LXMO Exam
Questions with
Complete Solutions
Graded A+
Denning [Date] [Course title]
, Rectification Constant - Correct Answer: A value of the heat unit formula that varies depending on the
generator used.
Generators used in Radiography - Correct Answer: single phase generator delivers pulsating x-ray beam
(1), Three phase generator = 3 phase 6 pulse machine (1.35) , High frequency generator = 3 phase 12
pulse machine (1.41)
Rectification - Correct Answer: The rectifier of the x-ray tube changes alternating current (AC) to direct
current (DC). This process ensures that the x-ray production flows in the right direction; from the
filament to the target.
Heat Unit (HUs) Formula - Correct Answer: KVP x MA x Time x (rectification constant) = HUs
Cumulative MPD - Correct Answer: Cumulative Maximum Permissible Dose is the total amount of
radiation that an x-ray worker could have been exposed to since the age of 18 according to NCRP
(National Council on Radiation protection.)
Cumulative MPD Formula - Correct Answer: CMPD = 5 (N-18) The "N" in the equation refers to the
current age of the worker, always subtract 18 from the current age before multiplying by 5. 5 refers to
the number of REMS per year that is max for worker.
Inverse square law - Correct Answer: The closer you are to the source of radiation, the more exposure
you will receive and vice-versa. As distance increases, exposure decreases; as distance decreases,
exposure increases.
Inverse square law formula - Correct Answer: i1/ i2 = (D2)2 / (D1)2 i2 will be the unknown (x). To make it
easier to solve, square the values first the cross multiply and divide.
Ampere "A" - Correct Answer: Unit used to measure the rate, or volume, of current flow in the circuit. X-
ray circuit contains 0.3 A
Potential Difference - Correct Answer: Is the force or speed of the electron flow in the current. The volt
"V" is used to measure the potential difference. x-ray circuit contains 120,000V
Questions with
Complete Solutions
Graded A+
Denning [Date] [Course title]
, Rectification Constant - Correct Answer: A value of the heat unit formula that varies depending on the
generator used.
Generators used in Radiography - Correct Answer: single phase generator delivers pulsating x-ray beam
(1), Three phase generator = 3 phase 6 pulse machine (1.35) , High frequency generator = 3 phase 12
pulse machine (1.41)
Rectification - Correct Answer: The rectifier of the x-ray tube changes alternating current (AC) to direct
current (DC). This process ensures that the x-ray production flows in the right direction; from the
filament to the target.
Heat Unit (HUs) Formula - Correct Answer: KVP x MA x Time x (rectification constant) = HUs
Cumulative MPD - Correct Answer: Cumulative Maximum Permissible Dose is the total amount of
radiation that an x-ray worker could have been exposed to since the age of 18 according to NCRP
(National Council on Radiation protection.)
Cumulative MPD Formula - Correct Answer: CMPD = 5 (N-18) The "N" in the equation refers to the
current age of the worker, always subtract 18 from the current age before multiplying by 5. 5 refers to
the number of REMS per year that is max for worker.
Inverse square law - Correct Answer: The closer you are to the source of radiation, the more exposure
you will receive and vice-versa. As distance increases, exposure decreases; as distance decreases,
exposure increases.
Inverse square law formula - Correct Answer: i1/ i2 = (D2)2 / (D1)2 i2 will be the unknown (x). To make it
easier to solve, square the values first the cross multiply and divide.
Ampere "A" - Correct Answer: Unit used to measure the rate, or volume, of current flow in the circuit. X-
ray circuit contains 0.3 A
Potential Difference - Correct Answer: Is the force or speed of the electron flow in the current. The volt
"V" is used to measure the potential difference. x-ray circuit contains 120,000V
