Podcast
Questions and Answers
Which part is primarily responsible for detecting radiation in the Model 44-9?
Which part is primarily responsible for detecting radiation in the Model 44-9?
- PROTECTIVE SCREEN
- SNAP-IN FRONT COVER
- HANDLE GRIP
- GM TUBE (correct)
Which component serves as the grip for handling the detector?
Which component serves as the grip for handling the detector?
- PENCIL CLIP
- HANDLE GRIP (correct)
- GM TUBE
- DETECTOR BODY
What type of detector is the Ludlum Model 44-9 classified as?
What type of detector is the Ludlum Model 44-9 classified as?
- Alpha and X-ray detector
- Alpha, Beta, and Gamma detector (correct)
- Radiation shielding device
- Thermal imaging camera
What is the primary function of the Ludlum Model 44-9 GM Detector?
What is the primary function of the Ludlum Model 44-9 GM Detector?
What is the recommended operating voltage for the Ludlum Model 44-9 Detector?
What is the recommended operating voltage for the Ludlum Model 44-9 Detector?
What is the consequence of using an instrument input sensitivity lower than 30 mV?
What is the consequence of using an instrument input sensitivity lower than 30 mV?
What type of window does the Ludlum Model 44-9 Detector have?
What type of window does the Ludlum Model 44-9 Detector have?
What additional feature does the pancake shape of the Ludlum Model 44-9 provide?
What additional feature does the pancake shape of the Ludlum Model 44-9 provide?
How does the Ludlum Model 44-9 Detector respond in the 60 keV to 100 keV energy range?
How does the Ludlum Model 44-9 Detector respond in the 60 keV to 100 keV energy range?
What is the typical efficiency of the Model 44-9 detector for detecting 90Sr/90Y isotopes?
What is the typical efficiency of the Model 44-9 detector for detecting 90Sr/90Y isotopes?
What is the window area of the Model 44-9 detector classified as active?
What is the window area of the Model 44-9 detector classified as active?
What is the dead time specification for the Model 44-9 detector?
What is the dead time specification for the Model 44-9 detector?
At what operating voltage does the Model 44-9 detector function?
At what operating voltage does the Model 44-9 detector function?
What is the typical sensitivity of the Model 44-9 detector in terms of cpm per mR/hr?
What is the typical sensitivity of the Model 44-9 detector in terms of cpm per mR/hr?
What is the proper high voltage setting for the detector?
What is the proper high voltage setting for the detector?
What is the typical background reading for the detector when connected to the instrument?
What is the typical background reading for the detector when connected to the instrument?
What should be verified after exposing the detector to a check source?
What should be verified after exposing the detector to a check source?
What precaution should be taken when cleaning the detector?
What precaution should be taken when cleaning the detector?
What should you avoid doing with the mica window of the tube?
What should you avoid doing with the mica window of the tube?
What is a sign that the detector may be malfunctioning?
What is a sign that the detector may be malfunctioning?
Flashcards
Ludlum Model 44-9 function
Ludlum Model 44-9 function
Identifies alpha, beta, and gamma radiation.
Ludlum Model 44-9 shape
Ludlum Model 44-9 shape
Pancake-shaped for easy surveying and monitoring.
Operating voltage range
Operating voltage range
850-1000 volts (900 Vdc recommended).
Warranty duration
Warranty duration
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Calibration guarantee
Calibration guarantee
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Non-replaceable parts
Non-replaceable parts
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Return requirements
Return requirements
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14C efficiency
14C efficiency
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90Sr/90Y efficiency
90Sr/90Y efficiency
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99Tc efficiency
99Tc efficiency
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Sensitivity (137Cs gamma)
Sensitivity (137Cs gamma)
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Active window area
Active window area
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Mica window thickness
Mica window thickness
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Background reading (typical)
Background reading (typical)
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Dead time
Dead time
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GM tube replacement
GM tube replacement
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Cleaning method
Cleaning method
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Instrument connection procedure
Instrument connection procedure
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Background reading check
Background reading check
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Calibration verification
Calibration verification
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Study Notes
Overview of Ludlum Model 44-9
- The Ludlum Model 44-9 is a GM (Geiger-Mueller) Detector designed to identify alpha, beta, and gamma radiation.
- Known for its pancake shape, making it user-friendly for surveying and personnel monitoring.
- Operates within a voltage range of 850-1000 volts, with a recommended voltage of approximately 900 Vdc.
Warranty and Repairs
- Covered by a 12-month warranty against defects in workmanship, materials, and design.
- Calibration is guaranteed within specified accuracy limits at the time of shipment.
- Exclusions: replacement of photomultiplier tubes, G-M tubes, proportional tubes, and scintillation crystals damaged due to misuse.
- For returns, include necessary information and a completed Instrument Return Form.
Specifications
- Efficiency varies: approximately 5% for 14C, 22% for 90Sr/90Y, 19% for 99Tc, and more.
- Typical sensitivity is 3300 cpm per mR/h for 137Cs gamma radiation.
- Active window area is 15.51 cm² with a mica window thickness of 1.7 ± 0.3 mg/cm².
- Background reading is typically 60 cpm with a dead time around 80 µs.
Operating Procedures
- To connect, securely attach the cable from the detector to the measurement instrument.
- Proper background reading should be checked after connection, aiming for 25-50 cpm at 8-15 µR/h.
- Ensure detector's reading matches within 20% of the check source after calibration.
- Instrumental failures may necessitate further inspection or maintenance.
Tube Replacement
- Instructions include removing the back plate, loosening set screws, and carefully replacing the GM tube.
- The mica window is delicate; touching may lead to malfunction, requiring extra caution.
- Recalibrate the instrument after replacing the tube to ensure accurate functionality.
Cleaning Instructions
- Clean the detector externally with a damp cloth using only water; immersion is not allowed.
- Turn off instrument electronics prior to cleaning and disconnect cables.
Parts List
- Complete assembly is referenced under part number 47-1539.
- Parts include: Detector Body (2002-109), GM Tube (01-5008), and various screws and connectors.
Additional Features
- Enhanced efficiency and energy response influenced by detector design.
- Detector weight is approximately 0.5 kg, and it operates in temperatures ranging from -15 to 50 °C, with certification possible for broader ranges.
- Caution advised during air transport due to potential altitude effects on GM tube integrity.
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Description
This quiz focuses on the Ludlum Model 44-9 Alpha, Beta, and Gamma Detector. It includes information on its features, specifications, and warranty details as of January 2018. Test your knowledge on the functionalities of this radiation detection equipment.
