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Radiological Equipment - Basic

Radiological Equipment - Basic. Objectives. For each radiation detection instrument: Identify capabilities, limitations, and primary uses Identify the components, controls, and indicators Perform basic operating procedures Understand operator maintenance. IsoTrak DoseGuard .

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Radiological Equipment - Basic

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  1. Radiological Equipment - Basic

  2. Objectives • For each radiation detection instrument: • Identify capabilities, limitations, and primary uses • Identify the components, controls, and indicators • Perform basic operating procedures • Understand operator maintenance

  3. IsoTrak DoseGuard Personal Alarm Dosimeter

  4. Personal Dosimeter • Capabilities • Records total gamma/x-ray dose and dose rate • User-adjustable features • Limitations • Not intended for survey • Does not detect alpha, beta, neutrons • No display light • Best use • Alert wearer of high dose or dose rate • Indoors hospital staff

  5. Equipment Safety Precautions • Fragile instrument; might survive 1 meter drop • Do not submerse; can withstand rain

  6. 8.8.8 mR - + Components, Controls, and Indicators Battery well Display Clip Button Speaker Chirp icon Battery icon Autoranging 3-digit Unit of measure

  7. Prepare for Operation • Before-operation checks • Look for obvious damage • Install battery: 1 AAA • Positive terminal inside • Power up • Hold button until long beep, then release • Automatic power up when installing battery • Check dose reading is 0.0 mR

  8. Basic Operating Procedure • Default is total dose • Check dose rate reading • Press button 1x • Display shows dose rate for 10 sec., returns to default

  9. Types of Alarms • High radiation • Dose alarm • Dose rate alarm • Equipment fault • Overflow alarms • Battery alarms

  10. Dose or Rate Alarms • Alarm sounds when exceeding alarm set point • Dose alarm: display flash + 1 beep/sec. • Dose rate alarm: display flash + 4 beeps/sec. • Both: display flash + 4 beeps/sec.

  11. Dose or Rate Alarms (cont.) • To silence audible alarm: press button 1x • To reset alarm • Dose rate alarm stops when exposure is reduced • Dose alarm stops when dose is reset to zero

  12. Overflow Alarms • Occurs when meter exposure exceeds factory-set measurement upper level • Dose overflow (1000 R): display “doo” + 2 beeps/sec. • Rate overflow (300 R/h): display “dro” + 8 beeps/sec. • Cannot be reset until removed from exposure

  13. Battery Alarms • Alarm during startup • Low battery: display shows battery symbol • Dead battery: failure to start • Alarm during operation • Low battery: battery symbol flashes, 1 long beep/hour • Dying battery: display “Lob” and 1 beep/sec. • Measurement functions stop

  14. Type of Alarm Dose/rate alarm Overflow alarm Low battery alarm Required Action Take immediate action to reduce exposure Silence and reset alarm Shut down instrument, remove from area Change battery Respond to Alarms

  15. Equipment Application • Need for dosimetry • Personal exposure record • Alert user of high dose or dose rate • Wear on chest pocket • Instrument inside pocket – prevent dropping • Remove metal objects from pocket – avoid unintentional shielding • Place in plastic bag (optional)

  16. After Operating • Power down procedure • Press button 2x • Display reads “OFF” • Hold button until long beep, release • Perform after-operation maintenance • Storage • Remove battery • Store in box with instructions

  17. Operator Care and Cleaning • Wipe exterior surfaces clean • Do not submerse; rain resistant but not water tight • If submersed—open battery well, shake out excess water, let it air dry • Avoid harsh solvents—may damage plastic case

  18. Change Battery During Operation • Replace battery if low battery alarm • Power Off; change battery; power On • Dose reading and settings not lost

  19. IsoTrak DoseGuard Summary • Understand capabilities, limitations, uses • Recognize components, controls, indicators • Perform basic operation • Understand operator maintenance

  20. Ultra Radiac Personal Radiation Monitor

  21. Radiation Monitor • Capabilities • Measures and records gamma/x-ray dose and rate • Multiple user features, data logger, PC download • Limitations • Does not detect alpha, beta, neutrons • Best uses • Personal dosimeter and rate meter • Used by decon team outdoors

  22. Equipment Safety Precautions • Do not submerse, but can withstand decon operations

  23. Controls and Indicators

  24. Digital Display Status indicators Units of measure Autoranging digital display

  25. Function Keys • Rate and Dose keys: Display dose rate or dose • Alarm key: Display “stay time” in minutes • Light key: Power On backlight • Clear/Test key: Perform operational test • On/Off key: Power On and Off Keys have other functions for advanced users

  26. Battery Life Indicator • Low battery: Flashing “BAT” in upper left corner • Less than 10 hours left • Press Clear/Test key to display minutes of battery left • Dying battery: Flashing “b” on blank display • Normal operation stopped

  27. Prepare for Operation • Before-operation checks • Look for obvious damage • Install batteries: 4 AAA • Observe polarity indicator • Starts “sleep” mode • Power up • Press On/Off key

  28. Prepare for Operation (cont.) • Perform operational test • Hold Clear/Test key until “888” appears • Test alarm: Press Rate, Dose, or Alarm keys • After self-test: Flashing “9” = pass or “0” = fail • Press Clear/Test key • Check the dose is 0.00

  29. Attach Carry Case

  30. Basic Operating Procedures • Check dose and dose rate • Turn on back light • Check stay time • Data logging • Alarms

  31. Check Dose and Dose Rate • Current dose rate • Normal default reading • Press Rate key from dose display • Total dose • Press Dose key • Returns to rate after 10 sec.

  32. Backlight • Press Light key • Blue light for 10 sec. • Why can’t I see the light?

  33. Check Stay Time • Stay time = number of minutes to safely remain at current dose rate and not sound dose alarm • Based on current dose rate and dose alarm setting • Press Alarm button • Normal background = “999” • If rate increases with low dose alarm set point, stay time decreases

  34. Data Logging • Log data point at: • Any dose alarm • End of normal shift • Records up to 300 events • Records date, time, dose, rate, etc. • Logging a data point • Power On, rate displayed • Hold Rate + Dose keys until number stops flashing • New number = log sequence

  35. Alarms

  36. Resetting Alarms • High rate alarms • Press Clear/Test key to still vibration alarm • Back away to stop audible and display alarms • Low rate alarms • Press Clear/Test key to still audible/vibration alarms • Back away until display alarm stops • Dose alarms • Press Clear/Test key to still audible/vibration alarms • Log the data point

  37. Type of Alarm High dose/rate alarm Low dose/rate alarm Low battery alarm Required Action Take immediate action to reduce exposure Silence and reset alarm Warn others of increased exposure Silence and reset alarm Change batteries Respond to Alarms

  38. Equipment Application • Decon line use • Personal exposure record • Alert user of high dose or dose rate • Use “source finder” mode as survey meter • Wear on belt • Instrument upside down, face out – flip up to read

  39. After Operating • Power down • Hold On/Off key until display shows “OFF” then “- - -” • Perform after-operation maintenance • Storage • Remove batteries • Store in carry case • Store IR reader with RSO

  40. Operator Care and Cleaning • Wipe exterior surfaces clean • Do not submerse—not water tight • Avoid harsh solvents—may damage plastic case

  41. Change Batteries • Replace batteries if low battery alarm • Power Off; change batteries; power On • Ensure correct orientation • Dose reading and settings not lost • Sleep mode starts automatically • Power On then Off to prevent battery drain

  42. Ultra Radiac Summary • Understand capabilities, limitations, uses • Recognize components, controls, indicators • Perform basic operation • Understand operator maintenance

  43. Radiation Survey Meter Responder kit and equipment

  44. Survey Meter Kit • Capabilities • Measures alpha, beta, gamma, x-ray dose rate • Complete kit in hard case • Limitations • Requires separate probes • No dosimeter function • Best uses • Area survey • Check radiation from contaminated person/object

  45. Equipment Safety Precautions • Imbedded radioactive check source—keep covered • 1 μCi Cs-137 on side of case • Delicate pancake probe face, internal components; do not drop or puncture • High internal voltage; power Off before changing probes or opening case

  46. Major Components Batteries Hard carry case Meter Cable Pancake probe Gamma probe

  47. Additional Components • Additional survey meter • Cable • Extension handle pancake probe

  48. ON F AUD OFF OFF S RATEMETER DET DET 1 2 SCALAR LIGHT CAL RESET Controls and Indicators F/S toggle (response time) Display Audio toggle (chirp) Probe connector Detector toggle (parameters) Power/mode switch Calibration switch well Light button Reset button Battery well

  49. Digital Display Autoranging decimal and units 4-digit number Units of measure Status messages Low battery icon 6-digit number (1st & 2nd digits)

  50. Prepare for Operation • Before-operation checks • Install batteries – 2 D cells • Observe polarity indicator • Attach probe • Depends on intended use

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