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