Rad Tech Physics

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65 Terms

1

Which part of the nucleus has no charge?

Neutron

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2

Which of the following is responsible for most of the scattered radiation in the diagnostic range?


Thompson effect (photon skipping)
Bremsstrahlung radiation
Photoelectric effect
Compton scattering effect

Compton scattering effect

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3

Who is given credit for originally describing what an atom looks like?

Neils Bohr

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4

X-rays are classified as what type of radiation?


a. Expansion
b. sound
c. destructive
d. electromagnetic

Electromagnetic

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5

Which of the following meters does not register until an x-ray exposure is made?

Kilovolt
Milliammeter
Prereading kilovolt
Prereading ammeter

Milliammeter

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6

When were x-rays discovered and by whom?

November 8, 1895 by Wilhelm Roentgen

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7

Which of the following would not be found in the nucleus of an atom?

Electron

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8

Which of the following is the filtration that is manufactured into the x-ray tube?

Added filtration
Compensating filtration
Adjusted filtration
Inherent filtration

Inherent filtration

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9

Which of the following does not affect the attenuation of an x-ray beam?

Scatter
Speed
Distance
Absorption

Distance

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10

Which of the following represents a high energy x-ray photon?

Short wavelength
Long wavelength
Low frequency
High speed

Short wavelength

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11

Which of the following x-ray units will have the least amount of voltage ripple?

Self wave rectified dental unit
Capacitor discharge mobile unit
Full wave rectified fluoroscopy
Three phase tomographic

Capacitor discharge mobile unit

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12

Which of the following is equal on all electromagnetic radiations?

Frequency
Speed
Amplitude
Wavelength

Speed

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13

Which of the following is NOT a property of x-rays?

Travel in straight lines
Produces biological changes
Travel at the speed of light
Negatively charged

Negatively charged

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14

Which of the following parts would make us the cathode end of the x-ray tube?

Filaments and focusing cup
Filament and rotor
Rotor and rotating disc
Rotor, rotating cup and target

Filament and focusing cup

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15

Which of the following types of current supplies the x-ray tube?

Pulsating direct current

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16

What type of motor drives the rotating anode?

Inductive reactance
Direct current
Inductive
Synchronous

Induction

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17

When electrons strike the target of an x-ray tube moist of their energy is converted to what?

Light
Gamma rays
Heat
X-rays

Heat

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18

Which of the following is most likely to damage the x-ray tube?

High kVp
High mA
Exceeding the tube rating chart
Long exposures

Exceeding the tube rating chart

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19

Where in the X-ray circuit is the timer located?

Between rectifier and x-ray tube
Before the step down transformer
Between autotransformer and step up transformer
In the secondary circuit

Between the autotransformer and step up transformer

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20

Which of the following types of tubes is used in modern radiographic equipment?

Coolidge tube

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21

Which of the following pertains to atoms that have their outer electron shell completely filled?

Chemically inert
Strongly ionized
Tightly bonded
Purely electrified

Chemically inert

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22

What is used to focus the electron stream towards the target of the anode?

Focusing lens
Molybdenum focusing cup
Copper anode
Lead collar

Molybdenum focusing cup

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23

Which of the following electromagnetic waves has the shortest wavelength?

Visible light
Radar
X-ray
Ultraviolet

X-ray

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24

What type of current is supplied to the radiology department?

Alternating
Direct
Three phase
Pulsating Direct

Alternating

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25

Which of the following is correct concerning a neutral atom?

Same number of protons and electrons

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26

What type of radiation is produced after a Compton interaction?

Remnant
Characteristic
Bremsstrahlung
Primary

Characteristic

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27

Why is an x-ray tube immersed in oil?

Insulation

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28

Which of the following subatomic particles is the largest?

Electron
Neutron
Neutrino
Proton

Neutron

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29

Which of the following describes the x-rays that are produced in the radiographic tube?

Secondary radiation
Primary radiation
Remnant radiation
Scattered radiation

Primary radiation

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30

Which of the following refers to the number of electrons in the outer shell of an atom?

Valence number

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31

Which of the following interactions does not occur in the diagnostic x-ray range?

Compton scattering
Photo effect
Unmodified scattering
Pair production

Pair production

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32

Which of the following is smallest?

Actual focal spot
Effective focal spot
Target
Space charge

Actual focal spot

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33

X-rays are very much the same as which of the following?

Gamma rays
Beta particles
String rays
Alpha particles

Gamma rays

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34

Which of the following would cause an element to change to a completely different element?

Addition of a proton

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35

What type of of current flows between the step up transformer and the rectification circuit?

Alternating

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36

What type of primary radiation is produced when the x-ray tube voltage is below 70 kVp?

A. Characteristic
B. Bremsstrahlung
C. compton
D. Scatter

B. Bremsstrahlung

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37

Which of the following will produce the least load on an x-ray tube?

High kVp, high mAs
Low kVp, high mAs
High kVp, low mAs
All will produce equal load

High kVp, low mAs

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38

Which of the following can be used to determine a safe exposure?

Tube rating chart
Schematic chart
Anode cooling curve
Technique chart

Tube rating chart

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39

Which of the following is not essential to the operation of automatic exposure controls?

Image intensifier
Electron emitting device
Back up timer
Capacitor

Image intensifier

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40

Which of these is the negative terminal of an x-ray tube?

Cathode

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41

Which of the following is a byproduct of the photoelectric effect?

Photoelectron

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42

Who invented the first x-ray tube?

Crooke

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43

Which of the following will not reduce the intensity of an x-ray beam?

Characteristic effect

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44

Which of the following increases the penetrating power of the x-ray beam?

Kilovoltage

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45

What type of bond holds atoms together by sharing their outer electrons?

Covalent bonds

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46

Which of the following types of radiation cannot be produced at tube potentials less than 70 kVp?

Characteristic

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47

What is the splitting of an atomic nucleus called

Fission

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48

Which of the following describes a proton?

Mass and positive charge

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49

Which of the following has the greatest effect on radiographic contrast?

Compton scattering
Unmodified scattering
Photoelectric effect
Pair production

Photoelectric effect

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50

Why is an x-ray tube made of Pyrex glass?

Better withstand heat

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51

Which of te following would best describe the wavelength of a diagnostic x-ray beam?

Monoenergetic
Monochromatic
Homogeneous
Heterogeneous

Heterogeneous

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52

Which of the following would describe an x-ray photon?

High speed bundle of energy

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53

Which of the following formulas is correct?

Wavelength = Speed x Frequency
Speed = Frequency x Wavelength
Speed = Wavelength / Frequency
Speed = Frequency / Wavelength

Speed = Frequency x Wavelength

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54

Why is the x-ray tube made from lead impregnated glass and encased in a lead housing?

Absorb leakage radiation

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55

When electrons strike the anode tube on an x-ray tube, how much of their energy is converted to x-rays?

less than 1%

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56

Which of the following is placed in the circuit in case of current changes during the exposure?

Breaker switch

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57

Which of the following causes pitting of the x-ray tube target?

Using both filaments at once
Moderate overloading of the tube
using the small focus all the time
Malfunction of high speed rotor

Moderate overloading of the tube

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58

Which is an advantage of 3 phase equipment over single phase equipment?

Produces less exposure
Can achieve shorter exposure times
less expensive
easier to operate

Can achieve shorter exposure times

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59

Which of the following is NOT an advantage of photo-timers?

Duplicates radiographic densities
Eliminates technique charts
More latitude in patient positioning
Eliminates the need to select mA

More latitude in patient positioning

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60

Which type of radiation is produced when a high speed electron is slowed down or suddenly stopped?

Bremsstrahlung

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61

Where is teh rectification circuit in an x-ray circuit?

Between the step down transformer and the tube

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62

When will a space charge be present in the x-ray tube?

A. Never, it is outside of the tube
B. Whenever the rotor is engaged
C. Whenever the machine is turned on
D. There is always a space charge

Whenever the rotor is engaged

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63

Which is not needed to produce x-rays?

Electrons stopped suddenly
Electrons set in high speed
Focusing cup
Availability of electrons

Focusing cup

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64

When an increase in kilovoltage causes no increase in milliamperage, this is known as what?

Saturation current

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65

Which of the following would not be found in an x-ray tube?

Rotor button

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