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LUDLUM MODEL 42-31H

NEUTRON DETECTOR

October 2011

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Summary of Contents for 42-31H

Page 1: ...LUDLUM MODEL 42 31H NEUTRON DETECTOR October 2011 ...

Page 2: ...LUDLUM MODEL 42 31H NEUTRON DETECTOR October 2011 ...

Page 3: ...anty of merchantability or fitness which extend beyond the description of the face there of If the product does not perform as warranted herein purchaser s sole remedy shall be repair or replacement at the option of Ludlum Measurements In no event will Ludlum Measurements be liable for damages lost revenue lost wages or any other incidental or consequential damages arising from the purchase use or...

Page 4: ... and Repacking 2 Connecting to an Instrument 2 1 Specifications 3 Safety Considerations 4 Environmental Conditions for Normal Use 4 1 Cleaning Instructions and Precautions 4 1 Calibration 5 Calibration 5 1 Operating Voltage 5 1 Gamma Rejection Check 5 2 Conversion Chart 5 3 Parts List 6 ...

Page 5: ...ction process A common reaction for the conversion of slow neutrons into directly detectable particles is n 3 He 3 H 1 H 0 764 MeV The Ludlum Model 42 31H utilizes this reaction in the form of helium 3 3 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 p...

Page 6: ...alManual Section1 Ludlum Measurements Inc Page 1 2 October 2011 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 7: ...calibration provide sufficient packing material to prevent damage during shipment and affix appropriate warning labels to promote careful handling The following items and information should also be included to insure quick turnaround time of your equipment instrument s and related cable s brief description as to the reason for return description of service requested return shipping address custome...

Page 8: ... 2 mV input sensitivity Sensitivity 100 cpm mrem hr 241 AmBe fast neutrons Gamma Rejection 10 cpm or less through 10 R hr 100 mSv hr 137 Cs Detection Range thermal to approximately 12 MeV Energy Response thermal to 12 MeV follows the radiation protection guide curve for neutron dose Input Sensitivity 2 mV Operating Voltage approximately 1200 V Connector series C others available Temperature Range ...

Page 9: ...less than 95 non condensing Pollution Degree 2 as defined by IEC 664 Normally only nonconductive pollution occurs Temporary conductivity caused by condensation is to be expected Cleaning Instructions and Precautions The detector may be cleaned externally with a damp cloth using only water as the wetting agent Do not immerse the instrument in any liquid Observe the following precautions when cleani...

Page 10: ...tector to a 20 mrem hr 241 AmBe neutron source Run a plateau as follows Taking one minute counts record the count rate for 25 volt incremental steps from 1000 volts through a region in which the count rate steadily increases becomes relatively constant flattens out and then increases again A typical range will be 1000 1250 volts The flattest portion of this region is the desired plateau The value ...

Page 11: ...y 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 137 Cs gamma radiation field Take a one minute count If more than 10 counts are observed for the one minute period decrease the operating voltage until the coun...

Page 12: ...0 mrem hr Take a one minute count and record the value including the range scale setting of counting instrument Repeat for the dose equivalent rates shown in Table 1 The values in Table 1 and their corresponding measured values represent a conversion chart for use in relating other measured values to actual dose equivalent rates Table 1 Ref Point mrem hr Reading cpm Range Scale 400 200 80 20 8 2 ...

Page 13: ...RE ASSY 47 1345 FOOT BRACKET 7005 084 9 inch BALL 7002 097 MOUNTING RING 7005 101 RIGHT HANDED INST MOUNTING BRACKET 7363 246 LEFT HANDED INST MOUNTING BRACKET 7363 247 MODEL 42 31H PROBE ASSY 4005 140 3 CONNECTOR UG706 U 4478 011 He TUBE 25185 2 ATM 01 5793 TUBE BODY ASSY 2005 092 MODEL 42 30 42 31 DETECTOR SPACER 7005 056 CONNECTOR END 7005 095 CBL Model 42 30 6 inch R6178 8303 856 Section 6 Mod...

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