Rad Tech Physics

Which part of the nucleus has no charge?

Neutron

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

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

Neils Bohr

X-rays are classified as what type of radiation?


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

Electromagnetic

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

Kilovolt
Milliammeter
Prereading kilovolt
Prereading ammeter

Milliammeter

When were x-rays discovered and by whom?

November 8, 1895 by Wilhelm Roentgen

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

Electron

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

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

Scatter
Speed
Distance
Absorption

Distance

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

Short wavelength
Long wavelength
Low frequency
High speed

Short wavelength

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

Which of the following is equal on all electromagnetic radiations?

Frequency
Speed
Amplitude
Wavelength

Speed

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

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

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

Pulsating direct current

What type of motor drives the rotating anode?

Inductive reactance
Direct current
Inductive
Synchronous

Induction

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

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

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

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

Coolidge tube

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

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

Which of the following electromagnetic waves has the shortest wavelength?

Visible light
Radar
X-ray
Ultraviolet

X-ray

What type of current is supplied to the radiology department?

Alternating
Direct
Three phase
Pulsating Direct

Alternating

Which of the following is correct concerning a neutral atom?

Same number of protons and electrons

What type of radiation is produced after a Compton interaction?

Remnant
Characteristic
Bremsstrahlung
Primary

Characteristic

Why is an x-ray tube immersed in oil?

Insulation

Which of the following subatomic particles is the largest?

Electron
Neutron
Neutrino
Proton

Neutron

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

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

Valence number

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

Compton scattering
Photo effect
Unmodified scattering
Pair production

Pair production

Which of the following is smallest?

Actual focal spot
Effective focal spot
Target
Space charge

Actual focal spot

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

Gamma rays
Beta particles
String rays
Alpha particles

Gamma rays

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

Addition of a proton

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

Alternating

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

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

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

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

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

Cathode

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

Photoelectron

Who invented the first x-ray tube?

Crooke

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

Characteristic effect

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

Kilovoltage

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

Covalent bonds

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

Characteristic

What is the splitting of an atomic nucleus called

Fission

Which of the following describes a proton?

Mass and positive charge

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

Compton scattering
Unmodified scattering
Photoelectric effect
Pair production

Photoelectric effect

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

Better withstand heat

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

Monoenergetic
Monochromatic
Homogeneous
Heterogeneous

Heterogeneous

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

High speed bundle of energy

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

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

Absorb leakage radiation

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

less than 1%

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

Breaker switch

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

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

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

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

Bremsstrahlung

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

Between the step down transformer and the tube

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

Which is not needed to produce x-rays?

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

Focusing cup

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

Saturation current

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

Rotor button