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Summary of Contents for Ludlum Measurements 42-31H
- Page 1 LUDLUM MODEL 42-31H NEUTRON DETECTOR October 2011...
- Page 2 LUDLUM MODEL 42-31H NEUTRON DETECTOR October 2011...
- Page 3 RETURN OF GOODS TO MANUFACTURER If equipment needs to be returned to Ludlum Measurements, Inc. for repair or calibration, please send to the address below. All shipments should include documentation containing return shipping address, customer name, telephone number, description of service requested, and all other necessary information.
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Page 4: Table Of Contents
Model 42-31H 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 Gamma Rejection Check Conversion Chart Parts List... -
Page 5: Introduction
He→ H + 0.764 MeV. The Ludlum Model 42-31H utilizes this reaction in the form of helium- He), which fills the gas proportional tube of the detector The Model 42-31H is designed to be used with portable counting instruments and has a top bracket that allows for convenient mounting of a portable instrument. - Page 6 Model 42-31H 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. Page 1-2 October 2011...
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Page 7: Unpacking And Repacking
Model 42-31H Neutron Detector Technical Manual Section 2 Section Unpacking and Repacking Remove the calibration certificate or detector functional check certificate and place it in a secure location. Remove the detector(s) and accessories (if applicable) and ensure that all items listed on the packing list are in the carton. -
Page 8: Specifications
Model 42-31H Neutron Detector Technical Manual Section 3 Section Specifications 2 atm ³He tube LND 25185 or equivalent Detector: 22.9 cm (9 in.) diameter cadmium-loaded polyethylene sphere Moderator: typically used with portable counting Compatible Instruments: instruments (capable of achieving -2 mV input sensitivity) -
Page 9: Safety Considerations
Model 42-31H 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 10: Calibration
Calibration Calibration To calibrate the detector, the following items are needed: • Counting instrument: Ludlum Model 2200 Scaler/Ratemeter • AmBe neutron source (Note that the Model 42-31H is energy-dependent.) • Cs gamma source for gamma rejection check Operating Voltage Plateau Connect the Model 42-31H to a Model 2200. -
Page 11: Gamma Rejection Check
This value should be approximately 120 cpm/mrem/hr. Gamma Rejection Check With the Model 42-31H connected to the Model 2200, adjust the Model 2200 HV to the assumed operating voltage determined above. Remove the Model 42-31H detector from the moderator and place in a 10 R/hr Cs gamma radiation field. -
Page 12: Conversion Chart
Model 42-31H 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 13: Parts List
Model 42-31H Neutron Detector Technical Manual Section 6 Section Parts List Reference Description Part Number Model 42-31H UNIT Completely Assembled Neutron Detector Model 42-31H Neutron Detector 47-3583 Model 42-31H SPHERE ASSY 47-1345 FOOT BRACKET 7005-084 9-inch BALL 7002-097 MOUNTING RING...
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