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