Radiation Monitoring Devices & Detectors

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Radiation Monitoring Devices & Detectors
2014-03-18 21:36:24
radiation therapy
Registry Review
Radiation monitoring devices
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  1. Measures absorbed dose; When it is exposed to ionizing radiation excited electrons are trapped by the LiFl crystals; To read the device it must be heated to prompt the electrons to fall to their original state, emitting light that is proportional to the original exposure (can be processed on site); Doesn't estimate energy of exposure:
    Thermoluminescent Dosimeter (TLD)
  2. A small piece of film btw metal filters with the density on the processed film being proportional to the original exposure; Can detect approx energy of exposure; Inexpensive & easy to process; Generally mailed off to be processed; Provides permanent record of exposure; ±20% accuracy:
    Film Badge
  3. A small low energy ionization chamber; Reading is immediate; No permanent record; Not routinely used in radiation therapy settings; ±2% accuracy:
    Pocket Dosimeter
  4. Small electronic probe placed on or inside the body to measure the actual amount of radiation being delivered to a predetermined point:
  5. Useful for locating a lost source or small amount of radioactive contamination; Limited to about 100 mrem/hr, will "swamp" at high levels; Detects photons & particles:
    Geiger-Mueller Counter
  6. Gas filled detector that can be used to detect or measure ionizing radiation; As ionization occurs, an electrical current is read to provide the amount of radiation; Also used in the linear accelerator:
    Ionization Chamber
  7. Portable ionization chamber; Measures dose rate in mR/hour; Useful in determining the exposure rate outside a radioactive implant patient's room:
    Cutie Pie Detector
  8. Ionization chamber filled with BF3 gas (boron trifluoride) and is surrounded by a cadmium-loaded polyethylene sphere to slow neutrons so they can be detected efficiently:
    Neutron Detector
  9. Neutron Detector
  10. Geiger-Mueller Counter
  11. Ion Chamber
  12. Pocket Dosimeter
  13. Cutie Pie
  14. Measurement of absorbed dose to water, based on a process of oxidation of ferrous ions to ferric ions in acidic aqueous solution by ionizing radiation:
    Fricke Dosimeter
  15. Wide range, more sensitive & accurate than TLD; Can be reanalyzed for confirmation of dose; Expensive, New technology not well understood:
    Optimal Stimulated Luminescence Aluminum Oxide (OSL)
  16. Neutrons are best stopped by materials high in: