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Rad. protection

ARRT exam review: radiation protection

QuestionAnswer
What is the monthly gestational dose limit for the embryo fetus of a pregnant radiographer? 5mSv
The interaction between ionizing radiation and the target molecule that is most likely that is most likely to occur is? indirect effect
Occupational radiation monitoring is required when it is possible that the individual might recieve more than? 1/10 the annual dose limit
Define radiolysis. irraditaion of water molecules within the body resulting in breakdown.
The exposure rate to a body 4ft from a source of radiation is 16 R/h. What distance from the source would be necessary to decrease the exposure to 6 R/h? 7 ft.
A thermoluminescent dosimetery system would use what type of crystal? lithium fluoride
Name three late radiation-induced late effects. thyroid cancer, cataractogenesis, genetic mutations
What contributes the most to occupational exposure? compton scatter
How will x-ray photon intensity be affected if the SID is doubled? the intensity decreases 4 times.
Medical and Dental radiation accounts for what percentage of the general public's exposure to human-made radiation? 90%
Immature cells are referred to as a)undifferentiated cells b)stem cells c) genetic cells A and B
The annual dose for occupationally exposed individuals is valid for what types of radiation? beta, gamma, x-radiation
How does filtratino affect the primary beam? it increases the average energy of the primary beam.
What unit of measre is used to express ionizing radiation dose to biologic material? Rem (Sv)
Biologic material is least sensitive to irraditaion under what conditions? anoxic (unoxygenated)
What does-response relationship represents radiation-induced leukemia and genetic effects? linear, nonthreshold
Patient dose increases as fluoroscopic FOV A)increases B) Decreases B)decreases
Diagnostic x-ray may be correctly described as low energy, low LET
How thick do primary radiation barriers have to be? 1/16" lead
For radiographic exams of the skull it is generally preferred that the skull be examined in what postition? (ex. AP, erect, PA, supine) PA
The annual occupational dose-equivalent limit (50 rem) to the thyroid, skin, and extremities is how many mSv? 500 mSv
What type of x-ray does aluminum filtration have its greatest effect on? low-energy x-ray photons
The law of Bergonie and Tribondeau states that cells are more radiosensitive if they are a) highly proliferative b)highly differentiated c)immature A and C
Why is the bucky slot cover in place? to protect the fluoroscopist and technologist
What term is used to describe the x-ray beam quality? HVL
Filters used in radiographic x-ray tubes generally are composed of? aluminum
The photoelectric effect is an interaction between an x-ray photon and what? an inner-shell electron
Created by: kngeorgeff