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RADT 465: RP

ARRT registry review Radiation Protection

QuestionAnswer
According to the NCRP, the monthly gestational dose-equivalent limit for embryo/fetus of a pregnant radiographer is? (PG 135) 5 mSv
A time of 1.5 minutes is required for a particular fluoroscopic examination, whose exposure rate is 275 mR/h. What is the approximate radiation exposure for the radiologic staff present in the fluoro room during the exam? (pg 135) 6.87mR
If the exposure rate to an individual standing 4.0m from a source of radiation is 10mR/h, what will be teh dose received after 20 minutes at a distance of 6m from the source? (pg 135) 1.48 mR
What type of cells have the greatest radiosensitivity in the adult human? (pg 136) lymphocytes
The interaction between ionizing radiation and the target molecule that is most likely to occur is the? (pg 136) indirect effect
What is the approx. entrance skin exposure for the average anteroposterior supine abdomen radiograph? (pg 136) 300 mrad
How will x-ray intensity be affected if the SID is doubled? (pg 136) its intensity decreases four times
What is established annual occupational dose-equivalent limit for the lens of the eye? (pg 136) 150 mSv
Occupational radiation monitoring is required when it is possible that the individual might receive more than? (pg 136) one tenth the annual dose limit
Irradiation of water molecules within the body and their resulting breakdown is termed? (pg 136) radiolysis
Which contributes more to occupation exposure? (pg 137) Compton scatter
The x-ray interaction with matter that is responsible for the majority of scattered radiation reaching the image receptor is? (pg 137) Compton scatter
With mA increased to maintain output intensity, how is the ESE affected as the SSD is increased? (pg 137) The ESE increases
Each time an x-ray beam scatters, its intensity at 1m from the scattering object is what fraction of its original intensity? (pg 137) 1/1,000
According to the NCRP, the annual occupational whole-body dose-equivalent limit is? (pg 137) 50 mSv
A thermoluminescent dosimetry system would use which of the following crystals? (pg 137) Lithium flouride
In radiation protection, the product of absorbed dose and the correct modifying factor is used to determine? (pg 138) rem (Sv)
Medical and dental radiation accounts for what percentage of the general public's exposure to human-made radiation? (pg 138) 90%
What is the minimum lead requirement for lead aprons, according to the NCRP? (pg 139) 0.05 mm Pb
An optically stimulated luminescence dosimeter contains which? (pg 139) Aluminum oxide
What is the term used to describe x-ray photon interaction with matter and the transference of part of the photon's energy to matter? (pg 139) Scattering
What is the approx. ESE for the average upright PA chest radiograph using 115 KVP and a grid? (pg 139) 20 mrad
To be in compliance with radiation safety standards, the fluoroscopy exposure switch much? (pg 139) be the "dead man" type
Primary radiation barriers must be at least how high? (pg 139) 7 ft
The annual dose limit for occupationally exposed individuals is valid for? (pg 139) beta, x-and gamma radiations
Patient dose increases as fluoroscopic? (pg 140) FOV decreases
What unit of measure is used to express ionizing radiation dose to biologic material? (pg 140) Rem (Sv)
The skin response to radiation exposure that appears as hair loss is known as? (pg 140) epilation
Biologic material is least sensitive to irradiation under which conditions? (pg 140) Anoxic
The reduction in the intensity of an x-ray beam as it passes through material is termed? (pg 140) attenuation
What type of dose-response relationship represents radiation-induced leukemia and genetic effects? (pg 141) linear, nonthreshold
A dose of 25 rad to the fetus during the seventh or eight week of pregnancy is likely to cause which? (pg 141) neurologic anomalies
Late effects of radiation, whose incidence is dose related and for which there is no threshold dose,are referred to as? (pg 141) stochastic
The largest amount of diagnostic x-ray absorption is most likely to occur in which tissues? (pg 141) bone
According to NCRP regulations, leakage radiation from the x-ray tube must not exceed? (pg 141) 100 mR/h
Which most effectively minimizes radiation exposure to the patient? (pg 141) high-speed intensifying screens
Created by: mnzeilinga