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Electronic Dosimeter

Electronic Dosimeter. Canberra Mini-Radiac . ED Advantages. Advantages Alarms alert user Can be read by user at scene Can be set to alarm on dose or dose rate Can measure both dose and dose rate Gamma and x-ray doses (some available for beta and neutron)

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Electronic Dosimeter

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  1. Electronic Dosimeter Canberra Mini-Radiac

  2. ED Advantages • Advantages • Alarms alert user • Can be read by user at scene • Can be set to alarm on dose or dose rate • Can measure both dose and dose rate • Gamma and x-ray doses (some available for beta and neutron) • Able to measure a wide range of doses

  3. ED Disadvantages • Disadvantages • Not as accurate as TLDs • Most have to be programmed • More expensive than TLDs or DRDs • Require batteries • Some are not rugged (but some are)

  4. High Dose Rates For emergency life rescue operations, without a high rate survey meter, you can use an electronic dosimeter as a substitute if the dosimeter can read high rates (200 R/hr or higher) Do not hold your dosimeter up to sources because that can make your dose reading higher than what your body actually received

  5. Canberra Mini-Radiac Dosimeter • Max Rate: 500 R/hr • Max Dose: 999 R • Rugged & Water Resistant • Large Display & Large Buttons • Designed to be operated while wearing gloves and PPE • Two Levels each for Dose & Rate Alarms • Low: Caution, Near Radioactive Material • High: Danger, Snatch & Grab Rescue

  6. Units Dose Button Rate Button On/Off Button Canberra Mini-Radiac

  7. Mini-Radiac: AAA Batteries

  8. 4 Types of Mini-Radiac Alarms Low Dose Rate = 1 mR/hr Near something radioactive CAUTION High Dose Rate = 100 R/hr DANGER Turn Back Snatch & Grab Rescue GREEN RED

  9. 4 Types of Mini-Radiac Alarms (continued) Low Dose = 1 R Approaching EPA 5-Rem Limit for Emergency Activities High Dose = 20 R Approaching EPA 25-Rem Limit for Life-Saving GREEN RED

  10. Alarm Indicators Visible Dose Rate Alarm (Green) Low Dose Rate Alarm

  11. Visible Dose Rate Alarm (Red) High Dose Rate Alarm

  12. Visible Dose Alarm (Green) Low Dose Alarm

  13. Visible Dose Alarm (Red) High Dose Alarm DOSE

  14. Display (LCD) Vibrate Audio Signal Signals

  15. Display (LCD) Clearing Low Alarms Clear Low Alarm Doesn’t Stop: Display Stops: X Audio X Vibrate Press Clear/Test Button

  16. Display (LCD) Audio Signal Clearing High Alarms Clear High Alarm Doesn’t Stop: Display Audio Stops: X Vibrate Press Clear/Test Button

  17. Light Button Light Button

  18. Normal Background on Dosimeter • 5 – 30 µR/hr for Dose Rate • 5 – 30 µR of Dose for every hour since dosimeter was cleared • About 0.25 – 0.5 mR (250 – 500 µR) of Dose per day if dosimeter is left on

  19. Training Value Correlation

  20. Wearing Dosimeters • If available, every responder at radiological/nuclear incident should be issued a dosimeter • Wear dosimeter between the neck and waist

  21. TLD and Another Dosimeter Direct Reading Dosimeter TLD Dosimeter

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