Difference between revisions of "CH He3 Attenuation Measurements"

From New IAC Wiki
Jump to navigation Jump to search
(Replaced content with "* 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...")
Tag: Replaced
Line 10: Line 10:
 
=[[CH_PAS_He3_Poly_Boration_Study]]=
 
=[[CH_PAS_He3_Poly_Boration_Study]]=
  
−
 
−
='''Experimental Setup'''=
 
−
 
−
{| 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'''=
 
−
 
−
Posted 6/22/21
 
−
 
−
[[File:PAS_He3_Poly_Attenuation2.png|300px|thumb|none|Completed attenuation measurements with differing thicknesses of Borated Poly vs unborated poly.]]
 
−
 
−
The purple and green poly definitely have some boron concentration in them. The fitted curves are the same within uncertainty, so it should not matter which type of borated poly is used in our experimental setup.
 
  
 
='''Go Back'''=
 
='''Go Back'''=

Revision as of 21:42, 25 June 2021

  • 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

Go Back

PAS Experiment Attenuation Measurements

PAS_He3_Detector

PAS_Experiment

Retrieved from "https://wiki.iac.isu.edu/index.php?title=CH_He3_Attenuation_Measurements&oldid=127187"