Radiation Concepts
The unit of mass is the
kg
The resistance in a wire decreases as its diameter
increases
The function of the cathode is to produce
thermionic cloud
The electrical device used to adjust the mA selection is a/an
variable resistor
The single function of an AEC is to eliminate the need to set
time
The sum of protons and neutrons in a nucleus is called the
mass number
A current of 2 amperes and a resistance of 8 ohms require what voltage in a series circuit?
16 volts
Filament materials are chosen primarily for their
high melting point
In the x-ray circuit, the timing control is found between the
Autotransformer and step-up transformer
When using an AEC, the radiographer loses control of
mAs
The atomic number is the number of ____ contained in the nucleus.
protons
When electric current flows through a wire with resistance, energy is liberated as
thermal energy
The cathode focusing cup has a/an ____ charge.
negative
KvP selector in the x-ray circuit
autotransformer
When more than one ionization chamber is used simultaneously during exposure, the signal is
averaged
If an electron is gained or lost from an atom, that atom becomes
ion
Electric potential is measured in
volts
X-ray photon production occurs at the
anode
Two-position device used to initiate exposure
exposure switch
U.S. public law requires that generators automatically terminate AEC exposures at ____ mAs above 50 kVp.
600
Electrons moving around in specific orbitals demonstrate this energy.
kinetic
A 100 W light bulb with an amperage of 0.91 A is operating at a potential difference of
110 volts
Cracking of the anode typically occurs
when a cold anode is hit with a high kVp exposure.
Regulates exposure time based upon patient thickness and density
AEC
AEC density controls are properly used to
compensate for asymmetrical pathology