HESI Medical Practice on Radiography Exam Solution Manual
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Course
Radiography
Institution
Radiography
Who discovered x-rays? - Answers Wilhelm Konrad Roentgen
What are 9 characteristics of x-rays? - Answers 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 ionizat...
HESI Medical Practice on Radiography Exam Solution Manual
Who discovered x-rays? - Answers Wilhelm Konrad Roentgen
What are 9 characteristics of x-rays? - Answers 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? - Answers 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? - Answers whenever x-rays penetrate matter
What is an electric current? - Answers the flow of electrons from one point to another or through a
conductor
What is an electric current measured in? - Answers amperes
What is a direct current? - Answers 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? - Answers Kilovoltage peak (kVp)
What is kilovoltage? - Answers 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? - Answers the penetrating ability of the x-rays
What is milliamperage? - Answers 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? - Answers milliamperage only deals with the
strength of the x-ray beams
, What is the maximum permissible dose for occupationally exposed persons? - Answers 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? - Answers
MPD=5rem x (N-18)
What does the N stand for in the MPD formula? - Answers The patients age
What does the MPD formula subtract 18 from a person's age? - Answers because people 18 years or
younger are not supposed to work around x-rays
What is erythema? - Answers a temporary reddening of the skin
What is an erythema dose? - Answers the amount of radiation necessary to produce erythema
What is a lead diaphragm and what is it's purpose in the x-ray cone? - Answers 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? - Answers radiation coming directly from the target of the x-ray tube
What is secondary radiation - Answers radiation that is produced whenever x-rays strike matter.
When are secondary x-rays produced? - Answers 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? -
Answers scattered radiation
Where does leakage radiation come from? - Answers 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? - Answers 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? - Answers The small area on the tungsten target to which the
electrons are directed
What does a small focal point permit? - Answers sharper detail on the radiograph
When are x-rays produced? - Answers anytime that high-speed electrons are stopped suddenly
What are somatic cells? - Answers all cells of the body except those of the reproductive organs
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