RAD 140: Rad Bio - Ch 36| 72 Question Quest With Answers: Test Your Knowledge and Skills
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Course
RAD 140: Rad Bio
Institution
RAD 140: Rad Bio
DAP is expressed in cGy-cm2 (R-cm2). - ️️_________ is a quantity that reflects not only the dose but also the volume of tissue irradiated; therefore, it may be a better indicator of risk than dose.
dosimetry
dosimeters. - ️️The measure of radiation intensity is called _______, and the r...
RAD 140: Rad Bio - Ch 36| 72 Question
Quest: Test Your Knowledge and Skills
DAP is expressed in cGy-cm2 (R-cm2). - ✔ ✔ _________ is a quantity that reflects not only the dose
but also the volume of tissue irradiated; therefore, it may be a better indicator of risk than dose.
dosimetry
dosimeters. - ✔ ✔ The measure of radiation intensity is called _______, and the radiation measuring
devices are called ___________
drywall or wood paneling - ✔ ✔ Lead bonded to __________ or __________ is used most often as a
primary protective barrier. Such lead shielding is available in various thicknesses and is specified for
architects and contractors in units of pounds per square foot (lb/ft2).
effective radiation dose (E) - ✔ ✔ The overall stochastic risk to a patient depends on
_____________________, which is related to tissue radiation dose and to the volume of tissue exposed.
Tissue radiation dose, which refers to the energy deposited locally, is the quantity that best reflects the
potential for injury to that tissue (deterministic effect).
energized
hese requirements are usually satisfied with the use of kVp and mA indicators. Sometimes, visible or
audible signals indicate when the x-ray beam is energized. - ✔ ✔ The control panel must indicate the
conditions of exposure and must positively indicate when the x-ray tube is _____. T
field size
lower - ✔ ✔ DAP increases with increasing _______ even if the dose remains unchanged. Smaller
field size results in __________ DAP, and thus less risk, because a smaller amount of tissue is exposed.
fluoroscopy. - ✔ ✔ Radiologic technologists receive most of their occupational radiation exposure
during ____________
The intensity of the x-ray beam at the tabletop of a fluoroscope should not exceed 21 mGy/min (2.1
R/min) for each mA of operation at 80 kVp. If there is no optional high-level control, the intensity must
not exceed 100 mGy/min (10 R/min) during fluoroscopy. If an optional high level control is provided, the
maximum tabletop intensity allowed is 200 mGy/min (20 R/min).
, There is no limit on x-ray intensity when the image is recorded, as in cineradiography or videography.
don't need to know formula
- ✔ ✔ Fluoroscopic Protection Features
• PrimaryProtectiveBarrier • Filtration
• Collimation
• ExposureControl
• BuckySlotCover
• CumulativeTimer • DoseAreaProduct
- ✔ ✔ Fluoroscopic x-ray beam collimators must be adjusted so that an unexposed border is visible
on the image monitor when the input phosphor of the image intensifier is positioned 35 cm above the
tabletop and the collimators are fully open. For automatic collimating devices, such an unexposed
border should be visible at all heights above the tabletop. The collimator shutters should track with
height above the tabletop.
- ✔ ✔ It must not be possible to expose an image receptor while the radiologic technologist stands
unprotected outside a fixed protective barrier, usually the console booth. The exposure control should
be fixed to the operating console and not to a long cor
- ✔ ✔ It must not be possible to expose an image receptor while the radiologic technologist stands
unprotected outside a fixed protective barrier, usually the console booth. The exposure control should
be fixed to the operating console and not to a long cord
- ✔ ✔ know you can request that the amount of barrier can be reduced. usually physisist does
it.also know what they mean
dont need to know much into detail.
- ✔ ✔ Light-localized, variable-aperture rectangular collimators should be provided. Cones and
diaphragms may replace the collimator for special examinations. Attenuation of the useful beam by
collimator shutters must be equivalent to attenuation by the protective housing.
- ✔ ✔ The use of the area that is being protected is of principal importance.
• Leakage radiation
• Scatter radiation - Steel
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