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iation Safety Officer Course Module 1.7 – Radiation Detection and Measurement
PART 1
BASIC KNOWLEDGE
MODULE 1.7
RADIATION DETECTION AND MEASUREMENTS
CONTENTS
OVERVIEW...................................................................................................1
LEARNING OBJECTIVES ............................................................................1
1. MECHANISMS USED FOR DETECTING RADIATION........................2
1.1 Ionization ........................................................................................2
1.2 Scintillation .....................................................................................2
1.3 Thermoluminescence .....................................................................2
1.4 Chemical Mechanisms....................................................................3
1.5 Heating ...........................................................................................3
1.6 Biological Mechanisms ...................................................................3
1.7 Summary of Detection Mechanisms ...............................................3
SELF-CHECK 1 ............................................................................................4
2. DETECTORS BASED ON IONIZATION ..............................................4
2.1 Gas-Filled Detectors .......................................................................4
2.1.1 How they work .........................................................................5
2.1.1.1 The recombination region ....................................................6
2.1.1.2 Ion chamber region..............................................................6
2.1.1.3 Proportional region ..............................................................6
2.1.1.4 Geiger-Müller region ............................................................7
2.1.1.5 Continuous discharge region ...............................................7
SELF-CHECK 2 ............................................................................................7
2.1.2 Resolving time, dead time and recovery time ..........................8
2.1.3 Types of gas-filled detectors....................................................9
2.1.3.1 Ionization chambers ............................................................9
2.1.3.2 Proportional Counters........................................................10
2.1.3.3 Geiger-Müller (G-M) counters............................................11
2.1.4 Summary of gas-filled detectors ............................................12
SELF-CHECK 3 ..........................................................................................13
2.2 Solid State Conductivity Detectors ...............................................14
2.2.1 How they work .......................................................................15
King Faisal Specialist Hospital and Research Centre – Biomedical Physics Department i
PART 1
BASIC KNOWLEDGE
MODULE 1.7
RADIATION DETECTION AND MEASUREMENTS
CONTENTS
OVERVIEW...................................................................................................1
LEARNING OBJECTIVES ............................................................................1
1. MECHANISMS USED FOR DETECTING RADIATION........................2
1.1 Ionization ........................................................................................2
1.2 Scintillation .....................................................................................2
1.3 Thermoluminescence .....................................................................2
1.4 Chemical Mechanisms....................................................................3
1.5 Heating ...........................................................................................3
1.6 Biological Mechanisms ...................................................................3
1.7 Summary of Detection Mechanisms ...............................................3
SELF-CHECK 1 ............................................................................................4
2. DETECTORS BASED ON IONIZATION ..............................................4
2.1 Gas-Filled Detectors .......................................................................4
2.1.1 How they work .........................................................................5
2.1.1.1 The recombination region ....................................................6
2.1.1.2 Ion chamber region..............................................................6
2.1.1.3 Proportional region ..............................................................6
2.1.1.4 Geiger-Müller region ............................................................7
2.1.1.5 Continuous discharge region ...............................................7
SELF-CHECK 2 ............................................................................................7
2.1.2 Resolving time, dead time and recovery time ..........................8
2.1.3 Types of gas-filled detectors....................................................9
2.1.3.1 Ionization chambers ............................................................9
2.1.3.2 Proportional Counters........................................................10
2.1.3.3 Geiger-Müller (G-M) counters............................................11
2.1.4 Summary of gas-filled detectors ............................................12
SELF-CHECK 3 ..........................................................................................13
2.2 Solid State Conductivity Detectors ...............................................14
2.2.1 How they work .......................................................................15
King Faisal Specialist Hospital and Research Centre – Biomedical Physics Department i
