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RADT 456 Rad Protec

ARRT Registry Review

What is used to account for the differences in tissue sensitivity to ionzing radiation when determining effective dose E? Tissue weighting factors (Wt)
According to the NCRP, the monthly gestational dose equivalent limit for embryo/fetus of a pregnant radiographer is what? 5 mSv
True or False: Regarding mobile radiography, exposure switches must be the two stage type False
What cell types have the greatest radiosensitivity in the adult human? Lymphocytes
The interaction between ionizing radiation and the target molecule that is most likely to occue is called what? The indirect effect
What is the approximate entrance skin exposure for the average AP supine abdomen radiograph? 300 mrad
What is the established annual occupational dose equivalent limit for the lens of the eye? 150 mSv
Irradiation of water molecules within the body and their resulting breakdown is termed what? Radiolysis
Which of the following contributes most to occupational exposure? Compton scatter
What is used to account for the differences in tissue characteristics when determining effective dose to biologic material? Tissue weighting factors (Wt)
The x-ray interaction with matter that is responsible for the majority of scattered radiation reaching the IR Compton scatter
With mA increased to maintain output intensity, how is the ESE affected as the source to skin distance is increased? The ESE increases
True or False: Late radiation induced somatic effects include thyroid cancers, cataractogenesis and genetic mutations True
Each time an x-ray beam scatters, its intensity at 1m from the scattering object is what fraction of its original intensity? 1/1,000
Annual occupational whole body dose equivalent limit 50 mSv
A thermoluminescent dosimetry system would use which of the following crystals? lithium fluoride
What are sources of secondary radiation? Leakage and scattered radiation
True or False: Focal spot size has an effect on patient dose False
The photoelectric effect is mroe likely to occur when? Absorbers having a high Z number and positive contrast media
The annual dose limit for medical imaging personnel includes radiation from what? occupational exposure only
Medical and dental radiation accounts for what percentage of the general public's exposure to human made radiation? 90%
What is the minimum lead requirement for lead aprons? 0.50mm Pb
What is the approximate ESE for the average upright PA chest radiograph using 115 kVp and a grid? 20 mrad
Primary radiation barriers must be at least how high? 7 feet
What unit of measure is used to express ionizing radiation dose to biologic material? Rem(Sv)
Created by: eapurdue