AS 2365.4-1995

1-AS 2365.4-1995 METHODS FOR SAMPLING AND ANALYSIS OF INDOOR AIR - DETERMINATION OF RADON
1-PREFACE
1-CONTENTS
2-FOREWORD
4-METHOD
4-SECTION 1 SCOPE AND GENERAL
4-1.1 SCOPE
4-1.2 PRINCIPLE
4-1.2.1 Method A
5-1.2.2 Method B
5-1.2.3 Method C
5-1.3 REFERENCED DOCUMENT
6-SECTION 2 COLLECTION IN SCINTILLATION CELLS AND MEASUREMENT OF ALPHA ACTIVITY (METHOD A)
6-2.1 APPARATUS
6-2.1.1 Scintillation cell
6-2.1.2 Vacuum pump
6-2.1.3 Photomultiplier tube (PMT)
6-2.1.4 Light-tight enclosure
6-2.1.5 Reference radon chamber or standard radium source
6-2.2 PROCEDURE
6-2.2.1 Calibration of scintillation cell
6-2.2.2 Sample collection
7-2.2.3 Measurement of alpha activity
7-2.3 CALCULATIONS
9-SECTION 3 ADSORPTION ONTO ACTIVATED CHARCOAL AND MEASUREMENT OF GAMMA RADIATION (METHOD B)
9-3.1 REAGENT
9-3.2 APPARATUS
9-3.2.1 Sample container
9-3.2.2 Diffusion barrier
9-3.2.3 Lead-shielded NaI(Tl) gamma-ray detector
9-3.2.4 Pulse amplifier and multi-channel pulse height analyser (MCA)
9-3.2.5 Radium (Ra) standard solution
9-3.2.6 Radon test chamber
9-3.3 PROCEDURE
9-3.3.1 Preparation of radon monitor
10-3.3.2 Calibration
11-3.3.3 Sample collection
11-3.3.4 Measurement of gamma-ray peaks
12-3.4 CALCULATIONS
13-SECTION 4 SOLID-STATE NUCLEAR TRACK MONITORING (METHOD C)
13-4.1 REAGENTS
13-4.1.1 Potassium hydroxide solution
13-4.1.2 2% acetic acid solution
13-4.1.3 Distilled water
13-4.2 APPARATUS
13-4.2.1 Detector
13-4.2.2 Marking tool
13-4.2.3 Sample containers
13-4.2.4 Sample holding block
13-4.2.5 Beakers or other suitable containers
13-4.2.6 Heating system
13-4.2.7 Desiccator or other low temperature drying device
14-4.2.8 Viewing system
14-4.3 PROCEDURE
14-4.3.1 Preparation of monitor
14-4.3.2 Sample collection
14-4.3.3 Etching of detectors
15-4.3.4 Counting of tracks
15-4.4 CALCULATION
16-SECTION 5 PRECISION AND TEST REPORT
16-5.1 PRECISION
16-5.2 TEST REPORT
17-APPENDIX A - URANIUM DECAY SERIES
19-APPENDIX B - DETERMINATION OF RADON PROGENY CONCENTRATIONS BY MEMBRANE FILTER COLLECTION AND MEASUREMENT OF ALPHA ACTIVITY
19-B1 SCOPE
19-B2 PRINCIPLE
19-B3 APPARATUS
19-B3.1 Air pump
19-B3.2 Filter holder
19-B3.3 Membrane filters or supported membrane filters
20-B3.4 Flowmeter
20-B3.5 Stopwatch or other timing device of equivalent accuracy
20-B3.6 Scintillation counter
20-B4 PROCEDURE
20-B4.1 Calibration procedure
20-B4.2 Sample collection
20-B4.3 Measurement of alpha activity
21-B4.3.1 Single count method
21-B4.3.2 Four count method
21-B5 CALCULATIONS
21-B5.1 Single count method
21-B5.2 Four count method
21-B5.2.1 Individual activity concentrations
22-B5.2.2 Potential alpha energy concentration (PAEC)
22-B6 PRECISION
22-B7 TEST REPORT