Rae GammaRAE II User Training
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Rae GammaRAE II User Training

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Using the
GammaRAE II
Personal Radiation
Detector

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Summary of Contents for Rae GammaRAE II

  • Page 1 Using the GammaRAE II Personal Radiation Detector...
  • Page 2 Training Agenda • GammaRAE II Features • Normal Usage – Turning Unit On – Operating Mode – User Screens • Advanced Features – Programming Mode...
  • Page 3 GammaRAE II Features • Detector: CsI (TI)/Photodiode • Sensitivity: More than 1 cps per µR/hr (>100 – cps per µSv/hr) • Dose Equivalent: 1–4000 µR/h (0.01–40 µSv/h) • Rate (DER) range • for 137Cs • Accuracy of DER: ± 30% •...
  • Page 4 GammaRAE II Features • LCD display flips for 2-way viewing • Continuous digital display of dosage rate in µR/h or µSv/h (user programmable) • Programmable audible, visible and/or vibration alarms • Highly visible LED lights on both sides of LCD graphic display •...
  • Page 5 GammaRAE II Reliability • Passes Drop Test from 59” (1.5m) • Non-slip rubber housing with grippable ridges securely fits into hand or glove • 0 -100% humidity, water resistant, IP-65 rated case • Temperature range of -4 F to 122...

  • Page 6: Physical Description

    Physical Description MODE Battery button for Compartment selecting mode and function Buzzer alarm SET button for setting or selecting parameters...
  • Page 7 Physical Description LCD flips 2 ways with SET button LED alarm to easily show operation parameters and radiation measurements Battery compartment cover screw...
  • Page 8 Training Agenda • GammaRAE II Features • Normal Usage – Replacing Battery – Turning Unit On – Operating Mode – User Screens • Advanced Features – Programming Mode...

  • Page 9: Replacing Battery

    Replacing Battery • Using either a flat- head screwdriver or a coin, turn screw counterclockwise to loosen • Tilt cover off to access AA batteries. – Initial use may require thin, flat object to assist in removal • Screw is captured in battery cover –...
  • Page 10 Replacing Battery • Insert new batteries according to directions on back of GammaRAE II • Replace cover and turn screw clockwise to tighten • Unit will beep and LEDs will flash once indicating full battery charge • If alarm beeps continuously, or makes a “zapping”...
  • Page 11 Training Agenda • GammaRAE II Features • Normal Usage – Replacing Battery – Turning Unit On – Operating Mode – User Screens • Advanced Features – Programming Mode...
  • Page 12 • Alarm sounds (if buzzer is set to ON) • LCD displays unit information – LEDs and vibrator self-test at this time • Instrument performs self-check – Time and battery status are displayed • GammaRAE II performs a 36-second background “calibration”...

  • Page 13: Start-Up Warnings

    Start-Up Warnings Important! If your GammaRAE II displays “Gamma sensor not found” or “No sensor installed!” contact your distributor or RAE Systems service at 408-752-0723. Do not attempt to use or repair the unit. There are no user-serviceable parts in the GammaRAE II.
  • Page 14 Start-Up Once calibration is complete and the unit is in Normal Operating Mode (NORM), you will see a screen like this. Note: NORM does not mean “Naturally Occurring Radioactive Material”; It indicates that the unit is in Normal Operating Mode.

  • Page 15: Turning Unit Off

    Turning Unit Off • Press and hold the MODE button for 5 seconds • The detector counts down 5 seconds on the screen, flashes the orange LEDs, and beeps, and then shuts off • Do not release the MODE button until the unit has counted down to zero, flashed the red LEDs, and sounded a long beep.
  • Page 16 Training Agenda • GammaRAE II Features • Normal Usage – Replacing battery – Turning Unit on – Operating Mode – User Screens • Advanced Features – Programming Mode...
  • Page 17 GammaRAE II Operations • The GammaRAE II has two modes of operation: Normal Operating Mode (NORM) and Programming Mode (PROG). • In normal operating mode, the GammaRAE II detects Gamma radiation and accumulates radiation dosage data. • In Programming Mode, operating...
  • Page 18 Training Agenda • GammaRAE II Features • Normal Usage – Replacing battery – Turning Unit on – Operating Mode – User Screens • Advanced Features – Programming Mode...

  • Page 19: User Screens

    User Screens • NORM - Normal Operation Mode • CAL – Background Calibration • PEAK – Maximum radiation level detected since last cleared • MIN – Minimum radiation level detected since last cleared • DOSE – Accumulated radiation dosage since last cleared •...
  • Page 20 Normal Operating Mode (NORM) • Displays a measurement of the ambient radiation. • Can operate in “search mode” (expressed in counts per second, cps) or “detection mode” (µR/h or µSv/h, depending on how the detector is set up in Programming Mode) •...
  • Page 21 Background “Calibration” (CAL) • Background “Calibration” – Low dosage background radiation can come from things like asphalt, higher elevations, fertilizers, and even recent hospital procedures • Press the SET button to have the detector re-” “calibrate” to the background radiation •...
  • Page 22 Maximum Reading (PEAK) • The maximum radiation level detected since last cleared • Press the SET button to clear the PEAK value • The PEAK value is also cleared when the detector is turned off • Press the MODE button to step to the next function...
  • Page 23 Minimum Reading (MIN) • The minimum radiation level detected since last cleared • Press the SET button to clear the MIN value • The MIN value is also cleared when the detector is turned off • Press the MODE button to step to the next function...
  • Page 24 Accumulated Dose (DOSE) • The accumulated radiation dosage since last cleared • Press the SET button to clear the DOSE value • Press the MODE button to step to the next function...
  • Page 25 Dose Rate versus Dose • The speedometer tells us how many miles per hour we are traveling • A dose rate meter (detector) tells us how many mSv or mrem are received per hour • The odometer shows how many miles the car has traveled •...
  • Page 26 Why measure Dose? • It makes a difference whether the high dose is received all at one time or over a long period of time. • “For example, a dose of 5,000 mSv is usually lethal if it is received in a short period and if the patient is left without special medical care.
  • Page 27 ICRP Standards: Important Dose Limits Exposed Workers Average: 20 mSv or 2000 mrem per year Maximum: 50 mSv or 5000 mrem per year During pregnancy: 2 mSv or 200 mrem per year The public Average: 1 mSv or 100 mrem per year Single event: 5 mSv or 500mrem...
  • Page 28 Typical Radiation Doses Exposed workers Average 1 to 3 mSv per year/100 to 300 mrem Variation range 0 to 20 mSv/0 to 2000 mrem Chest x-ray examination About 0.1 mSv per examination/10 mrem Variation range 0.05 to 5 mSv/5 mrem to 500 mrem Major x-ray examination Up to 20 mSv per examination/up to 2,000 mrem...
  • Page 29 Detector Status (STAT) • Detector status • On: Run time from when the detector was turned on (shown in hours and minutes, 0000:00) • BattV: Battery voltage • Temp: Internal temperature (can be displayed in °C or °F – set in Programming Mode) •...
  • Page 30 Self Test (TEST) Self test: This consists of tests to make sure all alert functions are working properly. 1. Press the SET button to accept and to initiate testing. 2. The buzzer is tested. Press the SET button to start the next test.
  • Page 31 SET button to start the next test. 5. The backlight is tested. Press the SET button to start the next test. 6. The alarm buzzer is tested. Press the SET button to finish the TEST functions. This returns GammaRAE II to Normal Operating Mode.
  • Page 32 Training Agenda • GammaRAE II Features • Normal Usage – Replacing battery – Turning Unit on – Operating Mode – User Screens • Advanced Features – Programming Mode...
  • Page 33 Programming Mode (PROG) Programming Mode is used to change alarm settings and detector settings • Hold the MODE and SET buttons for 3 seconds to enter into Programming Mode • Press the MODE button to step through the menu • Press the SET button to select...
  • Page 34 Programming Mode (PROG) • Alarm Set allows you to reset the alarm setpoints (CF) • Datalog Set • Monitor Set allows you to reconfigure the parameters of the GammaRAE II...

  • Page 35: Alarm Set

    Alarm Set • Select Alarm Set to set the low detection limit for the alarm • The Gamma CF is used to set σbk Low Alarm = CF* – σbk = (standard deviation of background) – this is the same as the ‘n’ in the GammaRAE pager •...
  • Page 36 Alarm Set • The alarm is not a fixed value, but a % above background • Smaller “CF" increases the alarm sensitivity – Small “CF” is like no squelch and large “CF” is like full squelch • Alarm threshold value (alarm point): Alarm = B + CF x D –...
  • Page 37 Alarm Set • Example: At a background reading of 15 μR/h Alarm Probability of Alarm % Above Threshold False Alarm Background Value 17 μR/h 16.6% 20 μR/h 2.6% 22 μR/h 0.2% 24 μR/h 0.01% 26 μR/h <0.01% 29 μR/h <0.01% 31 μR/h 105% <0.01%...
  • Page 38 Alarm Set • To exit Alarm Set, step through the options using the MODE button until you see “Quit” • Press the SET button to exit Alarm Set • Then step through the Main Menu until you see “Quit” • Press SET to exit Program mode and return to Normal Operating Mode...

  • Page 39: Monitor Set

    Monitor Set • Select Monitor Set to change any of the following parameters: – Back Lite • Default setting: Manual – Buzz & Lite • Default setting: Both On – Vibrate • Default setting: On – Temp Unit • Default setting: Celsius –...
  • Page 40 Monitor Set • Back Lite – Set the behavior of the display backlight • Automatic – A photosensor turns on the light in dim lighting • Manual – Turn on by pressing MODE • Off • Buzz & Lite – Set the behavior of the audible and visible alarms •...
  • Page 41 Temp Unit • Set the unit of measure • Choices are Fahrenheit and Celsius • Press MODE to select Fahrenheit or Celsius • Then press SET to save your choice and exit...

  • Page 42: Gamma Unit

    Gamma Unit • Set the unit of measure (of radiation). • Choices are µR/h (US) or µSv/h (SI Unit) – 100 μR/h = 1 μSv/h • Press MODE to select unit • Press SET to save your choice and exit...

  • Page 43: Change Date

    Change Date • Set the date (mm/dd/yyyy). • Press MODE to step through month, date, and year, and press SET to increment through the digits (holding the SET button speeds through the numbers) • Press MODE to select “Save” and press SET to save your date changes and exit •...

  • Page 44: Change Time

    Change Time • Set the time (hh:mm:ss) • Press MODE to step through hours, minutes, and seconds, and press SET to increment through the digits (holding the SET button continuously speeds through the numbers). • Press MODE to select “Save” and press SET to save your time changes and exit •...
  • Page 45 Questions? RAE Systems 3775 North First Street San Jose, CA 5134 Voice: 408-952-8200 Fax: 408-952-8480 www.raesystems.com elang@raesystems.com...

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