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RADT456:Rad.Protecti

ARRT Registry Review

QuestionAnswer
The monthly gestational dose-equivalent limit for embryo/fetus of a pregnant radiographer is what? 5 mSv (pg. 135)
What cell type has the greatest radio sensitivity in the adult human? Lymphocytes (pg. 136)
What is the established annual occupational dose-equivalent limit for the lens of the eye? 150 mSv (pg. 136)
What is radiolysis? Irradiation of water molecules within the body and their resulting breakdown. (pg. 136)
What contributes most to occupational exposure? Compton Scatter (pg. 137)
Compton Scatter is defined as? An x-ray interaction with matter that is responsible for the majority of scatter radiation reaching the image receptor. (pg. 137)
According to the NCRP, the annual occupational whole-body dose-equivalent limit is what? 50 mSv (pg. 137)
What is recommended for a pregnant radiographer? Wear a second dosimeter under the lead apron. (pg. 138)
Medical and dental radiation accounts for what percentage of the general public's exposure to human-made radiation? 90% (pg. 138)
How does filtration affect the primary beam? It increases the average energy of the primary beam. (pg. 139)
What is the minimum lead requirement for lead aprons, according to the NCRP? .50 mm Pb (pg. 139)
Immature cells are referred to as what? Undifferentiated and Stem Cells (pg. 139)
Define Scattering Term used to describe x-ray photon interaction with matter and the transference of part of the photons energy to matter (pg. 139)
Primary radiation barriers must be at least how high? 7 ft. (pg. 139)
The annual dose limit for occupationally exposed individuals is valid for what? Beta, x- and gamma radiations (pg. 139)
Patient dose increases as fluoroscopic what decreases? FOV (pg. 140)
What unit of measure is used to express ionizing radiation dose to biologic material? Rem (Sv) (pg. 140)
What is epilation? the skin response to radiation exposure that appears as hair loss. (pg. 140)
What is attenuation? the reduction in the intensity of an x-ray beam as it passes through a material. (pg. 140)
The largest amount of diagnostic x-ray absorption is most likely to occur in which of the following tissues? Bone (pg. 141)
Diagnostic x-radiation may be correctly described as what kind of energy and LET? low energy and low LET (pg. 142)
The photoelectric effect is an interaction between an x-ray photon and what? An inner-shell electron (pg. 146)
Filters used in radiographic x-ray tubes general are composed of what? Aluminum (pg. 146)
What type of cells are the most radiosensitive? Erythroblasts (pg. 149)
The term effective dose refers to what? Whole-Body Dose (pg. 150)
To within what percentage of the SID must the collimator light and actual irradiated area be accurate? 2% (pg. 154)
What is Roentgen? units that measure radiation output from a diagnostic x-ray tube. (pg. 156)
The target theory applies to what? DNA molecules (pg. 157)
Created by: arsturgill