ML19224A998

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Station Chemistry Procedure 1958.2,Revision 1:instrument Operation of Hewlett-Packard multi-channel Analyzer
ML19224A998
Person / Time
Site: Crane Constellation icon.png
Issue date: 10/29/1977
From:
Metropolitan Edison Co
To: Mullinix W
NRC/IE
References
1958.2, TM-0199, TM-199, NUDOCS 7906130399
Download: ML19224A998 (9)
v • d • e


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Revision 1 10/29/77 THREE MILE ISLAND NUCLE AR STATION MASTER COPY STATION CHEMISTRY PROCECURE 1958.2 f

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Revision 1 10/29/77 THREE MILE ISLAND NUCLEAR STATION STATION CHEMISTRY PROCEDURE 1958.2 INSTRUMENT OPERATION OF HEWLETT PACKARD MCA 1.0

SUMMARY

e This procedure describes the normal operation of the Hewlett-

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Packard multi-channel analyzer (MCA).

The MCA system is used to qualitatively and quantitatively measure the gamma radiation emitted by a sample.

A germanium lithium (Geli) scintillation crystal is used for converting the gamma radiation to electrical pulses for use by the MCA.

The analyzer then accumulates these pulses of various energies and converts them to a binary code.

Interpretation of the data is accomplished by transferring the binary code to a small ccmputer which, with the aid of the Cran Program, will calculate and print out the activity found in a sample.

2.0 APPARATUS 2.1 Hewlett Packard Multi-Channel Analyzer 2.2 Geli Cetector 2.3 Calculator / Mini-Computer 2.4 X-Y Plotter 2.5 Lead Shield for Detector 2.6 Calibration Sources 3.0 REAGENTS None

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4.0 PROCEDURE 4.1 Place switches of the '4CA as per Acpendix A 180 360 1.0 E

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1958.2 Revision 1 10/29/77 4.2 Energy Calibration 4.2.1 Insure the " input offset volts" switch is set to the Var

-1 to +1 position and the " input offset volts" pot is set to approximately 5.00.

137 60 f

4.2.2 91 ace a CS

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4.2.3 Erase MCA by switching the " Function" switch to Erase position and press Start button.

4.2.4 Set " Timing Control" to accumulate for 20 minutes.

(Ref.

Appendix A).

4.2.5 Place " Function" switch in Accumulate and press Start button.

4.2.6 Display the accumulated spectrum on the scope by turning

" Function" switch to Disolay and press Start.

4.2.7 Cetermine the peak channel r. umbers for the main photopeaks.

To use markers : urn " Function" switch to Read, " Display Mode" to Markers, I/O Cevice Selector to Disclay and press Start.

The " Memory Sub Group" channel indicators can now be used to position markers.

137 60 4.2.8 The CS photopeak should appear at channel 1323 and the C0 photopeak should appear at channel 2665.

Set for a differential 137 of 1342 channels between the twc peaks (CS C060),

4.2.9 If the photopeaks do not have the proper number of cnannels ht'.<een, adjust " Fine Gain" on the amplifier.

Repeat steps 4.2.3 through 4.2.9 until correct numcer of channels appear between peaks.

4.2.10 Now adjust " Input Offset '/olts" until centroid channel coincides a

with the corAect photopeak energy, Receat steps ;.2.3 through 4.2.10 as necessary.

181 001 2.0 A

1958.2 Revision i 10/29/77 NOTE:

Since there is some interaction between the input offset volts and the amplifier gain, several attempts may be required to gt+ both peaks into proper channels.

4.2.11 Run a Cram program energy calibration per SCP 1958.3 and Redo 4.2.1 to 4.2.11 if necessary.

j 4.3 Analyzing a laboratory sample 4.3.1 Prepare the sample to be counted so that it conforms to a

_ cmetry for.vhich an efficiency vs. energy curve exists.

(SCP 1958.3 Appendix A).

. 3.2 Assure that an energy calibration has been run in the past 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

If not do an energy calibration before counting sample (SCP 1958.3 Sect. 4.1 ).

4.3.3 Place s; mole into correct counting gec etry on Geli Detector.

NOTE:

.A deadtime of less than 10-155 is des irable.

4.3.4 Erase the "CA by switching the " Function" switch t; Erase and press Start.

4.3.5 Set " Timing Control" to accumulate for 20 minutes.

(Ref.

Appendix A).

4.3.6 Place "Functicn" saitch in Accumulate and press Start.

4.3.7 When counting is complete analyze per SCP 1958.3 Section a.2.

4.4 Using the 9862 X-Y plotter with the 9830 calculator.

4.4.1 Place a piece of semi-logarithmic graph paper on plotter.

4.a.2 Cepress the "Line" buttcn to turn on the plotter.

4.4.3 Depress the " Chart Hold" buttor, to electrostatically hold paper to platen.

7 a.4.4 Remove small plastic cap fecm ;en and check for ink.

3.0

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1958.2 Revision 1 10/29/77 4.4.5 Depress " Pen Up" button.

4.4.6 Depress "Lcwer Left" button and adjust pen for left hand margins on paper by rotating arrowed knobs.

4.4.7 Depress " Upper Right" button and adjust pen for right hand margins by using the other set of arrowed knobs.

1 NOTE:

The plotter is now ready to receive signals frcm the 9830 calculator.

5.0 REFERENCES

5.1 Hewlett-Packard MCA Manuals 5.2 Hewlett-Packard 9830 Manuals 5.3 Princeton Gama Tech Geli Cetector Manuais 181 003

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1958.2 Revision 1 10/29/77 APIENDIX A A.

H51-18A ;scilloscope Control Position Intensity / Astigmatism Adjustable us Adjustable i

5: :e Adjustable Power On Horizontal Position / Fine Adjustable Magnifier XI Display

li AC/DC DC B.

54313 Display Plug In Control-Position Movable Cuarters CFF Cuarters Full Scale 4

Display Made Normal Rate Channeis/SE EXT Vertical Separation Adjustable Vertical Gain Adjustable Vertical Position Adjustable Hori:cntal Gain Adjustable HoriOntal Position Adj us table Counts /Div Adjustable

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1958.2 Revision i 10/29/77 C.

5422B Digital Processor Control Position Data Control ADD Function Adjustable Accumulate Mode PHA j

Accumulate Cycle Manual Sweep Mode Up/Up Timing Control Live Sample Time / Rate Adjustable (For 20 minutes-100 MS)

Preset Time / Sweeps Adjustable (For 20 minutes-1 K)

Sample Time / Rate

_ Adjustable (For 20 ninutes-X1)

Preset Minutes Adjus.

(For 20 minutes-X.02)

Count Up To Preset Start As Needed Stop As Needed D.

Memory Control Control Position Lower Eighth Group Selector A 1-2-3-4 Group Selector 3 1 3-4 Memory Sub Croup As Needed i

181 005 s.g

1953.2 Resision 1 10/29/77 E.

Discriminators/ Output Channels Control Position

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Lower / Trig 0 (or as necessary to Eliminate ticise Peaks)

Upper 10.0 (Maximum)

Range 4096 Offset 0

Var

-1 to +1 Ease Line *>onitor On Time To Peak Var Coincidence Tier.a1 Free Coincidence Strobed Free 100:1 Dead Time Input Offset Volts

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Adjustable

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5410A Power Supply / Interface Control Position I/ C vice Selector Printer 0

Power On G.

Liouid tiitrogen Level Monitor Control Position Fill Off Indicator Lights tiormal Lighted i

181 006

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1958.2 Revision 1 10/29/77 H.

Amplirier Model 340 Control Position Coarse Gain 100 Fine Gain Adjustable Input Polarity Neg

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Shaping 2 or 4 Unipolar Cutput Polarity Pos Range 10 V Restorer Low I.

Guarded HV Power Supply Control Position Cutput Polarity Positive Light HV On Voltage Unit 1 Geli - 2000 Unit 2 Geli - 1000 J.

Cannecting Cables 1.

Amplifier Model 340 unipolar cutput connected to analog to digital converter + 10V DC Input.

2.

HV connected to Geli preamp.

3.

Level monitor connected to cryostat.

4.

Geli preamp connected to amplifier Model 340.

5.

Amplifier Model 340 input (use rear terminal) connected to preamp output.

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