Difference between revisions of "CH He3 Attenuation Measurements"

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*** Pretty quick and dirty measurement to figure out which poly is best  
 
*** Pretty quick and dirty measurement to figure out which poly is best  
  
 +
=[[CH_PAS_He3_Poly_Boration_Study]]=
  
−
='''Experimental Setup'''=
+
=[[CH_PAS_He3_BorAl_Attenuation_Study]]=
−
 
 
−
{| class="wikitable mw-collapsible mw-collapsed" border="2" style="text-align:center;" |cellpadding="20" cellspacing="1
 
−
|-
 
−
| '''Attenuation Measurements Setup'''||
 
−
|-
 
−
| [[File:PAS Cf-252 Poly Box.jpg|300px|thumb|none| Poly box to contain Cf-252 source for attenuation measurements ]] || [[File:PAS He3 Tube mounting.jpg|400px|thumb|none|He3 tube mounting for attenuation measurements ]] || [[File:PAS_He3_tube_mounting_for_attenuation_measurements.jpg |300px|thumb|none|He3 tube mounted on 2" of virgin poly for attenuation measurements ]]
 
−
|-
 
−
| [[File:PAS_Cf-252_thermalizing_box_for_attenuation_measurements.jpg|300px|thumb|none| Full poly box with lid pulled back for easy insertion of Cf-252 source ]] || [[File:PAS_Cf-252_in_place_for_attenuation_measurements.jpg|300px|thumb|center|Top down view of Cf-252 source in place, ready to be covered by top sheet of virgin poly ]] || [[File:PAS_Side_view_attenuation_setup.jpg |300px|thumb|none|Full setup with 8.5" of purple borated poly in place ]]
 
−
|-
 
−
|}
 
−
 
 
−
 
 
−
 
 
−
 
 
−
He3 tube is mounted on 2" of virgin poly to put it at rough center of californium source
 
−
 
 
−
Cf252 source is enclosed in thermalizing virgin poly box
 
−
 
 
−
He3 tube is 8.5" from outside face of thermalizer
 
−
 
 
−
Cf252 is mounted approximately .5" behind thermalizing poly plate
 
−
 
 
−
Thermalizing poly plate is 1" thick
 
−
 
 
−
Will upload pictures and attached comments to each picture
 
−
 
 
−
='''Measurements'''=
 
−
 
 
−
=='''Background Measurements'''==
 
−
 
 
−
{| class="wikitable mw-collapsible mw-collapsed" border="2" style="text-align:center;" |cellpadding="20" cellspacing="1
 
−
|-
 
−
| '''1250V Source Out Data'''||
 
−
|-
 
−
|  Run Number || Configuration || Discriminator Threshold (mV) || Cf-252 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || No || 32 || 300 || 0.107 || 0.019
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || No || 44 || 300 || 0.147 || 0.022
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || No || 55 || 300 || 0.183 || 0.025
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || No || 34 || 300 || 0.113 || 0.019
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || No || 20 || 300 || 0.067 || 0.015
 
−
|-
 
−
|}
 
−
 
 
−
=='''Source In'''==
 
−
 
 
−
{| 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 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes || 11255 || 300 ||  ||
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes || 10996 || 300 ||  ||
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes || 10750 || 300 ||  ||
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes || 10815 || 300 ||  ||
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes || 10696 || 300 ||  ||
 
−
|-
 
−
|}
 
−
 
 
−
=='''Purple Poly without Thermalizer'''==
 
−
 
 
−
For some reason, the purple poly bricks are 1 1/8" thick
 
−
 
 
−
==='''1" Purple poly, no thermalizer'''===
 
−
 
 
−
{| 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 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes || 2816 || 300 || 9.39 || 0.177
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes || 2809 || 300 || 9.36 || 0.177
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes || 2774 || 300 || 9.25 || 0.176
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes || 2790 || 300 || 9.30 || 0.176
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes || 2875 || 300 || 9.58 || 0.179
 
−
|-
 
−
|}
 
−
 
 
−
==='''2 1/8" Purple poly (one brick) no thermalizer'''===
 
−
 
 
−
{| 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 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes || 2118 || 300 || 7.06 || 0.153
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes || 2012 || 300 || 6.71 || 0.150
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes || 2092 || 300 || 6.97 || 0.152
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes || 2025 || 300 || 6.75 || 0.150
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes || 2092 || 300 || 6.97 || 0.152
 
−
|-
 
−
|}
 
−
 
 
−
==='''3 1/8" Purple poly (one brick & sheet) no thermalizer'''===
 
−
 
 
−
{| 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 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes || 1434 || 300 || 4.78 || 0.126
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes || 1348 || 300 || 4.49 || 0.122
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes || 1489 || 300 || 4.96 || 0.129
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes || 1393 || 300 || 4.64 || 0.124
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes || 1372 || 300 || 4.57 || 0.124
 
−
|-
 
−
|}
 
−
 
 
−
==='''4 1/4" Purple poly (two bricks) no thermalizer'''===
 
−
 
 
−
{| 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 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes || 1093 || 300 || 3.64 || 0.110
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes || 1068 || 300 || 3.56 || 0.109
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes || 1116 || 300 || 3.72 || 0.111
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes || 1031 || 300 || 3.44 || 0.107
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes || 1142 || 300 || 3.81 || 0.113
 
−
|-
 
−
|}
 
−
 
 
−
==='''6 3/8" Purple poly (two bricks) no thermalizer'''===
 
−
 
 
−
{| 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 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes || 743 || 300 || 2.48 || 0.091
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes || 694 || 300 || 2.31 || 0.088
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes || 756 || 300 || 2.52 || 0.092
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes || 735 || 300 || 2.45 || 0.090
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes || 745 || 300 || 2.48 || 0.091
 
−
|-
 
−
|}
 
−
 
 
−
==='''8 1/2" Purple poly (two bricks) no thermalizer'''===
 
−
 
 
−
{| 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 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes || 662 || 300 || 2.21 || 0.086
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes || 586 || 300 || 1.95 || 0.081
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes || 613 || 300 || 2.04 || 0.083
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes || 560 || 300 || 1.87 || 0.079
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes || 622 || 300 || 2.07 || 0.083
 
−
|-
 
−
|}
 
−
 
 
−
=='''Purple poly with Thermalizer'''==
 
−
 
 
−
==='''2 1/8" Purple poly (one brick) with thermalizer'''===
 
−
 
 
−
{| class="wikitable mw-collapsible mw-collapsed" border="2" style="text-align:center;" |cellpadding="20" cellspacing="1
 
−
|-
 
−
| '''1250V Thermalized source'''||
 
−
|-
 
−
|  Run Number || Configuration || Discriminator Threshold (mV) || Cf-252 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes, thermalized || 2117 || 300 || 7.06 || 0.153
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes, thermalized || 1869 || 300 || 6.23 || 0.144
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes, thermalized || 1836 || 300 || 6.12 || 0.143
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes, thermalized || 1893 || 300 || 6.31 || 0.145
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes, thermalized || 1886 || 300 || 6.29 || 0.145
 
−
|-
 
−
|}
 
−
 
 
−
=='''Green Poly without Thermalizer'''==
 
−
 
 
−
==='''1" Green poly, no thermalizer'''===
 
−
 
 
−
{| 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 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes || 2566 || 300 || 8.55 || 0.169
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes || 2627 || 300 || 8.76 || 0.171
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes || 2559 || 300 || 8.53 || 0.169
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes || 2562 || 300 || 8.54 || 0.169
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes || 2660 || 300 || 8.87 || 0.172
 
−
|-
 
−
|}
 
−
 
 
−
==='''2" Green poly (one brick) no thermalizer'''===
 
−
 
 
−
{| 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 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes || 2176 || 300 || 7.25 || 0.155
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes || 2070 || 300 || 6.90 || 0.152
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes || 2055 || 300 || 6.85 || 0.151
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes || 2131 || 300 || 7.10 || 0.154
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes || 1957 || 300 || 6.52 || 0.147
 
−
|-
 
−
|}
 
−
 
 
−
==='''3" Green poly (one brick & sheet) no thermalizer'''===
 
−
 
 
−
{| 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 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes || 1345 || 300 || 4.48 || 0.122
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes || 1335 || 300 || 4.45 || 0.122
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes || 1295 || 300 || 4.32 || 0.120
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes || 1384 || 300 || 4.61 || 0.124
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes || 1297 || 300 || 4.32 || 0.120
 
−
|-
 
−
|}
 
−
 
 
−
==='''4" Green poly (two bricks) no thermalizer'''===
 
−
 
 
−
{| 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 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes || 1056 || 300 || 3.52 || 0.108
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes || 1085 || 300 || 3.62 || 0.110
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes || 1151 || 300 || 3.84 || 0.113
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes || 1064 || 300 || 3.55 || 0.109
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes || 1059 || 300 || 3.53 || 0.108
 
−
|-
 
−
|}
 
−
 
 
−
==='''6" Green poly (three bricks) no thermalizer'''===
 
−
 
 
−
{| 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 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes || 728 || 300 || 2.43 || 0.090
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes || 737 || 300 || 2.46 || 0.090
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes || 759 || 300 || 2.53 || 0.092
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes || 717 || 300 || 2.39 || 0.089
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes || 764 || 300 || 2.55 || 0.092
 
−
|-
 
−
|}
 
−
 
 
−
==='''8" Green poly (four bricks) no thermalizer'''===
 
−
 
 
−
{| 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 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes || 612 || 300 || 2.04 || 0.082
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes || 606 || 300 || 2.02 || 0.082
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes || 582 || 300 || 1.94 || 0.080
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes || 606 || 300 || 2.04 || 0.082
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes || 597 || 300 || 1.99 || 0.081
 
−
|-
 
−
|}
 
−
 
 
−
=='''Green Poly with Thermalizer'''==
 
−
 
 
−
==='''2 1/8" Green poly (one brick) with thermalizer'''===
 
−
 
 
−
{| class="wikitable mw-collapsible mw-collapsed" border="2" style="text-align:center;" |cellpadding="20" cellspacing="1
 
−
|-
 
−
| '''1250V Thermalized source'''||
 
−
|-
 
−
|  Run Number || Configuration || Discriminator Threshold (mV) || Cf-252 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes, thermalized || 1904 || 300 || 6.35 || 0.145
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes, thermalized || 1829 || 300 || 6.10 || 0.143
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes, thermalized || 1851 || 300 || 6.17 || 0.143
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes, thermalized || 1887 || 300 || 6.29 || 0.145
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes, thermalized || 1914 || 300 || 6.38 || 0.146
 
−
|-
 
−
|}
 
−
 
 
−
=='''Virgin Poly'''==
 
−
 
 
−
==='''1" Virgin Poly (one sheet)'''===
 
−
 
 
−
{| 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 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes || 12743 || 300 || 42.47 || 0.376
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes || 13109 || 300 || 43.69 || 0.382
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes || 13052 || 300 || 43.51 || 0.381
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes || 13136 || 300 || 43.79 || 0.382
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes || 13064 || 300 || 43.55 || 0.381
 
−
|-
 
−
|}
 
−
 
 
−
==='''2" Virgin Poly (one brick)'''===
 
−
 
 
−
{| 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 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes || 11950 || 300 ||  ||
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes || 12088 || 300 ||  ||
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes || 12068 || 300 ||  ||
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes || 12163 || 300 ||  ||
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes || 12183 || 300 ||  ||
 
−
|-
 
−
|}
 
−
 
 
−
==='''3" Virgin Poly (one sheet & one brick)'''===
 
−
 
 
−
{| 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 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes || 9185 || 300 ||  ||
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes || 9091 || 300 ||  ||
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes || 9040 || 300 ||  ||
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes || 9211 || 300 ||  ||
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes || 9035 || 300 ||  ||
 
−
|-
 
−
|}
 
−
 
 
−
==='''4" Virgin Poly (two bricks)'''===
 
−
 
 
−
{| 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 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes || 5924 || 300 ||  ||
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes || 6232 || 300 ||  ||
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes || 6006 || 300 ||  ||
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes || 5978 || 300 ||  ||
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes || 6222 || 300 ||  ||
 
−
|-
 
−
|}
 
−
 
 
−
==='''6" Virgin Poly (3 bricks)'''===
 
−
 
 
−
{| 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 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes || 2837 || 300 ||  ||
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes || 2985 || 300 ||  ||
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes || 3019 || 300 ||  ||
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes || 2912 || 300 ||  ||
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes || 3009 || 300 ||  ||
 
−
|-
 
−
|}
 
−
 
 
−
==='''8" Virgin Poly (four bricks)'''===
 
−
 
 
−
{| 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 Button Source || Counts || Run Time (Sec) || Count Rate (Hz) || Uncertainty
 
−
|-
 
−
|  1  || Detector on poly at +1250V || 255 || Yes || 1974 || 300 ||  ||
 
−
|-
 
−
|  2  || Detector on poly at +1250V || 255 || Yes || 2006 || 300 ||  ||
 
−
|-
 
−
|  3  || Detector on poly at +1250V || 255 || Yes || 1975 || 300 ||  ||
 
−
|-
 
−
|  4  || Detector on poly at +1250V || 255 || Yes || 2069 || 300 ||  ||
 
−
|-
 
−
|  5  || Detector on poly at +1250V || 255 || Yes || 1990 || 300 ||  ||
 
−
|-
 
−
|}
 
  
 
='''Results'''=
 
='''Results'''=
  
−
[[File:PAS_He3_Poly_Attenuation2.png|300px|thumb|none|Completed attenuation measurements with differing thicknesses of Borated Poly vs unborated poly.]]
+
[[File:BorAl_Poly_BPoly_Neutron_Attenuation.png|300px|thumb|none|Completed attenuation measurements with differing thicknesses of Borated Poly vs unborated poly with and without BorAl.]]
  
 +
----
 +
='''Previous Page'''=
  
−
 
−
 
−
 
−
 
−
 
−
 
−
----
 
 
[[PAS Experiment Attenuation Measurements]]
 
[[PAS Experiment Attenuation Measurements]]
  
Line 507: Line 24:
  
 
[[PAS_Experiment]]
 
[[PAS_Experiment]]
 +
 +
[[CaGaS Phase II]]

Latest revision as of 18:49, 27 January 2022

  • Build poly box to house source and help thermalize neutron flux
  • Get Cf source
  • Measure rates in He3 tube with differing amounts of poly (and different types) -> get to background levels
    • Thermalize neutron flux from Cf with virgin poly for all measurements
    • Build virgin poly box around Cf source
      • Pretty quick and dirty measurement to figure out which poly is best

CH_PAS_He3_Poly_Boration_Study

CH_PAS_He3_BorAl_Attenuation_Study

Results

Completed attenuation measurements with differing thicknesses of Borated Poly vs unborated poly with and without BorAl.

Previous Page

PAS Experiment Attenuation Measurements

PAS_He3_Detector

PAS_Experiment

CaGaS Phase II

Retrieved from "https://wiki.iac.isu.edu/index.php?title=CH_He3_Attenuation_Measurements&oldid=128247"