Sigma BM-286A service manual Formulas, Activity from Counts

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APPENDIX C. FORMULAS page 45

C. FORMULAS

The following formulas are used in various systems manufactured by TSA Systems, Ltd. They are provided to assist in verifying system operation and to give our customers a better understanding of how the systems operate

C.1. ACTIVITY FROM COUNTS

Where:

Activity = Activity in nCi

Eff = Decimal efficiency (i.e. 10% = 0.1.)

N = Net counts per second (cps – background cps)

C.2. EFFICIENCY

Where:

N = cps with source – background cps

activity = test source activity in nCi

C.3. N*SIGMA ALARM LEVEL

This formula calculates the minimum activity, in disintegrations per minute, that can be reliably detected under a given set of operational conditions.

Where:

bkg = Background counts

Sigma = 1bkg

N = N*Sigma value

Model BM-286A

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Contents Waste Monitor Model BM-286A Table of Contents Inspection and InstallationMaintenance Theory of OperationTroubleshooting Appendix Warranty Glossary FormulasConfiguration Tracking Sheet Parts Recommended Spare Parts Spare Parts Ordering InformationIntroduction Scope and Purpose of ManualSpecifications Introduction Introduction Inspection Installation Operating Instructions General OverviewPOWER-UP and SELF-TESTS Access Menu Level One AccessPCA-II Normal Operation Operating Instructions Programming the System SET-UP Menu AbcdefghOperating Instructions Operating Instructions Waste Stream Parameters Operating Instructions Operating Instructions Operating Instructions This value is used only when the Alarm Type is set to DPM Utilities Menu Operating Instructions Reports Initial Installation Checklist Operating Instructions BM-286A Waste Stream SET-UP Worksheet Unit Operation Theory of Operation Theory of Operation Theory of Operation Theory of Operation Operator Maintenance Maintenance Maintenance Settings for Plastic Detectors LLDULD Weight Calibration Maintenance Diagnostic Aids Fault Isolation Computers Longs Peak Court LONGMONT, Colorado Appendix B. Glossary Appendix B. Glossary Activity from Counts Reliable Detectable Activity RDA Formula Variance Configuration Tracking Sheet System ModificationsLongs Peak Court LONGMONT,COLORADO Drawings