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rad bio ch 38
radiation bio ch 38 for quiz
| Question | Answer |
|---|---|
| Protective x-ray tube housing does what? | keeps leakage radiation to under 100mR/hr at 1 meter |
| Control panel radiation protection | audible of visual indication when tube is energized |
| Source to image distance indicator must be how accurate? | within +/- 2% of the SID |
| The collimator must be accurate within | +/- 2% of the SID |
| PBL must be how accurate? | within +/- 2% of the SID |
| Total filtration for tubes operating at 70+ kVP | 2.5 mm Al eq |
| Total filtration for tubes operating at 50-70 kVp | 1.5 mm Al eq |
| Total filtration for tubes operating below 50 kVp | .5 mm Al eq |
| Reproducibility | tube output should not vary by +/- 5% |
| Linearity | adjacent mA stations should not vary by 10% |
| SSD | source to skin distance (flouro) |
| What is the SSD for stationary fluoroscopes? | 15” |
| What is the SSD for mobile fluoroscopes? | 12” |
| How thick must the primary protective barrier on the flouro tube be? | 2mm Pb eq |
| What total filtration is needed in a flouro tube? | 2.5 mm Al eq |
| What lead equivalency should the bucky slot cover have? | .25mm Pb eq |
| What is the lead equivalency of the protective curtain or lead drapes? | .25mm Pb eq |
| Cumulative timer gives a signal after how much time has elapsed? | 5 minutes |
| What are the requirements for primary barrier shielding? | min. 7 ft. high, 1/16” lead thickness equivalency |
| What materials can be used as lead shielding on a primary protective barrier? | lead, masonry, brick concrete |
| Secondary protective barrier requirements | 1/32” Pb eq, |
| What materials can be used on a secondary protective barrier? | gypsumboard, glass, steel, wood |
| Controlled area | area occupied by radiography personnel and patients |
| What is the exposure for a controlled area? | less than 100 mrem/wk |
| Uncontrolled area | an area that can be occupied by anyone |
| What is the exposure for an uncontrolled area? | less than 2 mrem/wk |
| Workload | the greater the number of exams in a room, the more shielding required. |
| What is the workload exposure for a busy general purpose room? | 500mA/min/wk |
| What is the workload exposure for a private office? | 100mA/min/wk |
| Use factor | % of time te beam is on and directed toward a barrier |
| What are the 3 types of gas filled radiation detectors? | ionization chambers, proportional counters, Geiger-muller counter |
| At what exposure level do we see a decrease in the total number of RBCs? | 25 rad and above |
| How accurate is a TLD? | to +/- 5mrem |
| What is a TLD? | thermoluminescent dosimeter, uses lithium fluoride, Z number 8.2 |
| How accurate is a film bade? | accurate up to 10mrem |
| What is an OSL? | optically stimulated luminescence, use aluminum oxide |
| How accurate is the OSL? | to +/- 1mrem |
| What is the occupational exposure limit? | 5000mrem/yr or 5 rem |
| According to the NCRP, what is the use factor of the floor? | 1 |
| What are the timeframes for a TLD and OSL to be read? | monthly, quarterly, semiannual, annual, biannual |
| What is the minimum assumed kVp for a rad room? | 100+ kVp |
| Full occupancy adjacent areas | work areas ( ex. Offices, shops, living quarters, nurses stations) |
| Frequent occupancy adjacent areas | corridors, restrooms, patient rooms |
| Occasional occupancy adjacent areas | waiting rooms, stairways, outside areas |
Created by:
annaluz87
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