose from
the exam? -
correct answer ✅10%
Iterative reconstruction can reduce the dose by how much? -
correct answer ✅50%
What percent of all preds CT exams are not clearly indicated? -
correct answer ✅40%
Which dose is the product of the absorbed dose and radiation
weighting factor? -
correct answer ✅Equivalent dose
What is the unit for equivalent dose? -
correct answer ✅Rem
