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Fluke TRACKER 90100 Operator's Manual

Radiation measurement system
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Model 90100
™
TRACKER
System
Operators Manual
May 2006
Manual No. 37826 Rev. 9
©2006 Fluke Corporation, All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies

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Summary of Contents for Fluke TRACKER 90100

  • Page 1 Model 90100 ™ TRACKER System Operators Manual May 2006 Manual No. 37826 Rev. 9 ©2006 Fluke Corporation, All rights reserved. Printed in U.S.A. All product names are trademarks of their respective companies...
  • Page 2 Fluke Biomedical Radiation Management Services 6045 Cochran Road Cleveland, Ohio 44139 440.498.2564 www.flukebiomedical.com/rms...

  • Page 3: Table Of Contents

    Table of Contents Section 1: General Information ..................1-1 Introduction ....................1-1 Features....................... 1-2 Before You Start - Safety Precautions ............1-3 Safety Terms ....................1-3 Manual Addenda..................1-3 Specifications....................1-3 1.6.1 Model 35300A Detector................1-3 1.6.2 Model 35360A Tracker Display .............. 1-5 1.6.3 Interface Cable –...
  • Page 4 Section 3: Theory of Operation ..................3-1 Introduction ....................3-1 Overall Function Description Of The Model 35360A TRACKER Display ..3-1 3.2.1 Power Supply ..................3-2 3.2.2 300 Volt Electronic Bias Supply.............. 3-3 3.2.3 Front Panel Switches................3-3 3.2.4 Processor ....................3-3 3.2.5 VFD Display ...................

  • Page 5: Section 1: General Information

    General Information Introduction Section 1 General Information 1.1 Introduction The Model 90100 TRACKER is a radiation measurement system intended for use in quality assurance programs for high-energy accelerators and Co machines. While its ease of operation makes it ideal for daily checks of beam constancy, symmetry, and flatness, its portability makes it a good choice for field service engineers and consulting physicists.

  • Page 6: Features

    Model 90100 Operators Manual cable is of a design that provides a high degree of flexibility and allows it to flatten to fit under a treatment room entrance door. Included with each 90100 TRACKER System is an MS-DOS based Customization program that provides a means of performing field customization and calibrations.

  • Page 7: Before You Start - Safety Precautions

    General Information Before You Start- Safety Precautions 1.3 Before You Start - Safety Precautions This product is designed for quality assurance testing of therapeutic radiation treatment machines. It is not for machine calibration nor is it intended as a substitute for a precision dosimeter system (Farmer-type Probe and Electrometer with official calibration).
  • Page 8 Model 90100 Operators Manual Recommended Operation Conditions Source Distance: 100 cm Collimated Field Size: 25 × 25 cm Source Dose Rate Range: 50 to 500 rads/min Nominal Ion Chamber Characteristics Wall and Window Material: Continental Polymers ACRYCAL-CP or equivalent Window Area Density: 600 mg/sq cm (0.51 cm acrylic plastic) Window Transmission: 95% for 662 keV photons;...

  • Page 9: Model 35360A Tracker Display

    100 rad/min. Source noise effects during dose rate measurements on a linear accelerator may be excessive. Measurement Accuracy: Fluke Biomedical factory calibration will provide a basic Charge (Current) measurement accuracy of ±1% of reading ± 0.3 nC (± 0.3 nC /min) exclusive of long-term drift and temperature effects.

  • Page 10: Interface Cable - Detector To Display

    Model 90100 Operators Manual Offset Temperature Drift: The zero offset voltage will drift less than ± 1 count at the display over the operating range of 10°C to 35°C. High Performance Battery Charger Battery Type and Capacity: 6V (3 cell) Lead Acid (5 AH) provide 8 hours of continuous operation. Recharge Time: Fast recharge time on the order of 2 - 3 hours even during operation.
  • Page 11 General Information Unpacking and Inspection Standard System Contents • Model 35360A TRACKER Display • Model 35300A Detector • 15 m Detector to Display Interface Cable (37783-15) • AC Line Cord • Customization Software Kit (37827): Contains disk, cable, and adapters. Optional Equipment •...
  • Page 12 Model 90100 Operators Manual (Blank page)

  • Page 13: Section 2: Operation

    Operation Introduction Section 2 Operation 2.1 Introduction This section contains set-up and connection procedures for the Model 90100 TRACKER System in order to measure therapy beam characteristics. If you want to use build-up to simulate tissue, you can put plates of either "solid water" or acrylic (optional accessories) securely on one or both sides of the Model 35300A Detector.

  • Page 14: Powering The System

    Model 90100 Operators Manual 2.2.1 Powering the System The Model 35360A TRACKER Display may be operated from either line or battery power. The line receptacle at the rear panel of the Model 35360A TRACKER Display mates with a 3-wire line cord to provide a connection to line voltage (high, neutral and earth ground).
  • Page 15 Operation Real Panel Familiarization Display. Be sure to use the correct end of the cable. 3. Secure the cable at each end by twisting the thumbscrews in a clockwise direction until tight. Model 35300A Detector To Model 35360A TRAKCER Display Figure 2-2.

  • Page 16: Positioning The Model 35300A Detector In The Beam

    Model 90100 Operators Manual 4. Power can now be applied to the system. Wait for the Test/Detector screen shown below before pressing any keys. Reverse the above procedure to disconnect the interface cable from the 35300A Detector. WARNING Always turn the Model 35360A TRACKER Display's power off prior to connecting or disconnecting the interface cable.
  • Page 17 Operation Positioning the Model 353300A Detector in the Beam Gantry Treatment head Model 35300A Gantry Detector Treatment To Model 35360A table TRACKER Display Treatment table Cable Gantry To Model 35360A TRACKER Display Figure 2-4. Setup for 0-Degree Gantry Angle (NOTE: Build-up not shown for clarity) For those who have purchased the optional Build-Up Peg and Retainer Kit, gantry angles other than 0 degrees may be used.

  • Page 18: Operation Instructions

    Model 90100 Operators Manual Gantry arm Gantry Model Treatment 35300A head Detector Treatment table Cable to 35360A TRACKER Display 90 degrees Cable Gantry Treatment table To 35360A TRACKER Display 270 degrees Figure 2-5. Setup for 90- and 270-Degree Angles (NOTE: Build-up not shown for clarity) 2.4 Operation Instructions This section contains detailed instructions on the front panel operation of the Model 35360A TRACKER Display.
  • Page 19 Operation Operation Instructions Radiation Measurements TRACKER DISPLAY Model 35360A TURN POWER OFF PRIOR TO CONNECTING AND DISCONNECTING DETECTOR CABLE Figure 2-6. The Model 35360A TRACKER Display Front Panel Power The POWER button toggles the system power on or off. Test/Detector The TEST/DETECTOR button displays and sequences the Test/Detector screens.

  • Page 20: Powering Up The Model 35360A Tracker Display

    Model 90100 Operators Manual 2.4.2 Powering Up the Model 35360A TRACKER Display Pressing the POWER button turns on the instrument. Initially, it runs self-tests, restores the temperature, pressure, air density correction factor, front panel gain factors and measurement units to their previous values, and waits for the bias supply to stabilize.

  • Page 21: Using The Units Select Button

    Operation Operation Instructions Figure 2-9. Test/Detector Screen 2 - Ion Chamber Calibration Factors Figure 2-10. Test/Detector Screen 3 - Bias and Battery Voltages Plus an Option Text Line In Figure 2-10, the battery current, "+0.1 A", is displayed to the right of the battery voltage, "6.8 V". A positive current value of up to 2.5 amperes indicates that the battery is being charged from the AC line.

  • Page 22: Using The Air Density Button

    Model 90100 Operators Manual 2.4.6 Using the AIR DENSITY Button Pressing the AIR DENSITY button displays the Air Density screen, see Figures 2-12 and 2-13. This screen contains the temperature value, pressure value, and Air Density Correction Factor (ADCF). Press the AIR DENSITY button to advance the "...

  • Page 23: Using The Measure Select Button

    Operation Operation Instructions NOTE The FPGF for the center ion chamber is displayed on the bottom line of the VFD. Use the UP and DOWN buttons to toggle the FPG annunciator on or off. The FPG annunciator in the upper right-hand corner of the display signifies that FPG corrections are enabled, see Figure 2-15. When the FPG annunciator appears, the 35360A TRACKER Display multiplies each ion chamber's exposure value by its FPGF before displaying the reading.

  • Page 24: Percent-Of-Center Measurements

    Model 90100 Operators Manual Figure 2-18. An Absolute Rate Measurement With Air Density Corrections and the Front Panel Gain Factors Disabled Prior to making a dose measurement, press the RESET button to zero all ion chamber readings. Pressing this button has no affect when performing dose rate measurements. 2.4.8.2 Percent-of-Center Measurements The Percent-of-Center Measurement screen displays the central ion chamber's reading in absolute measurement units and the four peripheral ion chamber's readings as a percentage of the center ion...

  • Page 25: Underranging And Overranging Conditions

    Operation Operation Instructions 2.4.8.3 Underranging and Overranging Conditions The 35360A TRACKER Display displays an underrange indicator when a preset threshold has not yet been reached, and an overrange indicator when the electrometer’s maximum limit has been exceeded (see Figures 2-22 and 2-23). An underrange occurs in the percent-of-center measurement mode when the central exposure is too small to precisely calculate percentages.

  • Page 26: Gain Setting Mode

    Model 90100 Operators Manual Figure 2-24 illustrates the locations of the annunciators on the VFD. The High Bias annunciator would appear in place of the Low Bias annunciator should this condition be detected. Figure 2-24. Positions of the Battery and Bias Annunciators See Section 4 for information on how to deal with the LoBat, HiBias, and LoBias conditions.

  • Page 27: Changing Front Panel Gain Factor's From The Measurement

    Operation Operation Instructions 2.4.10.1 Changing Front Panel Gain Factor's From the Measurement Screen The five FPGF's may be set by adjusting the measurement readings to achieve a set of desired values. Press the MEASURE SELECT button until the desired Measurement screen is displayed. Press the GAIN SELECT button to advance the "...
  • Page 28 Model 90100 Operators Manual (Blank page)

  • Page 29: Section 3: Theory Of Operation

    Theory of Operation Introduction Section 3 Theory of Operation 3.1 Introduction The Model 90100 TRACKER System is a radiation measurement system intended for use in quality assurance programs for high-energy accelerators and Co . The two main components of the system are the Model 35300A Detector and the Model 35360A TRACKER Display.

  • Page 30: Power Supply

    Model 90100 Operators Manual BATTERY STATUS Figure 3-1. Hardware Block Diagram of the Model 35360A TRACKER Display 3.2.1 Power Supply The Power Supply converts AC line power in the range of 100 to 240 VAC, or 6 VDC from the internal rechargeable battery pack, to the various DC voltage levels that are used to power all of the other blocks of the system.

  • Page 31: 300 Volt Electronic Bias Supply

    Theory of Operation Overall Functional Description of the Model 35360A Tracker Display 3.2.2 300-VOLT Electronic Bias Supply The 300 volt ionization potential is generated internally by an electronic bias supply circuit. The supply eliminates the need for the 35360A TRACKER Display to contain high voltage batteries. As explained below, the ion chamber collector and guard are maintained at the same potential as the chassis of the 35360A TRACKER Display, and the ion chamber bias plates are negatively biased at 300 VDC.

  • Page 32: Serial Communications Port

    Model 90100 Operators Manual 3.2.6 Serial Communications Port A computer interface has been provided in the form of a DCE configured RS-232 port. This port is configured for operation at 9600 baud and uses a standard Xon/Xoff handshaking protocol. The associated RJ-45 type connector is located on the 35360A TRACKER Display's rear panel.

  • Page 33: Model 35300A Ion Chamber Detectors

    The ion chamber calibration factors (ICCF's) supplied by Fluke Biomedical expresses this sensitivity in terms of R/nC. These ICCF's are specified for a temperature of 22 °C and a pressure of 760 millimeters of mercury (mm Hg). Since the 90100 TRACKER System may be used under ambient conditions which significantly differ from these, the corresponding changes in the sensitivity of the ion chamber must be accounted for.

  • Page 34: Basic Operating Equations

    Model 90100 Operators Manual Pressure Temperature mm Hg = inch Hg ∗ 25.4 K = (5/9) ∗ (°F -32) - 273.15 mm Hg = 760 ∗ (54,041 - feet ASL) / (54,041 + feet ASL) K = °C + 273.15 mm Hg = 760 ∗...

  • Page 35: Basic Operating Quantities

    Theory of Operation Basic Operating Quantities 3.6 Basic Operating Quantities Table 3-3. Basic Operation Quantities Quantity Description Units Comments Electrical current delivered to readout in Current nC/Min response to radiation incident upon detector. Electrical charge delivered to readout in Charge response to radiation incident upon detector.
  • Page 36 Model 90100 Operators Manual (Blank page)

  • Page 37: Introduction

    Maintenance & Service Introduction Section 4 Maintenance & Service WARNING The Model 35360A TRACKER Display and 35300A Detector contain no internal operator serviceable parts. Disassembly of either unit could result in electrical shock. Always turn the 35360A TRACKER Display's power off prior to connecting or disconnecting the interface cable.

  • Page 38: Troubleshooting

    Model 90100 Operators Manual 4.2 Troubleshooting This system contains a number of troubleshooting procedures that may be executed by the user in the field. Each procedure is illustrated in the form of a flow chart and is directed toward resolving the specific symptom listed in the first block of the chart.
  • Page 39 Maintenance & Service Troubleshooting 35360A TRACKER Display will not turn on (display will not light) NOTE 35360A TRACKER Display's VFD does not illuminate when POWER key is pressed. When attempting to turn the instrument on, firmly press the POWER key and hold for approximately one second.
  • Page 40 Model 90100 Operators Manual Low Battery Indication at the Display Low Battery annuciator is displayed on 35360A TRACKER Display's VFD. WARNING The Model 35360A TRACKER Display and 35300A Detector contain no internal operator serviceable Disassembly of either unit could result in electrical Always turn the 35360A TRACKER Display's power off prior to connecting or disconnecting the interface Operating from...
  • Page 41 Maintenance & Service Troubleshooting Bias Error (LoBias or HiBias) Indication at the Display WARNING Bias error annuciator is displayed on 35360A TRACKER Display's VFD. The Model 35360A TRACKER Display and 35300A Detector contain no internal operator serviceable parts. Disassembly of either unit could result in electrical shock. Always turn the 35360A TRACKER Display's power off prior to connecting or disconnecting the interface cable.
  • Page 42 Model 90100 Operators Manual Dose Measurement Value Drifts Prior to (or following) the Exposure One or more dose measurement values WARNING exhibits a drift rate of greater than two counts per minute in the absence of The Model 35360A TRACKER Display and 35300A radiation.

  • Page 43: Line Fuse Replacement

    Maintenance & Service Troubleshooting Dose Rate Measurement Value Does Not Return to Zero in the Absence of a Radiation Beam WARNING One or more dose rate measurement values do not return to within one The Model 35360A TRACKER Display and 35300A Detector contain no internal operator serviceable parts.
  • Page 44 Model 90100 Operators Manual 1. Position the instrument on its display face. Model 35360A TRACKER Display COMPUTER INTERFACE RS-232 Rear Panel 100-240V 50/60 Hz 50VA DETECTOR INPUT Fuses Fuse Drawer Fuse Drawer Figure 4-6. Model 35360A TRACKER Display Fuse Replacement 2.

  • Page 45: Interface Connector Cleaning

    They are intended for use in cleaning fine and delicate camera equipment. If this cleaning method fails to produce satisfactory results, then service by Fluke Biomedical will be required. A procedure for troubleshooting excessive leakage is given earlier in this section.

  • Page 46: Recalibration & Repair Information/Technical Assistance

    018-304 4.7 Recalibration & Repair Information / Technical Assistance If your instrument needs recalibration or repair, we request that you consult Fluke Biomedical at 440.498.2564, or Fax 440.542.3682. More information concerning the operation, application, or service of your instrument may be obtained from the applications engineer at the previously listed numbers.

  • Page 47: Section 5: Customization

    Customization Introduction Section 5 Customization 5.1 Introduction From the factory, the Model 35360A TRACKER Display arrives with valid settings allowing you to make measurements immediately. Should the need arise to change or modify any of the Items described below, the Customization software provides a friendly environment for customizing the 35360A TRACKER Display to meet your needs.

  • Page 48: Make A Working Disk

    Model 90100 Operators Manual 5.2 Make a Working Disk Before using the Customization software, we recommend that a working disk be made. To make a working disk, simply copy all of the files from the disk to a blank, formatted disk. Store the original in a safe place.
  • Page 49 Customization Screen Formats 35360A TRACKER Display Customization TRACKER Display √ Power Down S/N: Temperature 00001 FW Rev: 13AUG92 U it Pressure millimeters h it U it Optional H *OPTIONAL TEXT LINE* Date M D etector Serial 12345 4 Sep Ion Chamber Cal R/nC U it Display Units...
  • Page 50 Model 90100 Operators Manual At the bottom of both screens, the Customization software displays the active keys and a short definition for each key. On the Display Customization screen, the serial number of the 35360A TRACKER Display, the firmware's version, and the current date appear. The date of the last calibration appears in the bottom box. This date changes to the current date if you make a change to any item.

  • Page 51: Definitions

    Customization Definitions 5.6 Definitions This section describes all of the Items that may be customized with the Customization software. It is split into two sections matching the two screens. CUSTOMIZATION ITEMS Power Down Interval The power down interval is used to specify the number of minutes the 35360A TRACKER Display remains powered during periods of inactivity.

  • Page 52: Setting The Electrometer Gains And Offsets

    Model 90100 Operators Manual The 35360A TRACKER Display supports four units of radiation. To convert between these units, use Table 5-1. This table was developed from accepted definitions of radiation units. While Table 5-1 shows sieverts and grays as equivalent, we acknowledge that other factors may contribute to this conversion. Additionally, the instrument allows you to display readings in monitor units.
  • Page 53 Customization Setting the Electrometer Gains and Offsets ELECTROMETER OFFSET (ADZ) The procedure for setting the electrometer offsets for current and charge is the same. For every electrometer channel, repeat this procedure once. Turn the instrument off and disconnect the interface cable if it is connected.

  • Page 54: Usage Examples

    Model 90100 Operators Manual where Measurement is the value on the 35360A TRACKER Display, and ICCF and DUCF are defined on page 60 and page 59 respectively. Enter the value calculated in Step 2 into the Display Calibration Items screen of the Customization software.
  • Page 55 Customization Usage Examples CHANGING THE ION CHAMBER CALIBRATION FACTOR UNITS CAUTION This example changes the current value of a factory-set calibration factor. Make a note of the value BEFORE changing it so that it may be set to this value at the end of the example. 1.

  • Page 56: Errors

    Model 90100 Operators Manual 5.9 Errors During program operations, errors may appear. The error messages are grouped into input errors, a hardware error, and communication errors. INPUT ERRORS Input errors may appear while changing Item values. When these errors occur, press any key to clear the error and enter a different value.

  • Page 57: Appendix A: Using Build-Up

    Appendix Using Build-Up Appendix A Using Build-Up A.1 Build-Up, Peg, and Retainer Kit Options If you want to use build-up to simulate tissue, you can put plates of either "solid water" or acrylic (optional accessories) securely on one or both sides of the Model 35300A Detector. Build-up pegs and retainer rings for securing the acrylic plates to the 35300A Detector are also available as optional accessories (see Figure A-1).
  • Page 58 Model 90100 Operators Manual Recommended build-up for photons is given in Table A-1; recommended build-up for electrons is given in Table A-2. Table A-2 takes into account the 0.56 cm water-equivalent inherent in the 35300A Detector. Cobalt-60 radiation does not require any added build-up. Table A-1.
  • Page 59 Appendix Using Build-Up Table A-2. Recommended Amount of Build-up to Use With the Model 35300A Detector to Attain Electrons d max for Linear Accelerators. 37051C-1 Plates are 0.44 cm Each Nominal Number of build-up "Solid Water" Accelerator Potential, plates thickness (cm) (37051C-1) The amount of underside build-up to be used depends on how closely you wish to approximate the back- scattering of a water bath or other test set-up.
  • Page 60 Fluke Biomedical Radiation Management Services 6045 Cochran Road Cleveland, Ohio 44139 440.498.2564 www.flukebiomedical.com/rms...

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