ALARA principles, shielding, and dose limit concepts tested on radiologic technology certification exams.
34 cards · basic cards · AI-written, checked twice. Edit anything.
- What does ALARA stand for?
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As Low As Reasonably Achievable- What are the three main methods to reduce radiation exposure according to ALARA?
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Time, Distance, and Shielding- How does reducing time spent in a radiation field affect dose received?
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Dose is directly proportional to time; less time equals less dose- What is the inverse square law in radiation protection?
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Radiation intensity decreases by the square of the distance from the source- If you double the distance from a radiation source, by what factor is the dose reduced?
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The dose is reduced by a factor of 4- What is the primary purpose of lead shielding in radiologic protection?
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To attenuate (reduce) radiation by absorbing photons- What is a primary barrier?
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A barrier positioned directly in the path of the primary X-ray beam- What is a secondary barrier?
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A barrier that protects against scattered radiation and leakage radiation- What is the annual occupational dose limit for radiation workers recommended by the NCRP?
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5,000 mrem (50 mSv) per year for the whole body- What is the public dose limit recommended by the NCRP?
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100 mrem (1 mSv) per year for the general public- What dose limit applies to a declared pregnant worker?
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500 mrem (5 mSv) for the entire pregnancy once pregnancy is declared- What is the recommended monthly dose limit for the embryo or fetus of a declared pregnant worker?
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Approximately 50 mrem (0.5 mSv) per month- What is the standard thickness of a lead apron worn for radiation protection?
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0.5 mm (one-half millimeter) of lead equivalency- What anatomical area does a thyroid collar protect?
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The thyroid gland from direct and scattered radiation- What is the annual dose limit to the lens of the eye?
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5,000 mrem (50 mSv) per year in occupational settings
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