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Rad Protection

Agencies and Regulations

QuestionAnswer
The agency that developed the units of measurement ICRP- Intl Commission on Radiological Protection
THe agency that creates the standards for radiation protection, is not an enforcement agency NCRP - National council on Radiation protection and measurements
The agency that enforces the radiation protection standards NRC- Nuclear Regulatory Agency
Unit of measurement that measures radiation in the air ; used with machines Roentgen
RAD Radiation absorbed dose
Equates the biological damage of any form of radiation to x-ray and gamma ; used on dosimetry reports REM - roentgen equivalent man
-the sequence of events following high level exposure to radiation that leads to death within days or weeks acute radiation syndrome
Which type of barrier: 1/16" lead equ 7 ' high primary barrier
Which type of barrier: 1/32 " lead equ 1/2" overlap secondary
How many times must the beam scatter before entering the control booth? twice
What is the min filtration if using above 70 kVp? 2.5 mm Al equiv
What is the min filtration if using 50-70 kVp? 1.5 mm Al equiv
What is the min filtration if using below 50 kVp? 0.5 mm Al equiv
Occupational EDE annual limt 50 mSv / 5 Rem
Occupational EDE cummulative limit 10 mSv x age / 1 rem x age
occupational EDE for lens of eye 150 mSv / 15 Rem
occupational EDE for all other organs 500 mSv / 50 Rem
public exposures continuous/frequent 1 mSv / 0.1 Rem
public exposures infrequent 5 mSv / 0.5 Rem
public exposure lens of eye 15 mSv / 1.5 Rem
public exposure skin, hands, feet 50 mSv / 5 rem
Exposure for the public is what % allowed for an occupational worker? 10%
education and training under 18 EDE limit 1 mSv / 0.1 rem
education and training under 18 EDE lens of eye 15 mSv / 1.5 rem
education and training under 18 EDE skin, hands, feet 50 mSv / 5 rem
EDE mothly allowance for embryo-fetus 0.5 mSv / 0.05 rem
When doing moblie radiography, how far away should the technologist stand from the patient and the machine when making an exposure? 6 '
What is the max exposure rate at tabletop for fluoroscopy? 2.1 R / Min for each mA of operation at 80 kVp
Under no circumstances should the exposure exceed what? 10 R / min
What is the max avg mA of current during fluoro? 2-4 mA
During fluoro min total filtration should be? 2.5 mm Al
If using 5 mA at 3 min what is the exposure rate? 3(2.1) = 6.3 6.3(5) = 31.5
For every milliamp of fluoroscopic technique, one can assume a tabletop intensity of? 2 rad / min
How much radiation would be produced at 4 mA and 3 mins of exposure? 2(3) = 6 6(4) = 24
95% of all occupational exposure comes from what? Fluoro and portable
The neck will receive up to ___ times more radiation than at the waist. 20
Min distance for fluoroscopy tube to tabletop for a stationary unit is? not less than 38 cm / 15"
Min distance for fluoroscopy tube to tabletop for a mobile unit is? not less than 30 cm / 12"
Bucky slot cover should have ___ mm Pb equiv 0.25
What criteria should the protective curtain meet? 0.25 mm Pb equiv 45 cm x 45 cm
What is the min Pb requirements for aprons and gloves? What is most common? 0.25 mm 0.50 mm
Why is 0.50 most commonly use for aprons and gloves? bc there is 88% attenuation at 75 kVp
What is the min Pb equiv for eye shields? 0.35 mm
What is the min Pb equiv for thyroid shields? 0.50 mm
WHat is the measure of beam quality? HVL - half value layer
-that amt of specified material that will reduce the intensity of the beam to 1/10 its initial value -used when talking about primary barrier protection Tenth value layer - TVL
-there is no dose so low that a person has a negligible chance of sustaining biological change non-threshold
-a dose below which a person has a negligible chance of sustaining biological change threshold
The avg genetic dose for the population should not exceed what? 170 mRem / yr
The max allowable radiation leakage from diagnostic tube housing is? 100 mR / hr at a distance of 1 meter
PBL of the collimator must be accurate to within __ % of the SID 2
PBL of the collimator must have no more than __ % variation for reproducibility. 5
PBL of the collimator must have no more than __ % variation for linearity. 10
When should a " Caution Radiation Area" sign be used? where the prevailing exposure rate is more than 5 mR / hr but less than 100 mR / hr
When should a " Caution High Radiation Area" sign be used? Where the exposure rate is greater than 100 mR / hr
List from highest gonadal dose to lowest for a male: IVP, Pelvis, Lumbar Spine, abdomen Pelvis, lumbar spine, IVP abdomen
List from highest gonadal dose to lowest for a female: Abdomen, Pelvis, Lumbar Spine, IVP Lumbar Spine, IVP, abdomen, Pelvis
A min distance of __ cm must be btwn the collimator and the pt's skin 15 cm
Suggested wkly MPD for a radiographer is? 100 mRem
A __ % increase in congenital abnormality is est to follow a 10 rad exposure. 1
The intensity of scatter radiation 1 meter from the pt is __% of the intensity of the useful beam at the pt. 0.1
___ kVp and ___ mAs technique give the lowest pt dose. high, low
What is the first step in providing gonadal protection must be to ? properly collimate the beam
Gonad shields should be used when the gonads lie in the direct beam or within __ cm of the direct beam. 5
When are flat contact shields used? AP and PA
When are shaped shields used? for upright, oblique, lateral
When are shadow shields used? around sterile fields
Created by: erikasmith28