IEC 61263:1994

FOREWORD
SECTION 1: GENERAL
Clause
1.1 Scope and object
1.2 Normative references
1.3 General characteristics
1.4 Terminology and units
     1.4.1 Potential alpha energy
     1.4.2 Portable potential alpha energy meter
     1.4.3 Aerosols
     1.4.4 Active deposit
     1.4.5 Thin radioactive source
     1.4.6 Surface emission rate of a source
     1.4.7 Total equivalent window thickness
     1.4.8 Conventionally true value of a quantity
     1.4.9 Error of indication
     1.4.10 Relative error of indication
     1.4.11 Relative intrinsic error
     1.4.12 Coefficient of variation
     1.4.13 Units
     1.4.14 Reference response
     1.4.15 Qualification tests
     1.4.16 Acceptance tests
SECTION 2: TECHNICAL CHARACTERISTICS
2.1 General
     2.1.1 Sampling and detection sub-assembly
     2.1.2 Control and measurement sub-assembly
     2.1.3 Power supply sub-assembly
     2.1.4 Mode of expression of read-out sub-assembly
     2.1.5 Mass and dimensions
     2.1.6 General construction
     2.1.7 Range of measurement
2.2 Technical characteristics of the sampling and
     detection sub-assemblies
     2.2.1 Sampling device
     2.2.2 Aerosol retention device
     2.2.3 Radiation detection unit
     2.2.4 Air pump
     2.2.5 Exhaust device
     2.2.6 Air volume, flow-rate monitoring and
            control devices
2.3 Technical characteristics of the control and
     measurement sub-assemblies
     2.3.1 Electronic measuring devices
     2.3.2 Measurement indication devices
     2.3.3 Automatic operation unit
     2.3.4 Electrical control unit
     2.3.5 Operational indicators
SECTION 3: TEST PROCEDURES
3.1 General
     3.1.1 Definition of test conditions
     3.1.2 Test sources
3.2 Performance characteristics
     3.2.1 Reference response
     3.2.2 Response to reference sources
     3.2.3 Response to standard reference atmospheres
     3.2.4 Response to ambient gamma radiation
3.3 Electrical characteristics
     3.3.1 Statistical fluctuations
     3.3.2 Power supplies
     3.3.3 Stability of indication of detection and
            electronic measurement sub-assemblies
3.4 Environmental characteristics
     3.4.1 Ambient temperature
     3.4.2 Relative humidity
     3.4.3 Atmospheric pressure
3.5 Tests of the sampling assembly
     3.5.1 Tests of the air circuit
     3.5.2 Flow-rate control
     3.5.3 Warm-up time
     3.5.4 Estimation of the external leakage flow-rate
     3.5.5 Effect of supply voltage variations
SECTION 4: DOCUMENTATION
4.1 Type tests report
4.2 Identification certificate
Tables
Annex A - Methods for measuring the potential alpha
          energy concentration (PAEC) of airborne radon
          decay products

Sets forth the requirement for a portable instrument for the rapid measurement of the volume potential alpha energy due to the decay product of radon 222Rn in the air of underground mines.