2 MN1007-C
Contents
1 Introduction and Scope ...................................................................................................................................... 6
1.1 Introduction ................................................................................................................................................ 6
1.2 Scope ......................................................................................................................................................... 6
2 Naturally Occurring Radioactivity – an overview ................................................................................................ 6
2.1 Introduction ................................................................................................................................................ 6
2.2 Radioactivity in Oil and Gas Installations .................................................................................................... 7
3 Operational Options ........................................................................................................................................... 8
3.1 Probe Selection .......................................................................................................................................... 8
3.1.1 Geiger Müller End Window (Pancake) Probe ..................................................................................... 8
3.1.2 Scintillation Probe ............................................................................................................................. 11
3.2 NORM assessment criteria ...................................................................................................................... 13
3.2.1 Assessment using cps measurement ............................................................................................... 13
3.2.2 Assessment using surface activity (Bq/cm
2
) ..................................................................................... 13
3.2.3 Dose rate .......................................................................................................................................... 14
3.2.4 Specific activity ................................................................................................................................. 14
3.3 Background Measurement ....................................................................................................................... 15
4 Tracerco NORM Monitor-IS – Functional description ....................................................................................... 16
4.1 Handset monitor control keys ................................................................................................................... 16
4.2 Operating the instrument .......................................................................................................................... 20
4.2.1 Connecting the probes ..................................................................................................................... 20
4.2.2 Removing the probe ......................................................................................................................... 20
4.2.3 Switching on the instrument ............................................................................................................. 21
4.2.4 Start-up sequence illustration ........................................................................................................... 21
4.3 Measurement Modes for the Scintillator Probe. ........................................................................................ 22
4.3.1 cps Mode .......................................................................................................................................... 22
4.3.2 cps Minus Background Mode ........................................................................................................... 23
4.3.3 Dose Rate Mode .............................................................................................................................. 23
4.4 Modes of Operation for the Geiger Müller Probe. ..................................................................................... 24
4.4.1 cps Mode .......................................................................................................................................... 24
4.4.2 cps Minus Background Mode ........................................................................................................... 25
4.4.3 Becquerels per cm squared mode (Bq/cm
2)
...................................... ....................... ....................... .. 25
4.5 Integration Function ............................................................................................................................... .. 27
4.5.1 Example – Making an integrated count measurement in cps mode .................................................. 27
4.6 Alarm activation in integration mode ...................................................................................................... .. 28
4.7 Background Measurement ....................................................................................................................... 29
4.8 Alarm Configuration .......................................................................................................................... ....... 30
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