Survey Meter Instrumentation

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Subgroup IV: Instrument Operations and Quality Control

Subgroup IV: Instrument Operations and Quality Control

Last updated 6:46 PM on 7/18/26
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9 Terms

1
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daily survey meter checks

  • battery check

  • background check

  • reference check / constancy measurement

2
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Why is it important to run a background check on the survey meter?

to ensure the unit is not contaminated

3
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reference check / constancy measurement procedure

  • hold probe up to reference source, usually located on the side of the meter

  • compare the reading to the correct calculated activity

4
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What should you do if the reference check fails on a survey meter?

do NOT use the survey meter

5
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How often are survey meters calibrated?

annually

6
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survey meter calibration procedure

  • use a high-activity source

  • determine expected readings at various distances, using the γ constant and attenuators

  • tweak potentiometers that control the rate meter needle on each scale

<ul><li><p>use a high-activity source</p></li><li><p>determine expected readings at various distances, using the γ constant and attenuators</p></li><li><p>tweak potentiometers that control the rate meter needle on each scale</p></li></ul><p></p>
7
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survey meter calibration acceptable limits

±20%

8
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Why would a survey meter perform poorly during annual calibration?

failure of potentiometer, batteries

9
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How do you know a survey meter is within its annual calibration date?

sticker on survey meter with date of last calibration; if out of date, do not use