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Rad Protection Procs
dose limits for radiation exposure
| Question | Answer |
|---|---|
| Dose limit for pregnant technologist: | 0.5 mSv/mo |
| Define major organogenesis. | 2nd week to 10th week of pregnancy. |
| General population dose limit (INFREQUENT) is: | 5 mSv/yr |
| General population dose limit (FREQUENT) is: | 1 MsV/yr |
| Nonoccupationally exposed | 1/10 for that of radiation workers |
| Education and training exposure: | 1 mSv |
| Which cells are most radiosensitive? | Lymphocytes, spermatogonia, erythroblasts |
| Which cells are moderately radiosensitive? | Osteoblasts, spermatids, fibroblasts |
| Which cells have low radiosensitivity? | Muscle and nerve cells |
| What is the dose limit for occupational exposure (effective dose) | 50 mSv/yr |
| What is the fetal dose limit? | 5 mSv for the entire pregnancy |
| Leakage radiation must be less than ___ at a distance of __ from the protective housing. | 100 mR/hr, 1 meter |
| The SID indicator must be accurate to within __% of the indicated SID | 2 |
| The x-ray beam and light beam must coincide to within __% of the SID | 2 |
| The PBL must be accurate to within ___% of the SID | 2 |
| The variation in x-ray exposure should not exceed ___% | 5 |
| The source-to-skin distance must be not less than __ on stationary fluoroscopes and not less than __ on mobile fluoroscopes. | 38, 30 |
| All diagnostic x-ray beams must have a total filtration of at least ____ when operated above 70 kVp | 2.5mm Al |
| Radiographic tubes operated between 50 and 70 kVp must have at least ___ of filtration. | 1.5mm Al |
| Radiographic tubes operated below 50 kVp must at a minimum of ___ total filtration. | 0.5mm Al |
| The image intensifier assembly serves as a primary protective barrier and must be ___ equivalent. | 2mm Pb |
| The total filtration of the fluoroscopic x-ray beam must be at least ___ equivalent. | 2.5mm Al |
| The bucky slot cover for fluoroscopic units should be at least ___ equivalent. | 0.25mm Pb |
| The protective curtain or panel of a fluoroscopic unit must be at least ___ equivalent. | 0.25mm Pb |
| 1/16 of lead is equivalent to ___ inches of masonry. | 4 |
| An area occupied primarily by radiology personnel and patients is called a _________ ____. | controlled area |
| An __________ ______ can be occupied by anyone. | Uncontrolled area |
| The level of radiation activity in a room is known as _______. | workload |
| The percentage of time during which the x-ray beam is on and directed toward a particular wall is called _____ ______. | use factor |
| The instrument of choice for measuring radiation intensity in areas around a fluoroscope is called the _________ ________. | ion chamber |
| Design limits for a controlled area are based on the annual recommended dose limit of ____________. | 50 mSv/yr |
| _______________ is the emission of light by a thermally stimulated crystal following irradiation. | TLD (thermoluminescence dosimetry) |
| __________ __________ is the most widely used TLD material. | Lithium fluoride |
| True or false: The TLD can only be used once. | False |
| Entrance skin exposure is most often referred to as ____________ ___________. | Patient dose |
| A reduction in either noise or slice thickness, while other factors remain constant, _________ patient dose. | increase |
| TLDs can be worn for intervals up to _______ | One year |
| TLDs are available as ________, ________, _____ and ________. | Chips, disks, rods, powder |
| _________ speed rather than _________ speed controls patient dose. | Screen, film |
Created by:
rad1958tech
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