Difference between revisions of "CH He3 Attenuation Measurements: 3 Different Cf252 Sources"

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='''Results'''=
 +
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<gallery heights="300" widths="350" class="center">
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CH_High_And_Unknown_Activity_Source.png|<span style="color:#FF0000">'''Red:'''</span> Log plot of scalar measurements using the high activity source with <small><math>Ae^Bx+C</math></small> fit. <span style="color:#0000ff">'''Blue:'''</span> Log plot of scalar measurements using the undetermined activity source with <small><math>Ae^Bx+C</math></small>
 +
 +
CH NoPolyScaled Borated Poly Atten He3 500uCi ADC 05192022.png|Energy spectrum of He3 tube using peak sensing ADC for the varying thicknesses of borated polyethylene. Note that the 0" of poly (open source) is scaled by <small><math>\frac{1}{3}</math></small>.
 +
 +
PS_Sim_He3_Energy_Spectrum_Cf252_05112022.png|Simulated energy spectrum of He3 tube in borated poly box.
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</gallery>
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='''Attenuation Experiment using New Modules in Electronics Chain and Inside Borated Poly Box'''=
 
='''Attenuation Experiment using New Modules in Electronics Chain and Inside Borated Poly Box'''=
  
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* Pulse width as measured on scope: ~43ns
 
* Pulse width as measured on scope: ~43ns
−
 
−
==='''Scope Images'''===
 
  
 
=='''Background Measurements'''==
 
=='''Background Measurements'''==
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| '''1250V Background Measurements'''||
 
| '''1250V Background Measurements'''||
 
|-
 
|-
−
|  Run Number || Configuration || Discriminator Threshold (mV) || Cf-252 Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
+
|  Run Number || Configuration || Discriminator Threshold (mV) || Cf-252 Source || Counts || Run Time (Sec)  
 
|-
 
|-
−
|  1  || Detector on 3D printed stands at +1250V || 255 || No || || 100 ||  ||
+
|  1  || Detector on 3D printed stands at +1250V || 255 || No || 33 || 100  
 
|-
 
|-
−
|  2  || Detector on 3D printed stands at +1250V || 255 || No || || 100 || ||
+
|  2  || Detector on 3D printed stands at +1250V || 255 || No || 24 || 100   
 
|-
 
|-
−
|  3  || Detector on 3D printed stands at +1250V || 255 || No || || 100 ||  ||
+
|  3  || Detector on 3D printed stands at +1250V || 255 || No || 30 || 100  
 
|-
 
|-
−
|  4  || Detector on 3D printed stands at +1250V || 255 || No || || 100 ||  ||
+
|  4  || Detector on 3D printed stands at +1250V || 255 || No || 26 || 100  
 
|-
 
|-
−
|  5  || Detector on 3D printed stands at +1250V || 255 || No || || 100 ||  ||
+
|  5  || Detector on 3D printed stands at +1250V || 255 || No || 19 || 100  
 
|-
 
|-
 
|}
 
|}
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|-
 
|-
 
|  5  || Detector on poly at +1250V || 80 || Yes || 394 || 100  
 
|  5  || Detector on poly at +1250V || 80 || Yes || 394 || 100  
 +
|-
 +
|}
 +
 +
==='''Lead Attenuation Measurements'''===
 +
 +
The purpose of these measurements was to determine if photon build up in the He3 tube was a significant effect to consider when trying to determine the activity of the Unknown Source
 +
 +
4/5/22
 +
 +
===='''Lead Open Source'''====
 +
 +
{| class="wikitable mw-collapsible mw-collapsed" border="2" style="text-align:center;" |cellpadding="20" cellspacing="1
 +
|-
 +
| '''1250V source in'''||
 +
|-
 +
|  Run Number || Configuration || Discriminator Threshold (mV) || Cf-252 Source || Counts || Run Time (Sec)
 +
|-
 +
|  1  || Detector on poly at +1250V || 80 || Yes || 3873 || 100
 +
|-
 +
|  2  || Detector on poly at +1250V || 80 || Yes || 3909 || 100
 +
|-
 +
|  3  || Detector on poly at +1250V || 80 || Yes || 3859 || 100 
 +
|-
 +
|  4  || Detector on poly at +1250V || 80 || Yes || 3944 || 100 
 +
|-
 +
|  5  || Detector on poly at +1250V || 80 || Yes || 3812 || 100 
 +
|-
 +
|}
 +
 +
===='''1" Lead'''====
 +
 +
{| class="wikitable mw-collapsible mw-collapsed" border="2" style="text-align:center;" |cellpadding="20" cellspacing="1
 +
|-
 +
| '''1250V source in'''||
 +
|-
 +
|  Run Number || Configuration || Discriminator Threshold (mV) || Cf-252 Source || Counts || Run Time (Sec)
 +
|-
 +
|  1  || Detector on poly at +1250V || 80 || Yes || 4152 || 100
 +
|-
 +
|  2  || Detector on poly at +1250V || 80 || Yes || 3945 || 100 
 +
|-
 +
|  3  || Detector on poly at +1250V || 80 || Yes || 4141 || 100 
 +
|-
 +
|  4  || Detector on poly at +1250V || 80 || Yes || 3974 || 100
 +
|-
 +
|  5  || Detector on poly at +1250V || 80 || Yes || 4154 || 100 
 +
|-
 +
|}
 +
 +
===='''2" Lead'''====
 +
 +
{| class="wikitable mw-collapsible mw-collapsed" border="2" style="text-align:center;" |cellpadding="20" cellspacing="1
 +
|-
 +
| '''1250V source in'''||
 +
|-
 +
|  Run Number || Configuration || Discriminator Threshold (mV) || Cf-252 Source || Counts || Run Time (Sec)
 +
|-
 +
|  1  || Detector on poly at +1250V || 80 || Yes || 3509 || 100
 +
|-
 +
|  2  || Detector on poly at +1250V || 80 || Yes || 3472 || 100
 +
|-
 +
|  3  || Detector on poly at +1250V || 80 || Yes || 3387 || 100
 +
|-
 +
|  4  || Detector on poly at +1250V || 80 || Yes || 3488 || 100
 +
|-
 +
|  5  || Detector on poly at +1250V || 80 || Yes || 3463 || 100 
 +
|-
 +
|}
 +
 +
===='''3" Lead'''====
 +
 +
{| class="wikitable mw-collapsible mw-collapsed" border="2" style="text-align:center;" |cellpadding="20" cellspacing="1
 +
|-
 +
| '''1250V source in'''||
 +
|-
 +
|  Run Number || Configuration || Discriminator Threshold (mV) || Cf-252 Source || Counts || Run Time (Sec)
 +
|-
 +
|  1  || Detector on poly at +1250V || 80 || Yes || 2995 || 100
 +
|-
 +
|  2  || Detector on poly at +1250V || 80 || Yes || 2921 || 100
 +
|-
 +
|  3  || Detector on poly at +1250V || 80 || Yes || 2956 || 100
 +
|-
 +
|  4  || Detector on poly at +1250V || 80 || Yes || 2916 || 100 
 +
|-
 +
|  5  || Detector on poly at +1250V || 80 || Yes || 3015 || 100
 +
|-
 +
|}
 +
 +
===='''4" Lead'''====
 +
 +
{| class="wikitable mw-collapsible mw-collapsed" border="2" style="text-align:center;" |cellpadding="20" cellspacing="1
 +
|-
 +
| '''1250V source in'''||
 +
|-
 +
|  Run Number || Configuration || Discriminator Threshold (mV) || Cf-252 Source || Counts || Run Time (Sec)
 +
|-
 +
|  1  || Detector on poly at +1250V || 80 || Yes || 2630 || 100 
 +
|-
 +
|  2  || Detector on poly at +1250V || 80 || Yes || 2601 || 100 
 +
|-
 +
|  3  || Detector on poly at +1250V || 80 || Yes || 2558 || 100
 +
|-
 +
|  4  || Detector on poly at +1250V || 80 || Yes || 2629 || 100
 +
|-
 +
|  5  || Detector on poly at +1250V || 80 || Yes || 2650 || 100 
 
|-
 
|-
 
|}
 
|}
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|-
 
|-
 
|}
 
|}
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----
 
  
 
='''Previous Page'''=
 
='''Previous Page'''=
  
 
[[CaGaS Phase II]]
 
[[CaGaS Phase II]]

Latest revision as of 18:21, 17 June 2022

Results

  • Red: Log plot of scalar measurements using the high activity source with [math]Ae^Bx+C[/math] fit. Blue: Log plot of scalar measurements using the undetermined activity source with [math]Ae^Bx+C[/math]

  • Energy spectrum of He3 tube using peak sensing ADC for the varying thicknesses of borated polyethylene. Note that the 0" of poly (open source) is scaled by [math]\frac{1}{3}[/math].

  • Simulated energy spectrum of He3 tube in borated poly box.

Attenuation Experiment using New Modules in Electronics Chain and Inside Borated Poly Box

Electronics Chain (Poly Box)

Include schematic of electronics chain

Components

Each component of electronics chain with make/model, function, and brief description of why it's present

Ortec 142PC Pre-amp

Pre-amp for the He3 tube

CAEN Quad Linear Fan In - Fan Out Model N25 Tag #15687

  • The fan in/out is used to duplicate the pulse to run the spec amp and watch the signal on the scope for any anomalies.
  • The fan in/out is also used to invert the signal from the spec amp to send a negative pulse to the discriminator to trigger the scalar.

Ortec Spec Amp Model 672

  • 10x Course Gain
  • 1x Fine Gain
  • 0.5us Shaping Time
  • Uni Shaping: Gaussian
  • Input: Norm (+)
  • Output: Unipolar
  • Manual Pole Zero adjustment

LeCroy Discriminator Model 821 Serial #B16303

  • Variable threshold
  • Pulse width as measured on scope: ~43ns

Background Measurements

1250V Background Measurements
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on 3D printed stands at +1250V 255 No 33 100
2 Detector on 3D printed stands at +1250V 255 No 24 100
3 Detector on 3D printed stands at +1250V 255 No 30 100
4 Detector on 3D printed stands at +1250V 255 No 26 100
5 Detector on 3D printed stands at +1250V 255 No 19 100

High Activity Source Poly Box Attenuation Measurements

472[math]\mu[/math]Ci at time of measurement.

Open Source

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on poly at +1250V 80 Yes 34456 10
2 Detector on poly at +1250V 80 Yes 34920 10
3 Detector on poly at +1250V 80 Yes 34422 10
4 Detector on poly at +1250V 80 Yes 34007 10
5 Detector on poly at +1250V 80 Yes 34420 10

2" Green poly (one brick) in Box

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on poly at +1250V 80 Yes 7538 10
2 Detector on poly at +1250V 80 Yes 7515 10
3 Detector on poly at +1250V 80 Yes 7613 10
4 Detector on poly at +1250V 80 Yes 7566 10
5 Detector on poly at +1250V 80 Yes 7510 10

4" Green poly (two bricks) in Box

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on poly at +1250V 80 Yes 4758 10
2 Detector on poly at +1250V 80 Yes 4798 10
3 Detector on poly at +1250V 80 Yes 4722 10
4 Detector on poly at +1250V 80 Yes 4859 10
5 Detector on poly at +1250V 80 Yes 4672 10

6" Green poly (three bricks) in Box

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on poly at +1250V 80 Yes 3664 10
2 Detector on poly at +1250V 80 Yes 3627 10
3 Detector on poly at +1250V 80 Yes 3699 10
4 Detector on poly at +1250V 80 Yes 3688 10
5 Detector on poly at +1250V 80 Yes 3500 10

8" Green poly (four bricks) in Box

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on poly at +1250V 80 Yes 3140 10
2 Detector on poly at +1250V 80 Yes 3064 10
3 Detector on poly at +1250V 80 Yes 3030 10
4 Detector on poly at +1250V 80 Yes 3095 10
5 Detector on poly at +1250V 80 Yes 3113 10

Undetermined Activity Source Poly Box Attenuation Measurements

Open Source

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on poly at +1250V 80 Yes 3873 100
2 Detector on poly at +1250V 80 Yes 3909 100
3 Detector on poly at +1250V 80 Yes 3859 100
4 Detector on poly at +1250V 80 Yes 3944 100
5 Detector on poly at +1250V 80 Yes 3812 100

2" Green poly (one brick) in Box

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on poly at +1250V 80 Yes 764 100
2 Detector on poly at +1250V 80 Yes 819 100
3 Detector on poly at +1250V 80 Yes 818 100
4 Detector on poly at +1250V 80 Yes 815 100
5 Detector on poly at +1250V 80 Yes 913 100

4" Green poly (two bricks) in Box

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on poly at +1250V 80 Yes 486 100
2 Detector on poly at +1250V 80 Yes 509 100
3 Detector on poly at +1250V 80 Yes 531 100
4 Detector on poly at +1250V 80 Yes 544 100
5 Detector on poly at +1250V 80 Yes 530 100

6" Green poly (three bricks) in Box

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on poly at +1250V 80 Yes 415 100
2 Detector on poly at +1250V 80 Yes 373 100
3 Detector on poly at +1250V 80 Yes 380 100
4 Detector on poly at +1250V 80 Yes 397 100
5 Detector on poly at +1250V 80 Yes 419 100

8" Green poly (four bricks) in Box

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on poly at +1250V 80 Yes 371 100
2 Detector on poly at +1250V 80 Yes 396 100
3 Detector on poly at +1250V 80 Yes 351 100
4 Detector on poly at +1250V 80 Yes 366 100
5 Detector on poly at +1250V 80 Yes 394 100

Lead Attenuation Measurements

The purpose of these measurements was to determine if photon build up in the He3 tube was a significant effect to consider when trying to determine the activity of the Unknown Source

4/5/22

Lead Open Source

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on poly at +1250V 80 Yes 3873 100
2 Detector on poly at +1250V 80 Yes 3909 100
3 Detector on poly at +1250V 80 Yes 3859 100
4 Detector on poly at +1250V 80 Yes 3944 100
5 Detector on poly at +1250V 80 Yes 3812 100

1" Lead

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on poly at +1250V 80 Yes 4152 100
2 Detector on poly at +1250V 80 Yes 3945 100
3 Detector on poly at +1250V 80 Yes 4141 100
4 Detector on poly at +1250V 80 Yes 3974 100
5 Detector on poly at +1250V 80 Yes 4154 100

2" Lead

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on poly at +1250V 80 Yes 3509 100
2 Detector on poly at +1250V 80 Yes 3472 100
3 Detector on poly at +1250V 80 Yes 3387 100
4 Detector on poly at +1250V 80 Yes 3488 100
5 Detector on poly at +1250V 80 Yes 3463 100

3" Lead

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on poly at +1250V 80 Yes 2995 100
2 Detector on poly at +1250V 80 Yes 2921 100
3 Detector on poly at +1250V 80 Yes 2956 100
4 Detector on poly at +1250V 80 Yes 2916 100
5 Detector on poly at +1250V 80 Yes 3015 100

4" Lead

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on poly at +1250V 80 Yes 2630 100
2 Detector on poly at +1250V 80 Yes 2601 100
3 Detector on poly at +1250V 80 Yes 2558 100
4 Detector on poly at +1250V 80 Yes 2629 100
5 Detector on poly at +1250V 80 Yes 2650 100

Lowest Activity Source Poly Box Attenuation Measurements

Approximately 1.15[math]\mu[/math]Ci at time of measurement, according to ISU Radiation Safety

Open Source

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on poly at +1250V 80 Yes 31 100
2 Detector on poly at +1250V 80 Yes 32 100
3 Detector on poly at +1250V 80 Yes 26 100
4 Detector on poly at +1250V 80 Yes 23 100
5 Detector on poly at +1250V 80 Yes 29 100

2" Green poly (one brick) in Box

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on poly at +1250V 80 Yes 18 100
2 Detector on poly at +1250V 80 Yes 27 100
3 Detector on poly at +1250V 80 Yes 21 100
4 Detector on poly at +1250V 80 Yes 21 100
5 Detector on poly at +1250V 80 Yes 22 100

4" Green poly (two bricks) in Box

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on poly at +1250V 80 Yes 31 100
2 Detector on poly at +1250V 80 Yes 18 100
3 Detector on poly at +1250V 80 Yes 19 100
4 Detector on poly at +1250V 80 Yes 31 100
5 Detector on poly at +1250V 80 Yes 30 100

6" Green poly (three bricks) in Box

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on poly at +1250V 80 Yes 35 100
2 Detector on poly at +1250V 80 Yes 24 100
3 Detector on poly at +1250V 80 Yes 23 100
4 Detector on poly at +1250V 80 Yes 21 100
5 Detector on poly at +1250V 80 Yes 22 100

8" Green poly (four bricks) in Box

1250V source in
Run Number Configuration Discriminator Threshold (mV) Cf-252 Source Counts Run Time (Sec)
1 Detector on poly at +1250V 80 Yes 20 100
2 Detector on poly at +1250V 80 Yes 28 100
3 Detector on poly at +1250V 80 Yes 29 100
4 Detector on poly at +1250V 80 Yes 16 100
5 Detector on poly at +1250V 80 Yes 22 100

Previous Page

CaGaS Phase II

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