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How to Use the IMI Inspector Alert

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

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How to Use the IMI Inspector Alert

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  1. How to Use the IMI Inspector Alert IMI International Medcom, Inc. 707-823-0336 http://medcom.com

  2. This presentation is intended to give the user a brief overview of how to operate the IMI Inspector Alert. For a complete understanding of this instrument please refer to the operating manual. International Medcom, Inc. 707-823-0336 www.medcom.com

  3. What the IMI Inspector Alert Does • The IMI Inspector Alert measures the rate of the following types of nuclear radiation • Alpha • Beta • Gamma • X-radiation • The IMI 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) IMI International Medcom, Inc. 707-823-0336 http://medcom.com

  4. How to Turn On the IMI Inspector Alert • Turn the IMI Inspector Alert on by moving the lower switch from Off to On or Audio. • On--The IMI Inspector Alert is measuring radiation but there is no audio. • Audio--The IMI Inspector Alert is measuring radiation, and beeping with each count of radiation that is detected. • When the IMI 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 IMI Inspector Alert updates its visual display once every three seconds. IMI International Medcom, Inc. 707-823-0336 http://medcom.com

  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. IMI International Medcom, Inc. 707-823-0336 http://medcom.com

  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 IMI Inspector Alert off. • Hold down the + button on the end panel while turning the Inspector Alert on. The menuicon 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. IMI International Medcom, Inc. 707-823-0336 http://medcom.com

  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 IMI 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. IMI International Medcom, Inc. 707-823-0336 http://medcom.com

  8. How to Determine the Average Background Count • Turn the IMI 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 00:10 (this means ten minutes). • Set the Timer switch to On. The IMI 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. IMI International Medcom, Inc. 707-823-0336 http://medcom.com

  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. IMI International Medcom, Inc. 707-823-0336 http://medcom.com

  10. One Way to Determine Where to Set the Alert • Use the IMI 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. IMI International Medcom, Inc. 707-823-0336 http://medcom.com

  11. How to Change the Battery • Turn the IMI 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. IMI International Medcom, Inc. 707-823-0336 http://medcom.com

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