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rad bio ch 38

radiation bio ch 38 for quiz

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