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Chapter 7 radbio
| Question | Answer |
|---|---|
| Repeats range from _______ to _______ | 5-15% |
| Name 3 types of beam limiting devices | Diaphragms, cones, collimators |
| What is the most commonly used variable Aperture collimators composed of??? | Upper and lower pair of shutters |
| Collimators accuracy must be in _____% of the SID | 2 |
| The minimum total filtration for mobile diagnostic and fluoro units is ____ | 2.5mm Al eq |
| Define half value layer | The thickness of the material that will reduce he xray intensity to half its original value |
| Gonadal shielding requirements | Shield reproductive organs when they are in or near 5 cm of a properly Collimatored beam |
| What are three types of gondal shields | Flat, shadow, and shaped |
| Shaped shields | Worn by male patients and held in place by disposable supporter. The shield is placed into a pouch inside the supporter. Can reduced male gonadal exposure by 90% rarely used today |
| Contact shield | Minimum of 1mm Pb will absorb 95-99% of primary Rays in 50-100kvp. Can reduce female exposure by 75% made of lead strips useful for recumbent exams |
| Shadow shield | Attached to Collimator so it's placed between the tube and patient. Casts a shadow of the part. Perfect for scoli series |
| How much lead required in glasses | .35mm |
| How much lead requires in thyroid shield | .5mm |
| How much lead required in gloves | .25mm |
| Pregnancy total effective dose limit | .5rem |
| Pregnancy effective dose limit for one month | .05 rem |
| Where should the fetal dosimeter be worn during fluoro | Inside gown at waist level |
| Maternity aprons must contain what lead apron specifications | .5mm all over 1mm from xiphoid to symphysis |
| Spot filming device. Front and rear loading. Which is safer? | Front loadin |
| Fluoro source to table top distance is a minimum of | 15inches |
| Fluoro filtration requirement is | 2.5mm Al |
| Image intensifier acts as a protect barrier and should be at least ____mm Pb | 2 |
| How long is the cumulative timer for fluoro | 5min |
| Fluoro intensity at tabletop must not exceed | 10R/min |
| Define inverse square law | Intensit of radiation at a given distance is inversely proportional to the square of the distance of the object from the source |
| Xray attenuation at 75kvp for a 1mm Pb equivalent apron is ____% | 99 |
| Xray attenuation at 75kvp for .5mm Pb equivalent apron is _____% | 90 |
| Define "controlled area" | Is an area occupied by radiation personnel designed to reduce exposure to less than 100mrem/week |
| Define "uncontrolled area" | |
| What factors determine productive barrier thickness? | Time of occupancy, workload, useage |
| The X-ray tube must be enclosed by a lead lining that must be how thick? | 1.5mm 1/16" Pb |
| Tube leakage should not exceed | 10mR/her @ 3' |
| Control booth are considered to be ________ barrier. X-rays have scattered at least ____ times before hitting the control booth reducing the beam to _____-______ of its original value | Secondary, 2, one-millionth |
| Where is the secondary barrier located? | Parallel to line of travel of xray beam |
| How thick should the secondary barrier be? | 1/32" Pb or equiv. plaster or concrete often serves as a secondary barrier without added lead |
| Average lead glass for control booth is _____mm of Pb | 1.5 |
| Windows can be obtained in thicknesses of ______-______mm of Pb | .3-2 |
| Lead glass is typically _____ times as thick as a sheet lead equivalent protection | 4 |
| Observation glasses should have the same lead equiv as _____ | Adjacent wall |
Created by:
Aborys88