IEC 61172:1992

FOREWORD
Clause
SECTION 1: GENERAL
1.1 Scope and object
1.2 Normative references
1.3 Terminology and units
     1.3.1 Aerosols
     1.3.2 Environmental aerosol monitor
     1.3.3 Total equivalent window thickness
     1.3.4 Collection efficiency
     1.3.5 Conventionally true surface emission rate
     1.3.6 Indicated activity (AI)
     1.3.7 Activity per unit air volume
     1.3.8 Coefficient of variation
     1.3.9 Dynamic range
     1.3.10 Error of indication
1.3.11 Relative error of indication (E)
     1.3.12 Relative intrinsic error
     1.3.13 Effective range of measurement
     1.3.14 Response time
     1.3.15 Units
     1.3.16 Reference response
     1.3.17 Qualification tests
     1.3.18 Type tests
     1.3.19 Routine tests
     1.3.20 Acceptance tests
     1.3.21 Supplementary tests
     1.3.22 Minimum detectable activity
1.4 Classification of aerosol monitors
SECTION 2: AEROSOL MONITOR DESIGN
2.1 General
2.2 Measurement and indication characteristics
     2.2.1 Effective range of measurement
     2.2.2 Reading scale
     2.2.3 Minimum detectable activity
2.3 Check source
2.4 Air flow systems
     2.4.1 Pump
     2.4.2 Flow rate control
     2.4.3 Flow rate measurement
2.5 Alarms
     2.5.1 High level alarms
     2.5.2 Low level alarms
     2.5.3 Fault alarms
2.6 Ease of decontamination
2.7 Sampling and detection assembly
     2.7.1 Sampling inlets
     2.7.2 Air pump
     2.7.3 Aerosol retention device
     2.7.4 Radiation detector
2.8 Response to other ionizing radiations
2.9 Discrimination against natural radioactivity
     2.9.1 Methods of discrimination
     2.9.2 Electronic method of compensation
2.10 Operational indications
2.11 Provisions for operational testing
2.12 Setting-up and maintenance facilities
2.13 Control and electrical measurement assembly
2.14 Acoustic noise level of the assembly
2.15 Electrical interference
SECTION 3: TEST PROCEDURES
3.1 General
     3.1.1 Standard test conditions
     3.1.2 Tests performed under standard test
            conditions
     3.1.3 Tests performed with variation of influence
            quantities
     3.1.4 Statistical fluctuations
     3.1.5 Reference and special sources
     3.1.6 Radiation performance tests
3.2 Performance characteristics
     3.2.1 Reference response
     3.2.2 Relative intrinsic error
     3.2.3 Response as a function of beta radiation
            energy (beta monitors)
     3.2.4 Response as a function of alpha radiation
            energy (alpha monitors)
     3.2.5 Cross-response to alpha and beta radiation
     3.2.6 Effect of other radiations
     3.2.7 Response to ambient gamma radiation
     3.2.8 Response to gas activity
     3.2.9 Overload test
     3.2.10 Flow alignment
3.3 Electrical characteristics
     3.3.1 Statistical fluctuations
     3.3.2 Warm-up. Detection and measurement assembly
     3.3.3 Power supplies
     3.3.4 Power supply variations
     3.3.5 Power supply transient effects
     3.3.6 Stability of indication
     3.3.7 Alarm trip stability
     3.3.8 Alarm trip range
     3.3.9 Equipment failure alarms
3.4 Environmental performance characteristics
     3.4.1 Ambient temperature
     3.4.2 Relative humidity
     3.4.3 Atmospheric pressure
     3.4.4 Weather-proofing
3.5 Tests of the air circuit
     3.5.1 Leakage
     3.5.2 Flow rate stability
     3.5.3 Effect of filter pressure drop
     3.5.4 Effect of mains supply voltage
     3.5.5 Effect of power supply frequency
     3.5.6 Particle collection
SECTION 4: DOCUMENTATION
4.1 Type test report
4.2 Certificate
4.3 Operation and maintenance manual
TABLES

Applies to transportable or installed equipment for continuous monitoring of radioactive aerosols in the environment for both normal and accident conditions.