International Medcom 7078230336

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

• The Inspector Alert measures the rate of the
  following types of nuclear radiation
• Alpha
• Beta
• Gamma
• X-radiation
• The Inspector Alert measures the amount of
  nuclear radiation in
• Counts per minute (CPM)
• Counts per second (CPS)
• MilliRoentgens per hour (mR/hr)
• MicroSieverts per hour
• (µSv/hr)

4
How to Turn On the Inspector Alert

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

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 mode the Inspector Alert starts totaling
  the counts it registers, and the numeric display
  is updated each time a count is registered.
• The CPM 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 Inspector Alert off.
• Hold down the button on the end panel while
  turning the Inspector Alert 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 Inspector Alert is on it is
  normally measuring the background count.
• A user should determine the normal background
  count in case abnormal levels of nuclear
  radiation occur.

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

• Turn the Inspector Alert On, and put it in Total
  mode.
• Set the Timer switch on the end panel to Set.
• Press the button until the display reads 0010
  (this means ten minutes).
• Set the Timer switch to On. The Inspector Alert
  beeps three times and starts counting.
• At the end of the ten minutes, the Inspector
  Alert beeps three times, and repeats beeping
  several times. Note the total reading.
• Divide this number by ten for the average count
  per minute which is the average background count
  per minute.

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 Inspector Alert 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.

11
How to Change the Battery

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