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Rad Protection Procs

dose limits for radiation exposure

QuestionAnswer
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 on 2008-04-27



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