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RADT 456 Rad Protec
ARRT Registry Review
Question | Answer |
---|---|
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) |