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Questions and Answers
What must be verified when exposing the detector to a check source?
Which of the following conditions is NOT suitable for the normal use of the instrument?
What is a necessary precaution before cleaning the detector?
If an instrument does not meet the verification criteria, what may this indicate?
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What is the maximum relative humidity allowed for the normal use of the instrument?
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What is the maximum operating voltage recommended for most models of the Model 133 Series Gamma Detector?
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Which model of the Model 133 Series Gamma Detector has the highest sensitivity to radiation?
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What is the typical dead time for the Model 133 Series Gamma Detector?
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What background count rate is specified for Model 133-4?
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What is the resistance value of the resistor used in the Model 133-3 Gamma Detector?
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Which temperature range is suitable for operating the Model 133 Series Gamma Detector?
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What connector type is standard for the Model 133 Series Gamma Detector?
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What is true about the energy response range for Model 133-7?
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Why might the gamma detector not function properly?
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Study Notes
Model 133 Gamma Detector Overview
- The Model 133 series includes multiple gamma detector models: 133-2, 133-3, 133-4, 133-6, and 133-7.
- Waterproof models are designated with “-1” suffix, containing an O-ring and hard-wired 30-meter cable.
Specifications and Performance
- Recommended operating voltage for most models: 550 Vdc, except for the Model 133-7 at 460 Vdc.
- Energy response accuracy is within 25% for the range of 60 keV to 3 MeV.
- Sensitivity levels vary:
- 133-2 at 1000 cpm/mR/hr
- 133-3 at 450 cpm/mR/hr
- 133-4 at 100 cpm/mR/hr
- 133-6 at 18 cpm/mR/hr
- 133-7 at 4.2 cpm/mR/hr
- Background count rates range from 1 to 12 cpm across different models.
Components and Assemblies
- Each model includes specific components such as GM tubes, resistor boards, bodies for screws, connector caps, and O-rings.
- Common parts utilized include:
- GM TUBE types: LND 71210, LND 71412, LND 71616, and CSF 3G70.
- Resistor values generally at 3.3 MEG or 4.7 MEG depending on the model.
- Assembly is delivered fully complete without consumable materials.
Environmental and Operational Instructions
- Suitable for use in dry environments indoors or outdoors, with a temperature range from -20 to 50 °C (-4 to 122 °F).
- Can withstand maximum humidity of less than 95%.
- Standard cleaning involves using a damp cloth with water; immersion in liquid is prohibited.
Connection and Testing Procedures
- To connect, securely attach the cable connectors by twisting clockwise until latched.
- Before usage, check high voltage settings and ensure a proper background reading is achieved.
- Tests should validate detector’s response within 20% of calibration readings.
Safety and Maintenance
- Adhere to packing instructions for returning instruments, including using appropriate materials to prevent damage.
- Ensure calibration certificates are retained and match serial numbers for proper tracking.
Parts List
- Key part numbers include:
- Shrink tubing: 22-9501 for 1/16 inch black and 22-9540 for 3/32 inch clear.
- Connector Series “C”: part number 4478-011.
- O-rings: “2-016 BUNA 70” (16-8364) and “2-018” (16-8307).
- Ensure all components align with the respective model specifications.
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Description
Test your knowledge on the components and specifications of the Model 133 Gamma Detector and its various parts. This quiz covers details about connectors, resistors, and GM tubes associated with the detector. Perfect for students and professionals in radiation detection technology.
