RADT 456 RAD PROT. Word Scramble
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| Question | Answer |
| Wave-like fluctuations of electric and magnetic fields describes what kind of radiation? | Electromagnetic; Pg. 225 |
| What unit is frequency measured in? | hertz (Hz); Pg. 225 |
| What is the greatest portion of our background radiation exposure due to? | Naturally occurring sources; Pg. 226 |
| What percent of the x-ray beam is made up of Bremsstrahlung radiation? | 70-90%; Pg. 227 |
| T/F: The energy of the characteristic ray is equal to the difference in energy between the K and L shells. | True; Pg. 227 |
| T/F: The photoelectric effect is more likely to occur in absorbers having low atomic number and with high-energy photons. | False; high atomic number and low-energy photons; Pg. 228 |
| Compton scatter can contribute to image ___ and pose a radiation hazard to ___. | fog/personnel; Pg. 229 |
| What kind of curves are used to illustrate the relationship between exposure to ionizing radiation and possible resultant biologic responses? | Dose-responce curves; Pg. 230 |
| T/F: A nonthreshold curve has no safe dose. | True; Pg. 231 |
| What kind of risks are characterized by nonlinear dose responses and are associated with a threshold (safe) dose below which no effect is observed? | Deterministic risks; Pg. 232 |
| The Law of Bergonie and Tribondeau stated that which 3 kinds of tissues or cells are particularly radiosensitive? | Stem cells, Young immature tissues, and Highly mitotic cells; Pg. 233 |
| T/F: Diagnostic x-rays are considered high LET radiation. | False; low LET radiation; Pg. 234 |
| What kind of effect occurs when the ionizing particle interacts directly with the key molecule (DNA) or another critical enzyme or protein. | Direct effect; Pg. 234 |
| What kind of effect takes place when ionization takes place away from the DNA molecule, in cellular water? | Indirect effect; Pg. 234 |
| What does the 10-day rule state? | The first 10 days following onset of the menses is the safest time to schedule elective procedures of the abdomen/pelvis.; Pg. 238 |
| What kind of effects of radiation are those that affect the irradiated body itself? | Somatic effects; Pg. 240 |
| What is probably the single most important factor in keeping patient dose to a minimum? | Beam restriction; Pg. 250 |
| T/F: Inherent filtration tends to decrease as the x-ray tube ages. | False; increase; Pg. 253 |
| What are the three different kinds of gonadal shields? | Flat contact, shadow, and contour (shaped) contact; Pg. 255 |
| T/F: Repeat exposures contribute to a significant increase in unnecessary patient exposure. | True; Pg. 259 |
| When testing reproducibility, any variation in output intensity must not exceed ___%. | 5%; Pg. 262 |
| When testing linearity, any variation in output intensity must not exceed ___%. | 10%; Pg. 262 |
| What is the principal source of scattered radiation? | The patient; Pg. 269 |
| What are the cardinal principles of radiation protection? | Time, distance and shielding; Pg. 269 |
| The intensity of scattered radiation 1m from the patient is approximately ___% of the intensity of the primary beam. | 0.1%; Pg. 270 |
| Lead aprons and lead gloves must be at least ___mm Pb equivalent. | 0.25mm; Pg. 271 |
| What does it mean that lead aprons, lead gloves, and other apparel are secondary barriers? | They do not provide protection from the useful beam; Pg. 273 |
| The gestational dose limit to the fetus during the gestation period must not exceed 500 mrem. What is this amount in mSv? | 5 mSv; Pg. 274 |
| What is the internationally accepted unit of measure for exposure to x- or gamma radiations? | Roentgen; Pg. 281 |
| What is the number assigned to different types of ionizing radiations so that their effect(s) may be better determined? | Radiation weighting factor (Wr); Pg. 282 |
| What kind of monitoring device contains a thin layer of aluminum oxide (Al2O3)? | Optically stimuled luminescence (OSL); Pg. 283 |
| What kind of monitoring device uses various filters to determine the type and energy of ionizing radiation received? | Film Badge; Pg. 284 |
| What monitoring device contains crystalline chips of lithium fluoride (LiF)? | Thermoluminescent dosimeter (TLD); Pg. 285 |
| What kind of dosimeter is worn with high exposures or large quantities of radiation for short periods of time and allows an immediate reading to the user? | Pocket dosimeter; Pg. 285 |
| A pregnant radiographer's gestational exposure to the fetus must not exceed ___ rem. | 0.5 rem; Pg. 289 |
Created by:
Kaci Gehlhausen
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