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Radt 456 Rad Protect
ARRT registry review covering radiation protection
| Question | Answer |
|---|---|
| Define wavelength | Distance between two consecutive wave crests |
| What action is responsible for the release of an x-ray photon in Bremsstrahlung radiation? | The slowing down or "braking" of the electron |
| How much of an x-ray beam is composed of Brems radiation? | 70%-90% |
| What is the term for when an outer shell electron moves into an inner shell? | Characteristic radiation |
| What is the result when a high energy xray interacts with tissue and eject an outer shell electron? | Compton Scatter |
| What type of interaction is responsible for patient dose? | Photoelectric |
| In traditional units, how much dose is received from an average chest x-ray? | 10mrem |
| What type of effect are usually a result of high dosage in a short period? | Early |
| Is embryologic effect early or late? | Late |
| According to the Law of Bergonie and Tribondeau, what three types of tissues are most radiosensitive? | Stem, Young, Highly Mitotic |
| What theory explains why radiation can cause death in some cells? | Target theory |
| What is the most radiosensitive cell? | Lymphocyte |
| During which trimester is the fetus most susceptible to radiation? | First |
| What term is defined as the average annual gonadal dose to population of childbearing age? | Genetically significant dose |
| What is the genetically significant dose estimated to be? | 20mrem |
| What type of effects can be caused by a very large single exposure of radiation to the body? | Early somatic |
| Name three types of beam restrictors | Aperture diaphragm, cone/cylinder, collimator |
| What filtration thickness is required when equipment is operated above 70 kV? | 2.5mm Al equivalent |
| What are the two types of AEC's? | Ionization Chambers and Phototimers |
| What unit is used to measure ionization in the air? | Roentgen |
| What unit describes absorbed dose? | rad |
| Where is the ionization chamber type of AEC located? | Between the patient and the IR |
| Where is the phototimer type of AEC located? | Beneath the IR |
| For dose reduction, what positioning consideration should be made for skull imaging? | Perform the exam PA |
Created by:
jaminton
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