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Model 182 Radon Flask Counter

Ludlum Measurements, Inc.

Page 8

June 2011

Excessive Background Count On Plateau

A. Expected Background Count

3 counts per 10 minutes or less with

scintillation material

B. Excessive: Light leak

Cable malfunction

Microswitch malfunction

PMT noisy

Instrument contaminated

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Summary of Contents for 182

Page 1: ...LUDLUM MODEL 182 RADON FLASK COUNTER June 2011 Serial Number PR206794 and Succeeding Serial Numbers ...

Page 2: ...UDLUM MODEL 182 RADON FLASK COUNTER June 2011 Serial Number PR206794 and Succeeding Serial Numbers LUDLUM MEASUREMENTS INC 501 OAK STREET P O BOX 810 SWEETWATER TEXAS 79556 325 235 5494 FAX 325 235 4672 ...

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: ...ask Counter Ludlum Measurements Inc December 2007 Table of Contents Introduction 1 Operation 1 Specifications 2 Safety Considerations 3 Recycling 4 Calibration and Maintenance 5 Troubleshooting 7 Parts List 9 Drawings 10 ...

Page 5: ...Model 182 Radon Flask Counter Ludlum Measurements Inc June 2011 Model 182 Radon Flask Counter open ...

Page 6: ...lly activates a microswitch allowing high voltage to be applied to the PMT When the upper tube assembly is removed the HV is automatically disconnected This allows the cover to be removed without turning off the high voltage on the accompanying scaler count rate meter type instrument The Model 182 Switch Shield Connector Box is constructed for a Series C connector The Series C connector uses a one...

Page 7: ...utes of dark adaptation may be required after scintillation material is exposed to direct room light Specifications Photomultiplier Tube PMT 5 1 cm 2 in diameter 14 pin 10 stage dynode string Operating Range 400 1250 V Maximum PMT Voltage 1500 V Connector standard Series C Dark Adaptation function of scintillation material ranges from 20 minutes to 48 hours Maximum Sample Size 6 1 x 12 7 cm 2 4 x ...

Page 8: ...ined by IEC 664 Caution The operator or responsible body is cautioned that the protection provided by the equipment may be impaired if the equipment is used in a manner not specified by Ludlum Measurements Inc CLEANING AND MAINTENANCE PRECAUTIONS The Model 182 may be cleaned externally with a damp cloth using only water as the wetting agent Do not immerse the detector in any liquid Observe the fol...

Page 9: ...ifferent agencies public and private involved in this pursuit it becomes evident that a myriad of methods can be used in the process of recycling Therefore Ludlum Measurements Inc does not suggest one particular method over another but simply desires to inform its consumers of the range of recyclable materials present in its products so that the user will have flexibility in following all local an...

Page 10: ...iplier tube The lip on the top cover should bottom out in the groove of the lower tube ensuring the lid sits securely With no source or scintillator material check the instrument from 500 volts to 1500 volts in 100 volt increments to determine the background count Place the scintillation flask or scintillation material being used onto the light pipe Plateau the instrument from 500 volts in 100 vol...

Page 11: ... in the instrument Use the same type of source as the material to be measured with similar geometry to the material to be measured if possible Divide the sample count by the calibrated source size in disintegrations per minute DPM Multiply by 100 to obtain efficiency 4π Document using the appropriate forms MAINTENANCE The surface of the acrylic light pipe is vulnerable to mars and scratches requir...

Page 12: ...ral steps are given perform them in order until the problem is corrected We hope these tips will prove to be helpful As always please call if you encounter difficulty in resolving a problem or if you have any questions Symptom Possible Cause Zero counts Model 182 not connected to counting instrument HV push rod not properly adjusted Cable malfunction Broken HV of signal wire PMT Tube socket malfun...

Page 13: ...ts Inc Page 8 June 2011 Excessive Background Count On Plateau A Expected Background Count 3 counts per 10 minutes or less with scintillation material B Excessive Light leak Cable malfunction Microswitch malfunction PMT noisy Instrument contaminated ...

Page 14: ...538 Microswitch 1 18 8779 Terminal Strip 4 Pin 1 10 7028 1 Megohm W Resistor 3 21 9353 Signal Coax RG178 U 10 in 22 9570 HV Wire 8869 10 in 17 8757 Brass Thumbscrews 6 32 x 2 04 5518 0015µF 3kV Capacitor 1 7186 026 Switch Rod Guide 1 7090 007 01 Switch Rod 1 7090 007 02 Switch Rod Cap 1 7090 006 01 Switch Shield 1 13 7752 Series C Connector 1 7090 007 08 Ear Tube Lock 1 2090 008 06 Upper Tube Asse...

Page 15: ...Model 182 Radon Flask Counter Ludlum Measurements Inc Page 10 June 2011 Drawings Model 182 Assembly View Drawing 90 x 16 Model 182 2 inch Socket Drawing 2 x 180 ...

Page 16: ...Model 182 Radon Flask Counter Ludlum Measurements Inc Page 11 June 2011 ...

Page 17: ...Model 182 Radon Flask Counter Ludlum Measurements Inc Page 12 June 2011 ...

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