Radiography HESI Practice| UPDATE Comprehensive Questions and Verified Answers
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Course
Radiography HESI
Institution
Radiography HESI
Who discovered x-rays? -Correct Answer Wilhelm Konrad Roentgen
What are 9 characteristics of x-rays? -Correct Answer 1. the ability to penetrate opaque substances
2. the ability to affect silver halide salts on films in the same manner as light does
3. the ability to stimulate or destroy tis...
Radiography HESI Practice|2024-2025
UPDATE Comprehensive Questions and
Verified Answers
Who discovered x-rays? -Correct Answer ✔Wilhelm Konrad Roentgen
What are 9 characteristics of x-rays? -Correct Answer ✔1. the ability to penetrate
opaque substances
2. the ability to affect silver halide salts on films in the same manner as light does
3. the ability to stimulate or destroy tissue by ionization
4. they travel at a constant speed, the speed of light
5. they cause fluorescence
6. they are high energy waves
7. they travel as electromagnetic waves or energy
8. they have no mass
9. they travel in a straight line and are invisible
What is ionization? -Correct Answer ✔The production of ions by the removal of
electrons from the atoms of the matter that is struck by the x-rays
When does ionization occur? -Correct Answer ✔whenever x-rays penetrate matter
What is an electric current? -Correct Answer ✔the flow of electrons from one point to
another or through a conductor
What is an electric current measured in? -Correct Answer ✔amperes
What is a direct current? -Correct Answer ✔current flowing in one direction, that is, from
positive and negative. Direct current can be interrupted at certain set intervals
What is kilovoltage usually designated as? -Correct Answer ✔Kilovoltage peak (kVp)
What is kilovoltage? -Correct Answer ✔the measure of the force between the negative
cathode and the positive anode and controls the energy of the electrons striking the
tungsten target.
What does kilovoltage control? -Correct Answer ✔the penetrating ability of the x-rays
What is milliamperage? -Correct Answer ✔the measurement of the quantity or the
number of electrons passing from cathode to anode per second.
Radiography HESI Practice
, Radiography HESI Practice
What does milliamperage have to do with the x-ray beams? -Correct Answer
✔milliamperage only deals with the strength of the x-ray beams
What is the maximum permissible dose for occupationally exposed persons? -Correct
Answer ✔5 rems per year (.1 in one week, 3 rem in any 13 week period)
What is the maximum permissible dose formula for occupationally exposed persons? -
Correct Answer ✔MPD=5rem x (N-18)
What does the N stand for in the MPD formula? -Correct Answer ✔The patients age
What does the MPD formula subtract 18 from a person's age? -Correct Answer
✔because people 18 years or younger are not supposed to work around x-rays
What is erythema? -Correct Answer ✔a temporary reddening of the skin
What is an erythema dose? -Correct Answer ✔the amount of radiation necessary to
produce erythema
What is a lead diaphragm and what is it's purpose in the x-ray cone? -Correct Answer
✔The lead diaphragm is a metal disk 0.16 cm thick of lead with a hole in the center. It's
purpose is to collimate or limit the size of the beam of radiation.
What is primary radiation? -Correct Answer ✔radiation coming directly from the target of
the x-ray tube
What is secondary radiation -Correct Answer ✔radiation that is produced whenever x-
rays strike matter.
When are secondary x-rays produced? -Correct Answer ✔when x-rays pass through the
tissues of the face during dental x-ray procedures
What primary radiation that has been deviated in direction during passage through a
substance? -Correct Answer ✔scattered radiation
Where does leakage radiation come from? -Correct Answer ✔May come from the wall
of the tube housing or may come from around the cone
What are the 3 important conditions necessary for the production of x-rays? -Correct
Answer ✔1. a source of electrons (heated filament)
2. a means of accelerating the high speed electrons between one third and one half the
speed of light (a high positive potential)
3. A means of stopping these high-speed electrons suddenly (tungsten target)
Radiography HESI Practice
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