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Rad Protection
Personnel Protection
| Question | Answer |
|---|---|
| What is the occupational dose limit per yr? | 50 mSv / 5 Rem |
| What is the non0occupational dose limit? | 5 mSv / 0.5 Rem |
| What type of procedures increase the radiographer's risk of exposure? | fluoro, iv procedures, mobile |
| This should be perpendicular to the line of travel of the primary beam. | primary barrier |
| These are examples of what: chest wall in an R & F room, door, floor, lateral walls | primary barrier |
| This provides protection for secondary radiation only and is located parallel to the direction of the primary beam | secondary barrier |
| These are examples of what kind of barrier: control booth, any wall in a CT room | secondary barrier |
| Which type of barrier must be: 1/16 " Pb eq and 7 ft high | primary |
| What type of barrier must be: 1/32" Pb eq? | Secondary barrier |
| What is another feature of secondary barrier, besides the 1/32" Pb eqv? | It must overlap the primary barrier by at least 1/2" |
| What is the require for windows as barriers? | must be 1.5 mm Pb eq thickness |
| How many times must radiation scatter before entering the control booth? | two times |
| What is the maximum allowable leakage from the tube housing? | 100 mR / hr at a distance of 1 meter |
| What protection requirements should the drape offer? | 0.25 mm lead eqv for a 45cm x 45cm area |
| What type of exposure cord should be short enough so that the exposure can be operated only when the radiographer is completely behind the control booth? | fixed |
| What type of exposure cord should be long e nough to allow the radiographer to stand at least 2 meters (6ft) from the x-ray tube? | mobile |
| MPD for the technologist is? | 50 mSv (5Rem) / yr 100 mRem / wk |
| WHat is the min thickness of the lead aprons? What is most commonly used? | 0.25 mm 0.50 |
| THe most commonly used thickness for lead aprons, provides what percentage attenuation? | 88% @ 75 kV |
| Min thickness of lead gloves? | 0.25 mm |
| Min thickness of neck & thyroid shield? | 0.50 mm |
| What is the min thickness for protective eyeware? | 0.35 mm |
| Where should the radiographer stand to the scattering object? | at right angles |
| What is the intensity of scatter radiation 1 meter from the pt? | 0.1 % of the intensity of the useful beam at the pt |
| During which portion of pregnancy could resorption of the embryo happen? | first 2 wks |
| During which portion of pregnancy could major organogenesis-organ deformities-mainly skeletal happen? | from 2nd - 8th wk |
| During which part of pregnancy could the radiation cause leukemia or cancer? | first trimester |
| What stage of pregnancy is the most radiosensitive? | first trimester |
| What stage of pregnancy is the most resistant stage? | third trimester |
| What percentage increase in congenital abnormality is est to follow a 10 rad exposure? | 1% |
| Fetal exposure should be kept at what during the entire gestation period? | 500 mRem ( 5 mSv) |
| For a declared pregnant worker, exposure should not exceed? | 50 mRem / mth |
Created by:
erikasmith28
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