Principles Of Radiation Physics Flashcards
If used properly, will an X-ray tube last forever?
A. Yes
B. No the anode will disintegrate
C. No the filament wire will break
D. No the focus will melt away
C. No the filament wire will break
Which of the following would describe an X-ray photon?
A. High speed electron
B. High speed neutron
C. High speed proton
D. High speed bundle of energy
D. High speed bundle of energy
What is the unit for radiation exposure in air?
Roentgen
By-products of PE absorption?
- PE
- Characteristic radiation
- Ionized atom
1,2,3
Which of the following statements concerning a series circuit is true?
- Amperage remains constant throughout
- Voltage remains contrast throughout
- Resistance is always constant
1 only (amps remain constant)
Which of the following is the most accurate timer?
A. Impulse timer
B. Synchronous timer
C. Sine wave timer
D. Electronic timer
D. Electronic timer
Unit of force
Newton
In the normal diagnostic range, what is the wavelength range of xrays?
.1 to .5 angstroms
What causes most X-ray tube failures?
Excessive heat
Which of the following parts would make up the cathode end of the X-ray tube?
A. Filament and rotor
B. Rotor and rotating disk
C. Filaments and focusing cup
D. Rotor, rotating disk and target
C. Filaments and focusing cup
What happens when the current in a conductor increases?
Magnetic field strength increases
What is a device called that allows current to flow in only one direction?
Semiconductor
Which of the following is not essential to the operation of the AEC?
A. Capacitor
B. Electron emitting device
C. Back up timer
D. Image intensifier
D. II
What describes a proton?
Mass and positive charge
Electrons travel in an X-ray tube from _______ to _______
Cathode, anode
What is it called when a solenoid has an iron core in its center?
Electromagnet
The work done on a charged particle is measured in which of the following units?
Volt
What is the formula for electrical power?
P=VI
The effective focal spot is _____ than the actual focal spot
Smaller
Which of the following causes electrons to move in a conductor?
A. Voltage
B. Amps
C. Wattage
D. Charge
A. Voltage
What would the current be if the voltage is 12 volt and the resistance is 1.5 ohm?
8 ampere
A device whose electrical resistance may be varied is called what?
Rheostat
What is the voltage supplied to the auto transformer called?
Line voltage
What determines the strength of a magnetic field?
The number of flux lines in an area
Maximum induction will occur when a conductor cuts a magnetic field at what angle?
90 degrees
A technique of 70kv at 400ma produces how many watts of power?
28,000 Watts
Which of the following moves in a conductor?
A. Positive charges
B. Negative charges
C. Neutral charges
D. Atomic nuclei
B. Negative charges
What best describes the wavelengths of a diagnostic X-ray beam?
Heterogeneous
When were xrays discovered?
November 8, 1895
The atomic number of an atom is equal to what?
Number of protons
When will a space charge be present in the X-ray tube?
Whenever the rotor is engaged
What subatomic particle is the largest?
Neutron
How are alternating current values usually expressed?
RMS values
Which of the following materials would make the best transformer core?
A. Plastic
B. AL
C. Wood
D. Soft iron
D. Soft iron
Which part of the X-ray tube has the filament wires and focusing cup?
Cathode
What is a current carrying coil of wire called?
Solenoid
Unit of electrical charge
Coulomb
A ______ works by sending an alternating current through a coil of wire that has been placed within a magnetic field.
Motor
Device that stores electrical charges
Capacitor
What is the purpose of the anode?
Decelerates electrons
Which of the following is NOT a property of xrays?
A. Travel at the speed of light
B. Travel in straight lines
C. Produce biological changed
D. Negativity charged
D. Negatively charged
What type of bond holds atoms together because of their charge?
Ionic
The quality of an X-ray bean refers to what?
Energy of xrays
