electronic dosimeter canberra mini-radiac ed advantages advantages –alarms alert user –can be...
TRANSCRIPT
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Electronic Dosimeter
Canberra Mini-Radiac
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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
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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)
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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
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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
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Canberra Mini-Radiac
Rate Button
Dose Button
On/Off Button
Units
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Mini-Radiac: AAA Batteries
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Low Dose Rate = 1 mR/hr
Near something radioactive
CAUTION
High Dose Rate = 100 R/hr
DANGER Turn Back
Snatch & Grab Rescue
4 Types of Mini-Radiac Alarms
GREEN
RED
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Low Dose = 1 R
Approaching EPA 5-Rem
Limit for Emergency Activities
High Dose = 20 R
Approaching EPA 25-Rem
Limit for Life-Saving
4 Types of Mini-Radiac Alarms (continued)
GREEN
RED
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Low Dose Rate Alarm
Visible DoseRate Alarm(Green)
Alarm Indicators
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High Dose Rate Alarm
Visible DoseRate Alarm(Red)
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Low Dose Alarm
Visible Dose Alarm (Green)
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High Dose Alarm
DOSE
Visible Dose Alarm (Red)
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Signals
Display (LCD)
Vibrate
AudioSignal
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Clearing Low Alarms
Display(LCD)
ClearLow Alarm
Doesn’t Stop:
Display
Stops:
X Audio
X Vibrate
PressClear/TestButton
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Clearing High Alarms
Display(LCD)
PressClear/TestButton
AudioSignal
ClearHigh Alarm
Doesn’t Stop:
Display
Audio
Stops:
X Vibrate
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Light Button
Light Button
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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
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Training Value CorrelationReal World Values
Actions
Low Dose Alarm
1 R Serious radiological event
•Administrative controls•Rotate teams to stay under 5 R
High Dose Alarm
20 R Limit for life saving activities
•Leave immediately•Another team takes over•OR volunteer/aware risks/ w/permission
Low Dose Rate Alarm
1 mR/hr Three times background
•Proceed with caution•Continue to measure dose rate
High Dose Rate Alarm
100 R/hr Time to get out •Rapid Egress
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• If available, every responder at radiological/nuclear incident should be issued a dosimeter
• Wear dosimeter between the neck and waist
Wearing Dosimeters
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TLD and Another Dosimeter
Direct Reading Dosimeter
TLD Dosimeter