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Summary of Contents for LUDLUM 42-49
- Page 1 LUDLUM MODEL 42-49 NEUTRON DETECTOR December 2017...
- Page 2 LUDLUM MODEL 42-49 NEUTRON DETECTOR December 2017...
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Page 3: Table Of Contents
Model 42-49 Neutron Detector Technical Manual Table of Contents Introduction Unpacking and Repacking Connecting to an Instrument Specifications Safety Considerations Environmental Conditions for Normal Use Cleaning Instructions and Precautions Calibration Calibration Operating Voltage Plateau Gamma Rejection Check Conversion Chart Parts List... -
Page 4: Introduction
He→ H + 0.764 MeV. The Ludlum Model 42-49 utilizes this reaction in the form of helium-3( He), which fills the gas proportional tube of the detector The Model 42-49 is designed to be used with portable counting instruments and has a top bracket that allows for convenient mounting of a portable instrument. - Page 5 Model 42-49 Neutron Detector Technical Manual Section 1 Note: The detector does not contain any consumable materials. Note: If the detector is used in a manner not intended by the manufacturer, the detector may not function properly. Ludlum Measurements, Inc.
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Page 6: Unpacking And Repacking
Every returned instrument must be accompanied by an Instrument Return Form, which can be downloaded from the Ludlum website at www.ludlums.com. Find the form by clicking on the “Support” tab and selecting “Repair and Calibration” from the drop-down menu. -
Page 7: Specifications
Model 42-49 Neutron Detector Technical Manual Section 3 Section Specifications 2 atm ³He tube LND 25185 or equivalent Detector: 19.6 cm (7.7 in.) diameter high density polyethylene sphere Moderator: typically used with portable counting Compatible Instruments: instruments (capable of achieving -2 mV input sensitivity) -
Page 8: Safety Considerations
Model 42-49 Neutron Detector Technical Manual Section 4 Section Safety Considerations Environmental Conditions for Normal Use Indoor or outdoor use (in a dry environment) No maximum altitude Temperature range of -20 to 50 °C (-4 to 122 °F); may be certified for operation at -40 to 65.6 °C (-40 to 150 °F) -
Page 9: Calibration
AmBe neutron source or equivalent Cs gamma source for gamma rejection check Operating Voltage Plateau Connect the Model 42-49 to a Model 2200. Set Model 2200 input sensitivity to -2 mV. Expose the detector to a 20 mrem/hr AmBe neutron source. -
Page 10: Gamma Rejection Check
This value should be approximately 120 cpm/mrem/hr. Gamma Rejection Check With the Model 42-49 connected to the Model 2200, adjust the Model 2200 HV to the assumed operating voltage determined above. Remove the Model 42-49 detector from the moderator and place in a 10 R/hr Cs gamma radiation field. -
Page 11: Conversion Chart
Model 42-49 Neutron Detector Technical Manual Section 5 Conversion Chart Expose the detector to an AmBe neutron source at a dose- equivalent rate of 400 mrem/hr. Take a one-minute count and record the value, including the range/scale setting of counting instrument. -
Page 12: Parts List
7005-060 7.7 inch SPHERE 7014-858 2 EA. INSERT E-Z LOK 6-32 20-9066 8 EA. 8 INCH HDPE ROD 29-9985 MODEL 42-49 DET + MODERATOR 47-4059 1 EA. O RING-2-116 16-8293 1 EA. O RING-2-148 16-8340 2 EA. SCREW-8-32 X 5/8 SOC SET...
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