1. Introduction



If you don't read anything else in this manual, read Chapter 2, Basic Functions, and Chapter 3, Controls and Indicators. These cover the basics of using the UltraRadiac(TM) Personal Radiation Monitor.


Note: Operational procedures are the responsibility of the UltraRadiac's users. Instructions provided in this manual are "how to's", not procedural recommendations.


Your UltraRadiac can measure and display both the instantaneous radiation dose rate (Rate), the amount of radiation being measured at this moment, and the total accumulated radiation dose received (Dose) since the dose memory was last cleared.

The Alarms



The UltraRadiac’s presettable alarms for both instantaneous Rate and cumulative Dose can alert you to hazardous conditions. When an enabled alarm’s threshold is exceeded, a visual indicator will begin flashing and, optionally, an LED will blink and/or an audible alarm will sound. Some units also include a vibrator alarm.



The Radiation Units



Depending on the model, your UltraRadiac is factory-set to display the Rate and the Dose in one of these units of radiation measurement:

  • R (roentgen) – a measure of radiation exposure.

  • Gy (gray) – a measure of absorbed dose.

  • Sv(sievert) – a measure of absorbed dose equivalent.

Most illustrations in this manual show the radiation units asμR (microroentgens, one millionth of a roentgen). The units are defined in Specifications.



Equipment Check



If your organization’s procedures require periodic equipment checks, refer to Chapter 4, Operational Verification Tests.



Setting Up the Unit



The UltraRadiac has five modes: Rate, Dose, Source Finder, Sleep and Data Logging. Chapter 5, Setting Up the Unit, describes them and tells you how to set and enable the Rate alarms and the Dose alarms.



Maintenance Procedures



Chapter 6, Maintenance Procedures, lists the UltraRadiac's preventive maintenance checks and describes how to install or replace the batteries.



2. Basic Functions



The first time you take your UltraRadiac(TM) out of its shipping carton, you'll have to install its batteries. See The Batteries for instructions.

POWERING THE UNIT



  • To turn the unit on, press ON/OFF until 000 is displayed.

  • Release ON/OFF

  • The instantaneous rate will be displayed, with the word RATE at the top left of the screen.

  • If a b or a blinking BAT indicator appears in the display or if the display is blank, refer to The Battery Life Indicators.

  • To turn the unit off, press ON/OFF until --- is displayed.

TURNING OFF AN ALARM



The UltraRadiac has two alarms, Low Level and High Level for each of two modes, Rate and Dose.

If any alarm sounds, the next four sections tell you how you turn it off.



Clearing the Low Rate Alarm


  • Press the CLR/TEST key to turn off the vibrator and the audio alert.

  • The visual alerts will continue until the rate falls below the Low Rate Alarm threshold.


    • Clearing the High Rate Alarm


    • Press the CLR/TEST key to turn off the vibrator.

    • The visual alerts will continue until the rate falls below the High Rate Alarm threshold.


      • Clearing the Low Dose Alarm


      • Press the CLR/TEST key to turn off the vibrator and the audio alert.

      • The visual alerts will continue until the rate falls below the Low Dose Alarm threshold.


      • To turn off the visual alerts, you'll have to clear the dose memory. See Clearing the Accumulated Dose.


      Clearing the High Dose Alarm


      • Press the CLR/TEST key to turn off the vibrator.

      • The visual alerts will continue until the rate falls below the High Dose Alarm threshold.

      • To turn off the visual alerts, you'll have to clear the dose memory. See Clearing the Accumulated Dose.

CHECKING YOUR STAY TIME



  • Press ALARM to see the number of minutes you can safely stay in the area at the current Dose Rate.


If the Dose Rate goes up, your remaining Stay Time will go down.


You should check your Stay Time frequently when you are in the presence of radiation.

CHECKING THE ACCUMULATED DOSE



  • Press DOSE to see the accumulated dose (the word DOSE is at at the top right of the screen).

  • To return to the Rate Mode, press the RATE key.

CLEARING THE ACCUMULATED DOSE



  • Press and hold DOSE + CLR/TEST.

  • The display will flash for a few seconds, then clear the accumulated dose.

  • To return to the Rate Mode, press the RATE key.

READING THE ALARM THRESHOLDS



  • Press ALARM + RATE or ALARM + DOSE.

  • You'll see an H, for High Level Alarm, displayed.

  • To read the Low Level Alarm setting, press the RATE (DOSE) key again; the display will show an L.

  • Press the CLR/TEST key; the flashing display will show the selected (H or L) alarm threshold setting.

  • If the Vibrator Alarm has been activated, the display will alternate between the threshold value and a vertically scrolling horizontal bar (---).

  • The unit will automatically return to the main display about 10 seconds after the last keypress.

CHANGING THE ALARM INDICATORS



  • Press the ALARM + RATE keys or the ALARM + DOSE keys.

  • You'll see an H, for High Level Alarm, displayed.

  • To change the Low Level indicators, press the RATE (DOSE) key again; the display will show an L.

  • Press the CLR/TEST key to access the selected (H or L) indicators.

  • Repeatedly press the ALARM key until you see the desired combination of indicators, AUDio, VISual, vibrator, or no indicators.

  • The unit will automatically return to the main display about 10 seconds after the last keypress.

USING THE BACKLIGHT



In dim light, you can enable the unit's backlight to read the display.


  • Press the LIGHT key.

  • The display's backlight will turn on.

  • To conserve battery power, the backlight will automatically turn off in about five seconds.


3. Controls and Indicators




This is a brief overview of the UltraRadiac's(TM) controls and indicators and its protective case. Each of the controls and indicators is covered in detail in the remaining sections of the manual.


Figure 1 The UltraRadiac Front Panel



THE FUNCTION KEYS



The primary function of each of the function keys is briefly described below. The programming functions of these keys are covered in Chapter5, "Setting Up the Unit".


On/Off:

Press and hold to turn the unit on or off.


Rate:

Press to change to the Rate Mode.


Dose:

Press to change to the Dose Mode.


Alarm:

Press to see the Stay Time, the number of minutes you can safely stay in the area at the current Dose Rate.



If the Dose Rate goes up, your remaining Stay Time will go down.


You should check your Stay Time frequently when you are in the presence of radiation.



Light:

In the dark, press to illuminate the display for about five seconds. Note that the backlight may not be visible in daylight or normal room lighting.


Clr/Test:

In the Rate Mode, press and hold to enable the Display Test Sequence.

THE BATTERY LIFE INDICATORS



The UltraRadiac has two battery life indicators. See The Batteries for instructions on changing the batteries.


  • If a blinking b is displayed, the unit has stopped functioning. Replace the batteries before the unit's next use.

  • If a blinking BAT is seen in the top-left corner of the display, the unit's batteries have 10 hours or less of useful life. Replace the batteries as soon as possible.

  • If the display is blank, the batteries are dead. Replace the batteries before the unit's next use.


Remaining Battery Life


In the Rate Mode with the BAT indicator blinking, press the CLR/TEST key. A three-digit number indicating the approximate remaining battery life, in minutes, will be displayed.

ATTACHING THE BELT CLIP



To attach the supplied belt clip, screw the clip's two captive retaining screws into the threaded inserts at the top of the unit's rear panel.

THE CARRYING CASE



If the belt clip is installed, remove it from the back of the UltraRadiac by unscrewing its two captive retaining screws and lifting the clip off the unit.


Now put the UltraRadiac into the carrying case with the display toward the bottom (closed) end of the case. To close the case, refer to Figure 2 and...

  • Fold the top flap down over the front of the case.

  • Pull the narrow strap across the top flap.

  • Secure the narrow strap to both the top flap and the side of the case.

  • Thread your belt through the slots in the belt loop.

Figure 2 Using the Carrying Case








4. Operational Verification Tests




These Operational Verification Tests should be performed periodically, as required by your departmental procedures.


Installing the Batteries



The first time you take your UltraRadiac(TM) out of its shipping carton, you'll have to install its batteries. See The Batteries for instructions.

TURNING THE UNIT ON



Press and hold the ON/OFF key until the display appears, then release the key.


  • The unit will display the numbers 0, 1, 2, 3, 4, in sequence.

  • The Rate Mode display should appear, with the word RATE shown at the top left of the screen

  • If a b or a blinking BAT indicator appears in the display or if the display is blank, refer to The Battery Life Indicators.


Figure 3 The Rate Display














  • AUD and VIS indicate that the Audio and Visual alarms are both enabled.

  • The unit will start counting and displaying the instantaneous Rate. Naturally occuring background radiation will cause the unit to display a low reading.[1]

  • To switch to the Dose Mode, press the DOSE key.

  • Press the RATE key to return to the Rate Mode.

  • The rate units indicator (μR/hr) will blink slowly to show that the Rate Mode is active.




    • 1. Naturally occuring background radiation typically measures less than 20μR/h, 0.20μGy/h or 0.20μSv/h.


    Note: Because the UltraRadiac automatically adjusts its display to accomodate the amount of data, the units (R, for instance) may be displayed with a prefix. For instance, at natural background levels, you'll see É R, microroentgens.


    At higher exposure rates, the display will change tomR(milliroentgens). With large exposure rates, it will show just R. It's important to understand these units because each one is 1000 times greater than the previous one.



TURNING THE UNIT OFF



To turn the unit off:


  • Press and hold the ON/OFF key.

  • OFF will be displayed.

  • Then you'll see ---

  • Release the ON/OFF key; the unit will turn its power off.

All data collected up to this time will be stored in memory.

INSTRUMENT TEST



While in the Rate Mode, press and hold the CLR/TEST key until you see the test display in Figure 4, then release the key[2].


Figure 4 The Test Display

















Display Test Sequence


  • A set of numbers in the following order will appear. Check that all of the numbers are exactly as shown below.

00.0 mR
1 1 1 mR
2.22 mR
33.3 mR
444 mR
5.55 R
66.6 R
777 R
888 R
999 R
00.0 mR
9(blinking)


  • The blinking 9 indicates that the unit passed all tests. A blinking 0 indicates a failure; contact your local Canberra Service Center.

  • Press the CLR/TEST key to return to Rate Mode (or wait about 10 seconds).


Checking the Alarm


At any time during the Clr/Test sequence of numbers:


  • Press the RATE key - the audio alarm should sound and the Rate LED, the lefth and one below the display, should turn on.

  • Press the DOSE key - the audio alarm should sound and the Dose LED, the right hand one below the display, should turn on.

  • Press the ALARM key - the audio alarm should sound and both LEDs should turn on.

  • If the optional vibrator alarm is installed, the unit will vibrate when any of these three keys is pressed.

    • Checking the Function Keys


    When the 000 display appears during the �esting the Display�sequence, press each function key in turn, except the ON/OFF key. The unit will beep and display the indications shown in the following table. Any other numerical indication indicates a fault in that key's circuit.



    Function Indication


    DOSE 0 0 2

    ALARM 0 1 0

    RATE 0 0 1

    LIGHT 0 2 0

    CLR/TEST 0 0 4




    2. The 'GN' located in the upper right corner of the display is used only by maintenance technicians. It's shown here so you can verify that the entire display is operating properly.


ENDING THE DISPLAY TEST



At the end of the test sequence, the blinking 9 will appear, indicating that the Rate Mode is operational. A blinking 0 indicates a failure; contact your local Canberra Service Center.


The unit will return to the Rate Mode in about ten seconds.

BACKLIGHT TEST



Press the LIGHT key; the display's backlight will turn on for about five seconds. This function is meant to be used in total darkness; the backlight may not be visible in daylight or normal room lighting.

SLEEP MODE TEST



Press and hold the RATE key, then press the ON/OFF key.


  • The characters SLP will be displayed briefly.

  • When you see ---, release both keys.

  • You'll see the SLEEP indicator at the top of the screen (Figure 5).

  • To wake the unit, press and hold the ON/OFF key until the SLEEP indicator disappears.

  • The unit will cycle through the 0-4 startup sequence, then return to the Rate Mode.

Figure 5 The Unit is Asleep



COMPLETING THE TESTS



When the UltraRadiac has passed all tests, the unit is ready for operation.
If the unit fails any of these Operational Verification Tests, contact your local Canberra Service Center.

GM TUBE FAILURE INDICATION



If the unit's Geiger-Mueller tube should stop counting, the display will flash, showing three rows of three dashed lines each (Figure 6).


Contact your local Canberra Service Center for repairs.


Figure 6 The GM Tube Has Failed



OPERATION AT LOW TEMPERATURES



At temperatures below -22¡F (-30¡C), it takes somewhat longer for characters to form on the display. The UltraRadiac automatically corrects for this by sensing the ambient temperature and increasing the display refresh time from two to five seconds. Operation of the UltraRadiac is otherwise unchanged.

ERROR DISPLAYS



Above 500 R/hr (5.0 Sv/h), the upper three-segment bar (---) on the display will begin flashing to indicate that:


  • The dose rate exceeds the range of the UltraRadiac.

  • The error might be greater than 20%.

  • The value of the displayed dose rate (and consequently of the calculated dose) is not accurate.

  • The "true rate" might be significantly higher than the displayed value.

5. Setting Up the Unit




This chapter has been written for the System Administrator, the person responsible for your organization's UltraRadiacs(TM). It describes each of the unit's functions and gives detailed instructions on how to set and enable the alarms. This is applicable only if the functions were not disabled by the optional Model S900 UltraRadiac Setup Software.

THE RATE MODE



To turn the UltraRadiac on, press and hold ON/OFF key until you see the Rate display in Figure 7.


Figure 7 The Rate Display












The Rate Alarms



There are two Rate Alarm Thresholds: Low Rate, for a minor hazard, and High Rate, for a severe hazard.


The alarm indicators will remain enabled as long as you remain in the radiation area that triggered the alarm.



High Threshold



There are several indicators for the High Rate Alarm Threshold (Figure 7).


  • Visual Enabled - The entire display and the left LED will flash quickly.

  • Audio Enabled - The audio will beep quickly.

  • Optional Vibrator Enabled - The unit will vibrate.


Low Threshold



There are several indicators for the Low Rate Alarm Threshold (Figure 7).


  • Visual Enabled - The RATE and ALARM indicators and the left LED will flash slowly.

  • Audio Enabled - The audio will beep slowly.

  • Optional Vibrator Enabled - The unit will vibrate.

The optional Vibrator Alarm can be used in addition to the audio and visual alarms when background noise makes the audio alarm hard to hear.



Clearing the Rate Alarms



The Rate Alarms are triggered when the measured rate exceeds either of the preset alarm thresholds.



Clearing the Low Rate Alarm



  • Press the CLR/TEST key to acknowledge the alarm condition and turn off the vibrator and the audio low rate alarm.

  • The Rate LED and the display's ALARM indicator will continue to flash slowly as long as the rate remains above the Low Rate Alarm threshold.


Clearing the High Rate Alarm



  • Press the CLR/TESTkey to acknowledge the alarm condition and turn off the vibrator.

  • The Rate LED, the audio alert, and the display's ALARM indicator will continue to flash quickly as long as the rate remains above the High Rate Alarm threshold.

  • When the Rate drops below the High Rate Alarm threshold, press the CLR/TEST key to turn off the High Rate Alarm visual and audio indicators.


Reading the Rate Alarm Thresholds



  • Press the ALARM and RATE keys.

  • You'll see an H, for High Level Alarm, displayed.

  • To read the Low Level Alarm setting, press the RATE key again; the display will show an L.

  • Press the CLR/TEST key; the flashing display will show the selected (HorL) alarm threshold setting.

  • If the optional Vibrator Alarm has been activated, the display will alternate between the threshold value and a vertically scrolling horizontal bar (���.

  • The unit will automatically return to the Rate Mode display about 10 seconds after the last keypress.


Changing the Rate Alarm Indicators



  • Press the ALARM and RATE keys.

  • You'll see an H, for High Level Alarm, displayed.

  • To change the Low Level indicators, press the RATE key again; the display will show an L.

  • Press the CLR/TEST key to access the selected (H or L) indicators.

  • Repeatedly press the ALARM key until you see the desired combination of indicators, AUDio, VISual, vibrator (���, or no indicators.

  • The unit will automatically return to the Rate Mode display about 10 seconds after the last keypress.


Changing the Rate Alarm Thresholds



To change the High level (H) or Low level (L) settings:


  • Press the ALARM and RATE keys.

  • You'll see an H, for High Level Alarm, displayed.

  • To access the Low Level Alarm settings, press the RATE key again; the display will show an L.

  • Press the CLR/TEST key; the flashing display will show the selected alarm level (H or L) settings.

  • If the optional Vibrator Alarm has been activated, the display will alternate between the threshold value and a vertically scrolling horizontal bar (- - -).


Changing the Alarm Indicators



To choose one or more of the alarm indicators for the selected alarm level:

  • Repeatedly press the ALARM key until you see the desired combination of indicators, AUDio, VISual, vibrator, or no indicators.


Setting the Alarm Threshold



To set the threshold for the selected alarm level (Figure 8):

  • Press the CLR/TEST key; the decimal point and the threshold unit indicator will begin to flash.

  • Repeatedly press the RATE key until the desired decimal point location and threshold unit indication are displayed.

  • Press the CLR/TEST key. This action will lock in the selected decimal point location and threshold unit indication.

  • The left-most digit will begin to flash.

  • Repeatedly press theRATEkey until the desired value of the digit is displayed.


Figure 8 Changing the Rate Alarm Threshold
















  • Press the CLR/TEST key to lock in the digit's value. The next digit will begin to flash.

  • Repeat the above two steps to select and lock in each of the two remaining digits.

  • When the last digit has been set, the entire threshold value and unit will flash.

  • Press the CLR/TEST key to return to the Rate Mode or wait about 10 seconds.


THE DOSE MODE



When the unit is on, dose data is continuously accumulated and updated every two seconds.


  • To enter the Dose Mode, press the DOSE key.

  • The Dose Mode display (Figure 9) will show you the dose that has accumulated since the unit's memory was last reset to zero.

Figure 9 A Typical Dose Display












The AUD and VIS display indicators will be seen only if the corresponding Dose Alarm mode and its indicator have been enabled. See Selecting the Dose Alarm Indicator below.



Clearing the Accumulated Dose



To clear the Accumulated Dose and reset its memory:


  • Press and hold the CLR/TESTand DOSE keys; the display will begin to flash.

  • When the flashing stops, release the CLR/TEST key.

  • The display shows all zeros; dose data will begin to accumulate again.


The Dose Alarms



There are two Dose Alarm thresholds: Low Dose, for a minor hazard, and High Dose, for a severe hazard.


The alarm indications will continue as long as you remain in the radiation area that triggered the alarm.


The optional Vibrator Alarm can be used inaddition to the audio and visual alarms when background noise makes the audio alarm hard to hear.



High Threshold



There are several indicators for the High Dose Alarm Threshold (Figure 9).


  • Visual Enabled - The DOSE and ALARM indicators and the right LED will flash quickly.

  • Audio Enabled - The audio will beep quickly.

  • Optional Vibrator Enabled - The unit will vibrate.


Low Threshold



There are several indicators for the Low Dose Alarm Threshold (Figure 9).


  • Visual Enabled - The ALARM indicator and the right LED will flash slowly.

  • Audio Enabled - The audio will beep slowly.

  • Optional Vibrator Enabled - The unit will vibrate.


Clearing the Dose Alarms



The Dose Alarms are triggered when the measured dose exceeds either of the preset alarm thresholds.



Clearing the Low Dose Alarm



  • Press the CLR/TEST key to acknowledge the alarm condition and turn off the vibrator and the audio low dose alarm.

  • The Dose LED and the display's ALARM indicator will continue to flash slowly until you reset the dose memory. See Clearing the Accumulated Dose.


Clearing the High Dose Alarm



  • Press the CLR/TESTkey to acknowledge the alarm condition and turn off the vibrator.

  • The Dose LED and the display will continue to flash quickly and the audio alert will continue to sound.

  • To turn off the flashing Dose LED and display, you'll have to reset the dose memory to zero. See Clearing the Accumulated Dose.


Reading the Dose Alarm Thresholds



  • Press the ALARM and RATE keys.

  • You'll see an H, for High Level Alarm, displayed.

  • To read the Low Level Alarm setting, press the DOSE key again; the display will show an L.

  • Press the CLR/TEST key; the flashing display will show the selected (H or L) alarm threshold setting.

  • If the optional Vibrator Alarm has been activated, the display will alternate between the threshold value and a vertically scrolling horizontal bar (���, showing that the vibrator alarm is active.

  • The unit will automatically return to the Dose Mode display about 10 seconds after the last keypress.


Changing the Dose Alarm Indicators



  • Press the ALARM and DOSE keys.

  • You'll see an H, for High Level Alarm, displayed.

  • To change the Low Level indicators, press the DOSE key again; the display will show an L.

  • Press the CLR/TEST key to access the selected (H or L) indicators.

  • Repeatedly press the ALARM key until you see the desired combination of indicators, AUDio, VISual, vibrator (���, or no indicators.

  • The unit will automatically return to the Dose Mode display about 10 seconds after the last keypress.


Changing the Dose Alarm Thresholds



To change the High level (H) or Low level (L) settings:


  • Press the ALARM and DOSE keys.

  • You'll see an H, for High Level Alarm, displayed.

  • To access the Low Level Alarm settings, press the DOSE key again; the display will show an L.

  • Press the CLR/TEST key; the flashing display will show the selected alarm level (H or L) settings.

  • If the optional Vibrator Alarm has been activated, the display will alternate between the threshold value and a vertically scrolling horizontal bar (���.


Setting the Alarm Thresholds



To set the threshold for the selected alarm level:


  • Press the CLR/TEST key; the decimal point and the threshold unit indicator will begin to flash.

  • Repeatedly press the DOSE key until the desired decimal point location and threshold unit indication are displayed.

  • Press the CLR/TEST key. This action will lock in the selected decimal point location and threshold unit indication.

  • The left-most digit will begin to flash.

  • Repeatedly press the DOSE key until the desired value of the digit is displayed.

  • Press the CLR/TESTkey to lock in the digit's value. The next digit will begin to flash.

  • Repeat the above two steps to select and lock in each of the two remaining digits.

  • When the last digit has been set, the entire threshold value and unit will flash.

  • Press the CLR/TEST key to return to the Dose Mode or wait about 10 seconds.

THE SOURCE FINDER MODE



The Source Finder Mode allows the unit to locate an isolated source. In this mode, the unit will start clicking if the unit is near radioactive material. As you move closer to the radioactivity (or farther away), the unit will click faster (or slower).


For best results, aim the top of the unit at the suspected source of the radiation.


The Rate and Dose modes are active when the Source Finder Mode is enabled. This means that you can read the higher Rate or Dose without exiting the Source Finder Mode.


Enabling the Source Finder Mode



  • Press and hold the RATE key until the display changes to a flashing 1.

  • Release the RATE key.

Exiting the Source Finder Mode



  • Press and hold the RATE key until the display changes to a flashing 0.

  • Release the RATE key.

THE SLEEP MODE



When the Sleep Mode is enabled, most of the unit's circuits will be turned off to conserve battery power. Every 5 minutes, the unit will wake up for 4-6 seconds and check the current Rate.


DO NOT place the unit in Sleep Mode before responding!

Doing so can expose you to radiation for as long as five minutes before you are alerted.



Enabling the Sleep Mode



  • Press and hold the RATE key, then press the ON/OFF key until you see SLP on the display.

  • When you see - - -, release both keys.

You'll see the SLEEP indicator at the top of the screen (Figure 10).


Figure 10 The Unit is Asleep













When the Unit Wakes Up



  • It compares the current Rate with the Rate Alarm thresholds.

  • If a Rate Alarm is triggered, the unit will stay awake.

  • If no Rate Alarm thresholds have been exceeded, the unit will go back to sleep for five minutes.

  • This wake-sleep cycle will repeat continuously until the Sleep Mode is cancelled.

Note: The unit does not accumulate Rate or Dose data while asleep.



When the Unit Wakes Up



To exit the Sleep Mode:

  • Press and hold the ON/OFF key until the unit starts cycling through the 0� startup sequence.

  • The unit will then enter the Rate Mode.


THE DATA LOGGING MODE



The Data Log lets you record up to 300 individual dose/rate data pairs, each with an index number, for later retrieval. This is useful for performing a survey or for cataloging readings.


Capturing Data Pairs



To capture data pairs, the unit must be ON and in the Rate Mode.


  • Press the RATE and DOSE keys together.

  • Hold both buttons down until the displayed number stops blinking (in about three seconds).

  • The next sequential rate/dose pair index number will appear.

  • Release both buttons. The unit will automatically return to the Rate Mode.

  • The current Dose and Rate pair’s data and its index number have been recorded.

  • To record another reading, point the unit at the location to be recorded and repeat the process.


Viewing the Data Log



To view the stored data, the unit must be OFF.


  • Press the RATE and OFF/ON keys together.

  • When the unit turns on, the last sequence number recorded will be displayed.

  • Press the RATE button to scroll down, or the DOSE button to scroll up, through the memory.

  • The first number in the display shown will be the index number, scrolling up (DOSE button) will next display the Rate data and scrolling up once again will display the Dose data.

  • Scrolling down (RATE button) will reverse the order of sequence numbers but will still display first Rate data then Dose data.

  • Scrolling will wrap around the memory, from first index entry to last, or last to first.


To return to normal operation, the unit must be turned off and then on again (normal turn on sequence).


When the 300th sequence number has been recorded, the unit will cycle back to the first sequence number and any new data records will overwrite the previously recorded data in that location.



Clearing the Data Log



To clear all stored data, you must be in the Viewing the Data Log mode. (See the previous section.)


  • While pressing both the RATE and ALARM keys, press and hold the CLR/TEST key for two seconds.

  • The first index number (0) will appear

  • This indicates that all data has been cleared.

  • To return to the Rate/Dose mode of operation, turn the unit OFF, then back ON.



6. Maintenance Procedures




Preventive maintenance consists of routine checks of the equipment before and after each mission, or as required by procedure.

Routine Checks Include:

  • Cleaning the unit.

  • Inspecting the battery compartment's door gasket.

  • Inspecting the battery contacts for corrosion.


CLEANING THE UNIT



Remove dust, moisture and loose dirt from the outside surfaces of the UltraRadiac(TM) with a clean soft cloth. If necessary, the unit may be cleaned with a mild solution of ordinary detergent and water, rinsed, and thoroughly dried.



THE BATTERIES



If you're installing batteries for the first time, the following caution can be disregarded. If you're replacing the batteries, be sure to turn the unit off first.

The UltraRadiac stores its current data in memory when it's turned off. To prevent possible data loss, you must turn the UltraRadiac off before removing the batteries.

Installing or Replacing the Batteries



  • To open the battery compartment door, turn its fastener a quarter-turn counter-clockwise, swing the door open and slide out all four batteries.

  • Install fresh batteries in the order shown in Figure 11.


Be sure to observe the polarity next to each of the four battery slots. The end of the battery facing out should match the slot's marked polarity, as shown in Figures 11 and 12.



Figure 11 Location of the Batteries






























Figure 12 The Battery Polarity Indicators

















THE BATTERY COMPARTMENT



To open the battery compartment door, turn its latch a quarter-turn counterclockwise and swing the door open.

  • Inspect the four battery contacts on the inside of the door (Figure 13). If any corrosion is seen, clean it off with a pencil eraser.

  • Inspect the seal on the inside of the door (Figure 13); it should be whole and entire. If the seal is cracked or broken, the unit may no longer be watertight.

  • Inspect the O-ring seal around the door latch's post (Figure 13). If the seal is cracked or broken, the unit may no longer be watertight.

  • For repair, contact your local Canberra Service Center.


    • Figure 13 The Inside of the Battery Door


















  • When the inspection is complete, close and latch the door. See the following section Latching the Compartment Door.


Latching the Compartment Door



Swing the battery cover closed, press it firmly against the unit and turn the fastener a quarter-turn clockwise.


Note: It may be necessary to turn the fastener slightly to line it up with the latch post before latch will engage.



When the door is properly closed, it will be possible to lay the fastener's D-ring down in the cover's fastener recess.


Note: When the door is latched, the unit may turn itself on in the Sleep Mode.


  • Press and hold the ON/OFF key for about 2 seconds.

  • The unit will cycle through the display startup sequence (page 15), then enter the Rate Mode.