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Final
RDTC 236
| Question | Answer |
|---|---|
| Xrays are only produced when button pressed (T/F)? | True - Dead man's switch |
| Leakage MAX of Protective Housing? | 1 mGy/hr (100 mR/hr) @ 1 meter |
| Acceptable SID Variance? | 2% |
| Collimation & PBL accurate within __% of __? | 2% of SID |
| Minimum Filtration Half Value Layer? | HVL 2.5 mm Al Equiv @ 80 kVp |
| Acceptable Reproducibility Variance? | 5% mR/mAs |
| Acceptable Linearity Variance? | 10% mR/mAs |
| Handswitch placed permanently BEHIND protective barrier (T/F)? | True |
| Mobile system exposure switch on __ cord? | 2 meter (6.5') |
| Minimum Source-to-Skin Distance for Stationary Fluoro? | 38 cm (15") |
| Minimum Source-to-Skin Distance for mobile C-arm? | 30 cm (12") |
| Primary Protective Barrier | |
| Legal Filtration Standard? | Minimum HVL 2.5mm AL Eq @ 80 kV |
| Minimum shielding for Bucky Slot Cover? Is it Automatically activated? | .25 Pb (Lead Equiv), Auto |
| Minimum shielding for Protective Curtain btwn Patient & Rad? | .25 Pb |
| Entrance Skin Exposure in fluoro is measured at __ or __? | Table top or 30 cm from IR |
| MAX Entrance Skin Exposure WITHOUT high level boost? | 10 R/min |
| MAX Entrance Skin Exposure IN high level boost? | 20 R/min |
| Primary Barrier is for surfaces Primary Beam is routinely directed at (T/F)? | True |
| Primary Barrier is for surfaces that intersect Scatter, Secondary, & Leakage radiation (T/F)? | False - Secondary |
| Barrier protection uses what size Lead-Backed drywall? | 1/16" (1.6 mm) or 1/32" (.8 mm) |
| Scatter 1 meter from patient is __% of INTENSITY of radiation entering patient? | 1/1000 (.1%) |
| Calculating Barrier Thickness - W=? | Workload in mA min/wk |
| Calculating Barrier Thickness - U=? | Use Factor |
| Calculating Barrier Thickness - T=? | Occupancy (time of) |
| How do you find the mA minutes for the workload (WUT)? | mAs ÷ 60 |
| WUT is calculated & __ are used to find required lead thickness? | Tables from NCRP Report #49 |
| Secondary Barriers are only required to be __ high? | 7' |
| Barrier Thickness Limits for Controlled Areas? | 100 mrem/ wk |
| Barrier Thickness Limits for Uncontrolled (public) Areas? | 2 mrem/wk |
| __ radiation detectors measure the release of electrons in gas and are used as Survey & Calibration instruments? | Ionization Chamber |
| __ radiation detectors are used to locate smallest potential spills or Radionuclides? | Geiger-Muller Detector |
| Any ionization releases multiple electrons due to Cascade Effect caused by Higher Voltage in chamber, used in __ rad detectors? | Geiger-Muller |
| __ radiation detectors used in labs to detect Alpha & Beta radiation? | Proportional Counter |
| __ radiation detectors used in Gamma Cameras & some CT scanners? | Scintillation Detectors |
| For Scintillation Detectors, the electron pulse output of the PMT is proportional to __? | Energy absorbed by Scintillation Crystal |
| Scintillation Crystals emit __ when struck by __? | Light (from) Radiation |
| PMT has Photocathode that emits __ when struck by __? | PMT- Electrons (from) Light |
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RadTechTKD
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