09/30195759 DC : 0
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
BS ISO 11704 - WATER QUALITY - MEASUREMENT OF GROSS ALPHA AND BETA ACTIVITY CONCENTRATION IN NON-SALINE WATER - LIQUID SCINTILLATION COUNTING METHOD
Hardcopy , PDF
08-31-2015
English
Foreword
1 Scope
2 Normative references
3 Symbols, definitions and units
4 Principle
5 Reagents and equipment
6 Sampling
7 Procedure
7.1 Direct counting
7.2 Thermal preconcentration
7.3 Sample preparation
7.4 Liquid scintillation measurement
7.4.1 Preparation of alpha and beta calibration
sources
7.4.2 Optimisation of counting conditions
7.4.3 Blank sample preparation and measurement
7.4.4 Alpha and beta efficiencies
7.4.5 Sample measurement
8 Expression of results
8.1 Calculation of activity per unit of mass
8.2 Standard uncertainty
8.3 Decision threshold
8.4 Detection limit
8.5 Confidence limits
8.6 Quality control
9 Interference control
9.1 Contamination
9.2 Losses of activity
9.2.1 Radon isotopes
9.2.2 Polonium
10 Test report
Bibliography
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