LMRT CORE - RADIATION & SAFETY Exam 2026/2027 | Actual
Questions and Answers Latest Updated 2026/2027 (Graded A+)
•
high potential difference
- ✔✔Required to move the electron stream rapidly across the X-ray tube/ VOLTAGE
•
Unit of potential difference
- ✔✔Volts
•
patient dose:
- ✔✔calculated as ESE (entrance skin exposure)
•
Transformer that has more windings on primary side:
- ✔✔step-down
•
Factors that affect xray QUALITY:
- ✔✔kvp & filtration
•
How does scatter rad fog reduce visability of detail in image?
- ✔✔it decreases contrast
•
Contrast is directly influenced by:
- ✔✔fog & collimation
•
What minimizes shape distortion?
i. - ✔✔- position plane of subject parallel to IR
ii. - position CR perp to IR and subject
•
Prime factors for exposure:
i. - ✔✔milliamperage
ii. exposure time
iii. kvp
iv. SID
•
Precise area of target where xray beam strikes:
, - ✔✔actual focal spot
•
inverse square law
- ✔✔intensity of xray beam is inversely proportional to the square of the distance
•
Essential elements for xray production:
i. - ✔✔a target
ii. a vacuum
iii. an electron source
iv. a high potential difference
•
kvp increases then Compton scatter:
- ✔✔increases
•
What reduces amt of scatter radiation fog on xray?
- ✔✔decrease kvp
•
Lead equivalent for protective aprons
- ✔✔0 5 mm
•
scatter radiation fog will:
i. - ✔✔increase density
ii. decrease contrast
iii. reduce visibility of detail
•
Velocity
- ✔✔electromagnetic energy mixes through space at this rate
•
if mA doubles, QUANTITY of exposure:
- ✔✔doubles
•
annual effective dose limit
- ✔✔.50 msv
•
When incoming photon interacts with atom in its body:
- ✔✔creates photoelectric effect / its totally absorbed by the atom
Questions and Answers Latest Updated 2026/2027 (Graded A+)
•
high potential difference
- ✔✔Required to move the electron stream rapidly across the X-ray tube/ VOLTAGE
•
Unit of potential difference
- ✔✔Volts
•
patient dose:
- ✔✔calculated as ESE (entrance skin exposure)
•
Transformer that has more windings on primary side:
- ✔✔step-down
•
Factors that affect xray QUALITY:
- ✔✔kvp & filtration
•
How does scatter rad fog reduce visability of detail in image?
- ✔✔it decreases contrast
•
Contrast is directly influenced by:
- ✔✔fog & collimation
•
What minimizes shape distortion?
i. - ✔✔- position plane of subject parallel to IR
ii. - position CR perp to IR and subject
•
Prime factors for exposure:
i. - ✔✔milliamperage
ii. exposure time
iii. kvp
iv. SID
•
Precise area of target where xray beam strikes:
, - ✔✔actual focal spot
•
inverse square law
- ✔✔intensity of xray beam is inversely proportional to the square of the distance
•
Essential elements for xray production:
i. - ✔✔a target
ii. a vacuum
iii. an electron source
iv. a high potential difference
•
kvp increases then Compton scatter:
- ✔✔increases
•
What reduces amt of scatter radiation fog on xray?
- ✔✔decrease kvp
•
Lead equivalent for protective aprons
- ✔✔0 5 mm
•
scatter radiation fog will:
i. - ✔✔increase density
ii. decrease contrast
iii. reduce visibility of detail
•
Velocity
- ✔✔electromagnetic energy mixes through space at this rate
•
if mA doubles, QUANTITY of exposure:
- ✔✔doubles
•
annual effective dose limit
- ✔✔.50 msv
•
When incoming photon interacts with atom in its body:
- ✔✔creates photoelectric effect / its totally absorbed by the atom
