Dose Limits Flashcards
(23 cards)
Lens of the eye
150 mSv
Localized areas of the skin, hands, and feet
500 mSv
Cumulative effective dose limit
Age (in years) × 10 mSv
General public: frequent exposure annual effective dose limit
1 mSv
Students older than 18 annual Efd limit
50 mSv
General public: infrequent exposure annual effective dose limit
5 mSv
Embryo-fetus—total equivalent dose for gestation
5 mSv
Embryo-fetus—equivalent dose limit per month
0.5 mSv
Level of negligible risk
0.01 mSv
Dose limit for tabletop fluoro
No more than 100 mGy(a) per minute
Limit use of high-level-control fluoroscopy (HLCF) during interventional procedures
No more than 200 mGy(a) per minute
Provides an approximate skin dose where the x-ray beam is entering the patient; displayed during a fluoroscopic procedure
Air kerma
the total of air kerma striking the surface of the patient
DAP
Thickness recommendations for lead devices have been determined by
NCRP #102
Controlled area: Occupied by persons trained in radiation safety and wearing personnel monitoring devices; shielded to keep exposure under:
1mSv per week
Areas where personnel are not provided radiation exposure monitors (dosimeters) or radiation safety training should be shielded to ensure an effective dose limit to the general public of:
20 μSv per week
Measured in mA minutes per week (mA min/wk); considers the volume and types of exams performed in the room
Workload
Amount of time the beam is on and directed at a particular barrier
Use factor
Leakage radiation may not exceed ____ per hour at a distance of ____ from the housing
1mGya; 1m
At which dose range does GI syndrome peak?
greater than 10 Gy
At which dose range does CNS syndrome peak?
greater than 50 gy
Measures the energy deposited in any material
Gray
includes the relative biologic effectiveness (RBE) specific to the tissue irradiated, and therefore is a valid unit of measure for the dose to biologic material.
Sievert
