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RADT456
Radiation Protection
| Question | Answer |
|---|---|
| What are two sources of secondary radiation? | Leakage and scatter |
| What is the approximate entrance skin exposure for the average anteroposterior supine abdomen? | 300 mrad |
| What x-ray interaction is responsible for the majority of scattered radiation reaching the IR? | Compton scatter |
| The minimum lead requirement for lead aprons is what according to the NCRP? | 0.5 mm Pb |
| X-ray interaction with matter and the transference of part of the photon's energy to matter is called what? | Scattering |
| What type of radiation is responsible for the annual dose limit for occupationally exposed individuals? | Beta, x-, and gamma radiations |
| What type of photon is filtration most on? | Low-energy scattered photons |
| What is used to describe the quality of an x-ray beam? | HVL-half-value layer |
| Isotopes are atoms that have what? | Same atomic number but different mass |
| What is the purpose of the filter in a film badge? | Measure radiation quality |
| As LET increases, what happens with RBE? | Increase LET, increase RBE |
| Does the photoelectric effect involve interaction with an inner-shell electron or outer-shell electron? | Inner-shell |
| What occurs during the production of characteristic radiation at the tungsten target? | The incident electron ejects an inner-shell tungsten electron. |
| What effect is most responsible for patient dose? | Photoelectric effect |
| What is the single most scattering object in radiography and fluoroscopy? | The patient |
| What does effective dose refer to? | Whole-body dose |
| What is the primary function of filtration? | To reduce patient skin dose. |
| What does the target theory apply to? | DNA molecules |
| What is the pregnant radiographer's dose-equivalent limit for the first month? | 0.5 mSv |
| What unit is the radiation output from a diagnostic x-ray tube measured in? | Roentgen |
| Tabletop exposure rate should not exceed what limit during fluoroscopy? | 10 R/hr |
| What program ensures the proper functioning of x-ray equipment and protects both the employees and the patients? | Quality assurance |
| What amount of radiation exposure is required to cause temporary infertility to the reproductive organs? | 200 rad |
| What amount of radiation exposure is required to cause sterility to the reproductive organs? | 500 rad |
Created by:
cindymmc42812
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