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RADT 465 Protection
ARRT Registry Review
| Question | Answer |
|---|---|
| What is the velocity of electromagnetic radiations? | 3X10^8 m/s p.225 |
| What refers to the distance between two consecutive wave crests? | wavelength p.225 |
| What refers to the number of cycles per second and has a unit measurement of hertz? | Frequency p.225 |
| The electron's deflection from its original course caused by braking results in loss of energy | Bremsstrahlung p.227 |
| Brems comprise how much of the x-ray beam? | 70-90% p. 227 |
| Characteristic radiation comprises how much of the x-ray beam? | 10-30% p.227 |
| Ejects a K-shell electron thereby leaving a vacancy to be filled | Characteristic p.227 |
| What is the largest source of man-made ionizing radiation exposure to humans? | Medical radiation exposure p.229 |
| What contributes to image fog and pose a radiation hazard to personnel? | Compton Scatter p.229 |
| A relatively low-energy photon interacts with tissue and uses all its energy to eject an inner shell electron | Photoelectric effect p.228 |
| A fairly high-energy photon interacts with tissue and ejects an outer shell electron | Compton Scatter p.228 |
| Relationships in which the response is directly related to the dose received | linear (straight line) p.230 |
| Relationships in which the effects are not proportional to the dose | nonlinear p.230 |
| Refers to the dose below which no harmful effects are likely to occur | threshold p.230 |
| Effects that occur randomly and are "all or nothing" type effects | stochastic p.231 |
| Risks characterized by nonlinear dose responses and are associated with a threshold | deterministic p.232 |
| Radiation effects that affect the irradiated body itself | Somatic effects p.240 |
| An exceedingly high dose of radiation delivered to the whole body in a short period of time is required to produce ____ somatic effects | early p.240 |
| syndrome affecting bone marrow, causes nausea, vomiting, diarrhea, decreased blood count, infection, and hemorrhage | hematopoetic p.241 |
| Syndrome that caused severe damage to the stem cells lining the GI, death occurs in 2 weeks | Gastrointestinal p.241 |
| Syndrome that causes the circulatory system to collapse, increased pressure in the cranial vault,vasculitis, meningitis, ataxia, and shock. Death occurs in 3 day | Central nervous system p.241 |
| Ionizing radiation dose is ____ and _____ related to risk | directly and linearly p.249 |
| What is the most important way to reduce patient dose? | beam restriction p.252 |
| Equipment operating above 70 kV must have a minimum total filtration of ____ | 2.5 mm Al equivalent p.263 |
| The SSD must be at least ___ inches in stationary fluoroscopic equipment | 15 p.263 |
| The SSD must be at least ___ inches for mobile fluoroscopic equipment | 12 p.263 |
| What thickness of lead is required for lead aprons? | .25 mm p.271 |
| What is the dose limit to the fetus during the gestation period? | 5mSv p.274 |
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