International Medcom 7078230336

1
How to Use the Radalert 100
2
This presentation is intended to give the user a
brief overview of how to operate the Radalert
100. For a complete understanding of this
instrument please refer to the operating manual.
3
What the Radalert 100 Does

• The Radalert 100 measures the rate of the
  following types of nuclear radiation
• Alpha
• Beta
• Gamma
• X-radiation
• The Radalert 100 measures the amount of radiation
  in
• Counts per minute (CPM CPS) or
• MilliRoentgens per hour (mR/hr) or MicroSieverts
  per hour (µSv/hr).
• The Radalert 100 can audibly alert the user when
  a pre-determined level of nuclear radiation
  occurs.

4
How to Turn On Radalert 100

• Turn the Radalert 100 on by moving the lower
  switch from Off to On or Audio.
• On--The Radalert 100 is measuring radiation but
  there is no audio.
• Audio--The Radalert 100 is measuring radiation,
  and beeping with each count of radiation that is
  detected.
• When the Radalert 100 is first turned on it does
  a 3 second system check, displaying all the
  indicators and numbers.
• After the system check is finished the Radalert
  100 shows the current radiation level.

5
How to Select the Operating Mode

• Move the upper switch to
• Total / Timer
• CPM / CPS (counts per minute or counts per
  second).
• mR/hr or µSv/hr (milliRoentgen per hour or
  microSievert per hour).
• In Total / Timer mode the Radalert 100 starts
  totaling the counts it registers, and updates the
  numeric display each time it registers a count.
• In the CPM / CPS and mR/hr / µSv/hr modes the
  numeric display is updated every three-seconds.
• The CPM / CPS mode is the easiest to understand.

6
How to Switch the Modein the Utility Menu

• To switch the mode from mR/hr to µSv/hr and from
  CPM to CPS
• Turn the Radalert 100 off.
• Hold down the button on the end panel while
  turning the Radalert 100 on. The menu icon will
  appear at the lower right corner.
• Scroll through the numbers on the screen by
  pushing the and - buttons until you get to 2.
• Press the SET button on the end panel. Press
  for mR/hr (CPM) and - for µSv/hr (CPS).
• Press the SET button twice.

7
What is Background Count?

• The background count is the normal level of
  nuclear radiation that is occurring at a given
  time and place.
• Some sources of background radiation are
• The sun
• Minerals in the earth
• Residual radiation from nuclear testing and other
  man made sources
• Nuclear radiation is a naturally occurring
  phenomenon. When the Radalert 100 is on it is
  normally measuring the background count.
• A user should determine the normal background
  count to be able to set the appropriate alarm
  level in the case of abnormal levels of nuclear
  radiation.

The mesh screen covers the end window of the
Geiger-Mueller sensor.
8
How to Determine the Average Background Count

• Turn the Radalert 100 on, and put it in CPM / CPS
  mode.
• Wait one minute until the hourglass icon on the
  left side of the screen disappears. After this
  icon disappears the Radalert 100 updates every
  three-seconds.
• Take 30 consecutive minute readings and record
  each of the readings.
• Add together each of the readings and divide this
  number by 30 (the length of your timed count).
• This number is the average background count.

9
Considerations Involved in Finding the Best Level
to Set the Alert

• The ideal alert setting provides enough
  sensitivity to detect any increase in the
  radiation level above naturally occurring
  background levels without false alarms caused by
  normal random variations in the background
  radiation level.
• A good setting for one location may cause alerts
  in another location since background radiation
  levels can vary due to
• altitude
• geography
• radon gas
• radioactive materials in buildings
• mineral content in soil and rocks
• Each user should balance the need for sensitivity
  against false alarms occurring from local
  geography and conditions.
• A good alert level can be developed
  experimentally or through the formula found on
  the next slide.
• Use this number and adjust it as necessary for
  local conditions.

10
One Way to Determine Where to Set the Alert

• Use the Radalert 100 in CPM / CPS mode to measure
  counts for 30 consecutive minutes.
• Record each reading.
• Add the readings and divide the sum by 30.
• Find the difference between each reading and the
  average.
• Square each of these differences (multiply it by
  itself).
• Total the squares of the differences and divide
  the sum by 29.
• Find the square root of this sum. This number is
  the standard deviation.
• Multiply the standard deviation by 4 and add this
  number to the average from step 3 above. Set the
  alert level to this number.

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How to Set the Alert

• Put the Radalert 100 in CPM / CPS mode.
• Press the Set button on the end panel. A nuclear
  radiation icon will appear on the left side of
  the screen.
• Use the or - buttons to set the alert level to
  the desired setting.
• Press the Set button twice. The nuclear icon
  remains on. This icon means that the alert is
  set.
• Each time you turn the Radalert 100 on you will
  have to turn on the alert feature, but the
  setting will remain the same.

12
How to Change the Battery

• Turn the Radalert 100 over.
• Remove the battery cover.
• Detach the 9 volt alkaline battery from the wire
  connector and replace.
• The battery life for the Radalert 100 is
  approximately 2,160 hours at normal background,
  average 625 hours at 1 mR/hr with beeper off.