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LMRT CORE / RADIATION & SAFETY EXAM 2025 QUESTIONS AND ANSWERS

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High potential difference - ANS Required to move the electron stream rapidly across the X- ray tube/ VOLTAGE Unit of potential difference - ANS Volts patient dose: - ANS calculated as ESE (entrance skin exposure) Transformer that has more windings on primary side: - ANS step-down Factors that affect xray QUALITY: - ANS kvp & filtration How does scatter rad fog reduce visability of detail in image? - ANS it decreases contrast Contrast is directly influenced by: - ANS fog & collimation What minimizes shape distortion? - ANS - position plane of subject parallel to IR - position CR perp to IR and subject Prime factors for exposure: - ANS milliamperage exposure time

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Uploaded on
July 26, 2025
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  • lmrt core radiation safety exam 2025 questions

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LMRT CORE / RADIATION & SAFETY
EXAM 2025 QUESTIONS AND ANSWERS


High potential difference - ANS Required to move the electron stream rapidly across the X-
ray tube/ VOLTAGE



Unit of potential difference - ANS Volts



patient dose: - ANS calculated as ESE (entrance skin exposure)



Transformer that has more windings on primary side: - ANS step-down



Factors that affect xray QUALITY: - ANS kvp & filtration



How does scatter rad fog reduce visability of detail in image? - ANS it decreases contrast



Contrast is directly influenced by: - ANS fog & collimation



What minimizes shape distortion? - ANS - position plane of subject parallel to IR
- position CR perp to IR and subject



Prime factors for exposure: - ANS milliamperage
exposure time
kvp
1 Copyright ©2025 SIRJOEL ALL RIGHTS RESERVED

, SID



Precise area of target where xray beam strikes: - ANS actual focal spot



inverse square law - ANS intensity of xray beam is inversely proportional to the square of the
distance



Essential elements for xray production: - ANS a target
a vacuum
an electron source
a high potential difference



kvp increases then Compton scatter: - ANS increases



What reduces amt of scatter radiation fog on xray? - ANS decrease kvp



Lead equivalent for protective aprons - ANS 0 5 mm



scatter radiation fog will: - ANS increase density
decrease contrast
reduce visibility of detail



Velocity - ANS electromagnetic energy mixes through space at this rate



if mA doubles, QUANTITY of exposure: - ANS doubles



annual effective dose limit - ANS .50 msv
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