Rad Protection, Filtration
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| What are the two types of dosimeters? | Field survey instruments and personnel monitoring devices
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| The OSL contains a thin strip of _______ ________. | Aluminum oxide
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| The OSL can report doses from as low as _________ with a precision of +/- 1 mrem. | 1 mrem
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| When a film badge is exposed to radiation, the ___ ______ darkens in proportion to the degree of radiation exposure received. | Film emulsion
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| A film badge's density can be measured with a(n) ___________. | Densitometer
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| What 3 metals are used as filtering metals in a film badge? | Aluminum, Cadmium, and Copper
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| Film badges can measure exposures in the range of approximately _____ to ___________. | 10 mrem (0.1 mSv) to 2000 rem (20 Sv)
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| The thermoluminescent dosimenter (TLD) contains small chips of ________ ________. | Lithium fluoride
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| The measuring capabilities of the TLD are ____________ to those of a film badge. | Similar
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| An advantage of the pocket dosimeter is _________ ____________. | Immediate readout
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| In dosimetry reporting, the radiation exposure reading is expressed in ______. | Millirem
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| What is the synonym for deterministic? | Nonstochastic
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| Stochastic effects are those for which _____ _____ dose of radiation exists. | No threshold
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| Examples of stochastic effects are? | Cancer, genetic effects
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| Deterministic effects are those for which _____ ________ is assumed. | threshold dose
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| Examples of deterministic effects include? | Cataracts, skin erythema, sterility
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| ________ barriers can be struck by useful beam exiting the x-ray tube. | Primary
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| ____________ barriers can only be struck by scattered and leakage radiation. | Secondary
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| __________ barriers are always thinner than __________ barriers. | Secondary, primary
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| Protective aprons must possess a minimum of ________ lead equivalent. | 0.5 mm
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| Lead gloves must possess _________ lead equivalent. | 0.25 mm
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| Increasing kVp alone will __________ patient dose. | Increase
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| To reduce patient dose, a(n) __________ must be accompanied by a reduction in mAs to maintain an acceptable exposure. | Reduction
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| The NCRP recommends a minimum total filtration of ____________ for x-ray equipment operating above 70 kVp. | 2.5 mm Al/Eq
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| When filtration is increased, technical factors need to be ____________. | Increased
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| The monthly equivalent dose limit for an embryo should not exceed _______ once pregnancy is known. | 0.05 rem/50 mrem/0.5 mSv
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| The dose equivalent to the embryo/fetus during the entire pregnancy of a declared pregnant woman cannot exceed __________. | 5 mSv/500 mrem
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| The _______ _________ states that elective abdominal x-ray examinations of fertile women should be postponed until the 10-day period following the onset of menstruation. | 10-day rule
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| __________ is the process of eliminating undesirable low-energy x-ray photons by insertion of absorbing materials into the primary beam. | Filtration
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| Filtration is also known as _________________. | Hardening the beam
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| _______ _________ __________ is that amount of absorbing material that will reduce intensity of the primary beam to one-half its original value. | Half-value layer
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| A typical x-ray tube might have a total inherent filtration of _______ to _________ Al/Eq. | 0.5, 1.0 mm
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| Collimators average ____________ Al/Eq | 1.0mm
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| Compound filters place the _________ atomic number material closest to the tube and the ___________ atomic number material closest to the patient. | Highest, lowest
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| An example of a compound filter is the ____ filter. | Thoreaus
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| A ________ filter is designed to solve problems involving unequal subject densities. | Compensating
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| The _______ portions of the filter are matched to the ______ ________ body parts. | Thicker, less dense
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| A T-spine and venography would employ a ______ filter. | Wedge
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| A ______ filter is useful to even density differences between the mediastinum and the lungs on a chest x-ray. | Trough
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Created by:
rad1958tech