HESI RADIOGRAPHY EXAM NEWEST 2024 ACTUAL
EXAM COMPLETE 200 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY
GRADED A+
Who discovered x-rays? - ANSWER: Wilhelm Konrad Roentgen
What are 9 characteristics of x-rays? - 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? - 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? - ANSWER: whenever x-rays penetrate matter
What is an electric current? - ANSWER: the flow of electrons from one point to
another or through a conductor
What is an electric current measured in? - ANSWER: amperes
What is a direct current? - 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? - ANSWER: Kilovoltage peak (kVp)
What is kilovoltage? - 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? - ANSWER: the penetrating ability of the x-rays
What is milliamperage? - 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? - ANSWER:
milliamperage only deals with the strength of the x-ray beams
, What is the maximum permissible dose for occupationally exposed persons? -
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?
- ANSWER: MPD=5rem x (N-18)
What does the N stand for in the MPD formula? - ANSWER: The patients age
What does the MPD formula subtract 18 from a person's age? - ANSWER: because
people 18 years or younger are not supposed to work around x-rays
What is erythema? - ANSWER: a temporary reddening of the skin
What is an erythema dose? - 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? - 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? - ANSWER: radiation coming directly from the target of
the x-ray tube
What is secondary radiation - ANSWER: radiation that is produced whenever x-rays
strike matter.
When are secondary x-rays produced? - 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? - ANSWER: scattered radiation
Where does leakage radiation come from? - 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? -
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)
What is the focal spot of a x-ray tube? - ANSWER: The small area on the tungsten
target to which the electrons are directed
What does a small focal point permit? - ANSWER: sharper detail on the radiograph
EXAM COMPLETE 200 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY
GRADED A+
Who discovered x-rays? - ANSWER: Wilhelm Konrad Roentgen
What are 9 characteristics of x-rays? - 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? - 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? - ANSWER: whenever x-rays penetrate matter
What is an electric current? - ANSWER: the flow of electrons from one point to
another or through a conductor
What is an electric current measured in? - ANSWER: amperes
What is a direct current? - 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? - ANSWER: Kilovoltage peak (kVp)
What is kilovoltage? - 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? - ANSWER: the penetrating ability of the x-rays
What is milliamperage? - 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? - ANSWER:
milliamperage only deals with the strength of the x-ray beams
, What is the maximum permissible dose for occupationally exposed persons? -
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?
- ANSWER: MPD=5rem x (N-18)
What does the N stand for in the MPD formula? - ANSWER: The patients age
What does the MPD formula subtract 18 from a person's age? - ANSWER: because
people 18 years or younger are not supposed to work around x-rays
What is erythema? - ANSWER: a temporary reddening of the skin
What is an erythema dose? - 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? - 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? - ANSWER: radiation coming directly from the target of
the x-ray tube
What is secondary radiation - ANSWER: radiation that is produced whenever x-rays
strike matter.
When are secondary x-rays produced? - 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? - ANSWER: scattered radiation
Where does leakage radiation come from? - 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? -
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)
What is the focal spot of a x-ray tube? - ANSWER: The small area on the tungsten
target to which the electrons are directed
What does a small focal point permit? - ANSWER: sharper detail on the radiograph
