Board Prep- Rad Safety Flashcards
Radiation Safety (30 cards)
What reduces patient dose, improves image quality, & reduces scatter production?
Beam Restriction
The NCRP regulations state manual collimators must be w/in __% of the SID.
2
The purpose of ___ is to reduce patient skin dose.
Filtration
The NCRP regulations state equipment operating above 70 kV must have total minimum of __ mm/Al equivalent.
2.5
A grid w/ a ratio of __ is recommended for exams using more than 100 kV.
16:1
What principle is demonstrated: when testing mA stations & keeping constant exposure time, twice the mAs should produce twice the exposure.
Linearity
What is the annual occupational exposure dose-equivalent limit?
50 mSv
Undertable bucky slot covers in fluoroscopic rooms require at least the equivalent of __ available.
0.25mm/pb
What type of radiation barrier are the lead walls and doors in an imaging room?
Primary radiation barrier
The leaded glass shield in the control booth should contain __ equivalent.
1.5mm pb
What are the cardinal principles of radiation protection?
Time, Distance, and Shielding
The NCRP regulations state SSD should not be less than __ for all procedures other than dental radiography.
12 inches
The equivalent of traditional unit rem is the ___ in the SI.
Sievert
A TLD can measure radiation doses as low as __ mrem.
5
1 Gy equals __ rad.
100
The annual dose limit of the general population is __ mSv per year.
5
The cumulative exposure for an occupationally exposed individual who is 40 years old must not exceed __ mSv.
400
For pregnant radiographers, the gestational dose limit to the fetus during the gestational period must not exceed __ mSv.
5
What interaction with matter contributes to quantum mottle in an x-ray image?
Compton Scatter
An atom containing 6 protons and 6 neutrons in it’s nucleus has an atomic number of what?
6
Secondary radiation barriers must contain a minimum thickness of __ pb equivalent.
1/32 inches
If linear energy transfer (LET) increases, what effect occurs on relative biologic effectiveness (RBE)?
It also increases (direct relationship)
If a male patient experiences sterility after excessive radiation exposure to the gonads, they are experiencing what type of radiation effect?
Local somatic
Of the following, which is NOT considered a short-term somatic effect: epilation, erythema, cataracts, & epistaxis.
Cataracts
