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Table of Contents
Section 1: General Information................................................................................... 1-1
1.1 Introduction ............................................................................................................................ 1-1
1.2 Features................................................................................................................................. 1-1
1.3 Before you Start - Safety Precautions.................................................................................... 1-2
1.4 Safety Symbols and Terms....................................................................................................1-2
1.5 Manual Addenda.................................................................................................................... 1-3
1.6 Specifications......................................................................................................................... 1-3
1.7 Unpacking and Inspection...................................................................................................... 1-7
Section 2: Theory Of Operation.................................................................................. 2-1
2.1 Introduction ............................................................................................................................ 2-1
2.2 Functional Description............................................................................................................ 2-1
2.2.1 Power Supply .................................................................................................................. 2-2
2.2.2 Front Panel...................................................................................................................... 2-2
2.2.3 MicroController ................................................................................................................ 2-2
2.2.4 Serial Communications Port............................................................................................ 2-2
2.2.5 Electrometer .................................................................................................................... 2-2
2.2.6 Bias Supply...................................................................................................................... 2-3
2.2.7 Multiplexer and A/D Converter ........................................................................................ 2-3
2.3 Basic Operating Equations .................................................................................................... 2-3
2.3.1 Setting Thresholds........................................................................................................... 2-7
2.3.2 Exposure Time ................................................................................................................ 2-8
2.3.3 Air Density Correction Factor .......................................................................................... 2-9
Section 3: Operation.................................................................................................... 3-1
3.1 Setup...................................................................................................................................... 3-1
3.2 Front Panel Familiarization .................................................................................................... 3-1
3.3 Rear Panel Familiarization..................................................................................................... 3-2
3.4 Powering the System............................................................................................................. 3-2
3.5 Power-Up Self-Test and Display Messages .......................................................................... 3-3
3.6 Ion Chamber Connector......................................................................................................... 3-3
3.7 Basic Measurement Techniques............................................................................................ 3-4
3.7.1 General Considerations................................................................................................... 3-4
3.7.2 Making Non-Timed Exposure Measurements................................................................. 3-4
3.7.3 Making Timed Exposure Measurements............................................................3-5
3.7.4 Using Other Ion Chambers.............................................................................................. 3-6
3.8 Battery Care........................................................................................................................... 3-6
3.9 Operation Instructions............................................................................................................ 3-7
3.9.1 Front Panel Controls........................................................................................................ 3-7
3.9.2 Powering Up the Model 35040 Therapy Dosimeter ........................................................ 3-8
3.9.3 Powering Down the Model 35040 Therapy Dosimeter.................................................... 3-9
3.9.4 Using the Test Function Button ....................................................................................... 3-9
3.9.5 Automatic Leakage Compensation ............................................................................... 3-11
3.9.6 Timer Setup................................................................................................................... 3-13
3.9.7 Setting Thresholds......................................................................................................... 3-13
3.9.8 Using the Detector Select Button .................................................................................. 3-14
3.9.9 Using the Air Density Button.......................................................................................... 3-14
Section 3: Operation .............................................................................................. 3-1
3.9.10 Using the Units Select Button........................................................................................ 3-15
3.9.11 Using the Bias Select Button......................................................................................... 3-15