RADT Exam Questions and A+ Answers. Latest Released
Update. 2025/2026 Edition.
C
Terms in this set (75)
x-ray exposure is measured in roentgens (R)(mR)(Gya) or C/kg
based on the number of x-ray photons received
measured in roentgens (R)
milliroentgens (mR)(Gya) or C/kg
Also called
radiation quantity or
X-ray Exposure is radiation intensity
Factors contribute to x-ray quantity:
-mAs
(primary)
kV
-Distance
-Filtration
Factors contribute to x-ray quantity:
-mAs
Factors quantity (primary)
kV
-Distance
-Filtration
(Gya) or C/kg
Roentgens unit for measuring radiation
, milliamperes (mA)
mAs (milliampere-seconds) determines how many electrons will be available and
Time (s) is how long electrons will flow from the cathode to the anode
Time (s) (Radiation) how long electrons will flow from the cathode to the anode
the higher the mAs, the higher the mAs,
the more----will be produced the more x-rays will be produced
mAs determines how many mAs determines how many electrons will be
electrons will be --------- and available and how long the electrons will flow
how------------------the electrons
will
flow
mAs primarily controls radiographic density
-overall degree of darkness of an x-ray film
Radiographic Density
mAs increases,
quantity increases
quantity increases
mAs increases
(density
increases)
double density
Double mAs
double radiation exposure
Formula for mAs and intensity I₁/I₂ = mAs₁/mAs₂
I₁/I₂ =
An exposure rate using 110 kVp,
mAs₁/mAs₂
10 mAs results in an intensity of
32/x = 10/20
32 mR/hr.
640 = 10x
What is the new intensity if
640/10 =1 0x/10
mAs is increased to 20
64 = I₂
mAs?
- Controls the penetration power of the beam
- Affect quality of the beam (primarily) but affects quantity as well (secondary)
kVp - As kVp increases, quantity increases
-15% Rule = kV increase by 15% will
double the density, kV decrease by 15%
will decrease the density by 1/2
kV controls the--------power of the kV controls the penetrating power of the beam
beam
quality/contrast of the
kVp primarily affects
beam primarily
quantity/density of the
kVp secondarily affects
Update. 2025/2026 Edition.
C
Terms in this set (75)
x-ray exposure is measured in roentgens (R)(mR)(Gya) or C/kg
based on the number of x-ray photons received
measured in roentgens (R)
milliroentgens (mR)(Gya) or C/kg
Also called
radiation quantity or
X-ray Exposure is radiation intensity
Factors contribute to x-ray quantity:
-mAs
(primary)
kV
-Distance
-Filtration
Factors contribute to x-ray quantity:
-mAs
Factors quantity (primary)
kV
-Distance
-Filtration
(Gya) or C/kg
Roentgens unit for measuring radiation
, milliamperes (mA)
mAs (milliampere-seconds) determines how many electrons will be available and
Time (s) is how long electrons will flow from the cathode to the anode
Time (s) (Radiation) how long electrons will flow from the cathode to the anode
the higher the mAs, the higher the mAs,
the more----will be produced the more x-rays will be produced
mAs determines how many mAs determines how many electrons will be
electrons will be --------- and available and how long the electrons will flow
how------------------the electrons
will
flow
mAs primarily controls radiographic density
-overall degree of darkness of an x-ray film
Radiographic Density
mAs increases,
quantity increases
quantity increases
mAs increases
(density
increases)
double density
Double mAs
double radiation exposure
Formula for mAs and intensity I₁/I₂ = mAs₁/mAs₂
I₁/I₂ =
An exposure rate using 110 kVp,
mAs₁/mAs₂
10 mAs results in an intensity of
32/x = 10/20
32 mR/hr.
640 = 10x
What is the new intensity if
640/10 =1 0x/10
mAs is increased to 20
64 = I₂
mAs?
- Controls the penetration power of the beam
- Affect quality of the beam (primarily) but affects quantity as well (secondary)
kVp - As kVp increases, quantity increases
-15% Rule = kV increase by 15% will
double the density, kV decrease by 15%
will decrease the density by 1/2
kV controls the--------power of the kV controls the penetrating power of the beam
beam
quality/contrast of the
kVp primarily affects
beam primarily
quantity/density of the
kVp secondarily affects
