Fluke 90-12 User Manual
Victoreen® 90-12
Energy Compensated GM Probe
February 2005
Manual No. 90-12-1 Rev. 3
©2004, 2005 Fluke Corporation, All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies
Users Manual
Fluke Biomedical
Radiation Management Services
6045 Cochran Road
Cleveland, Ohio 44139
440.498.2564
120 Andrews Road
Hicksville, New York 11801
516.870.0100
www.flukebiomedical.com/rms
Table of Contents
Section 1: Introduction................................................................................................ 1-1
1.1 Product Description ..................................................................................... 1-1
1.2 Specifications............................................................................................... 1-1
1.3 Connecting Cables ...................................................................................... 1-2
1.4 Survey Meter Compatibility and Range Guide ............................................. 1-2
1.5 Photon Energy Response............................................................................ 1-2
1.6 Beta Sensitivity, Slide Open......................................................................... 1-3
1.7 Beta Shield Response ................................................................................. 1-3
1.8 Receiving Inspection.................................................................................... 1-4
1.9 Storage ........................................................................................................ 1-4
1.10 Procedures, Warnings, and Cautions .......................................................... 1-4
Section 2: Operation.................................................................................................... 2-1
2.1 General ........................................................................................................ 2-1
2.2 Compatibility ................................................................................................ 2-1
2.3 Initial Connection ......................................................................................... 2-1
2.4 Use in Adverse Conditions........................................................................... 2-2
2.5 The Beta Shield ........................................................................................... 2-2
2.6 The Open Windows ..................................................................................... 2-2
2.7 Error Analysis .............................................................................................. 2-2
2.8 Minimum Detectability.................................................................................. 2-2
Section 3: Theory of Operation................................................................................... 3-1
3.1 General ........................................................................................................ 3-1
3.2 Circuit Description........................................................................................ 3-2
Section 4: Calibration, Maintenance, and Troubleshooting..................................... 4-1
4.1 Calibration.................................................................................................... 4-1
4.1.1 Precautions ............................................................................................ 4-1
4.1.2 Standards ............................................................................................... 4-1
4.1.3 Factory Calibration Points ...................................................................... 4-1
4.2 Preventive Maintenance .............................................................................. 4-1
4.3 Corrective Maintenance/Troubleshooting .................................................... 4-1
4.3.1 Precautions ............................................................................................ 4-2
4.3.2 Disassembly ........................................................................................... 4-2
4.3.3 Reassembly............................................................................................ 4-2
4.4 Replacement Parts ...................................................................................... 4-2
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Introduction
Product Description
1
Section 1
Introduction
1.1 Product Description
The 90-12 is a rugged, lightweight, energy compensated, general purpose Geiger Mueller (GM) tube
based hand held probe, with beta shields. These probes are designed to fulfill a variety of radiation
measurement needs. The adjustable beta shield is a 360-degree shield with a linear movement to permit
discrimination between penetrating and non-penetrating radiation. The two windows expose an angle of
180 degrees total in the most sensitive area of the GM tube. With the shield open the probes measure
beta, x-rays, and gamma rays. With the beta shield closed the probes measure penetrating x-rays and
gamma rays. The GM probes are available with MHV or BNC connectors. A coiled coaxial cable style is
available to connect these probes to a wide variety of Victoreen survey meters. Refer to Figure 1-1 for a
general view.
The energy compensation feature permits accurate exposure rate measurements from background to the
maximum range.
1.2 Specifications
Operating Voltage 900 V
Plateau length 100 V (min)
Plateau Slope 0.1 %/V (max)
Temperature Range -40°F to +167°F (-40°C to +75°C)
Relative Humidity 0-95% non-condensing
2
Wall Thickness 30 mg/cm
Wall Material Stainless Steel
Maximum Background 15 CPM
Gamma Sensitivity 700 CPM/mR/hr*
* Calibrated to
Energy Response See curve
Housing ABS plastic
Beta Shield Density 1890 mg/cm
Connector MHV
137
Cs
(tube)
2
Size 1.38 in ∅ x 6.7 in (l) (3.5 x 17 cm)
Weight 0.58 lb (0.26 kg)
1-1
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