Poly box to contain Cf-252 source for attenuation measurements
[[File:|400px|thumb|none|He3 tube mounting for attenuation measurements ]]
[[File: |300px|thumb|none| ]]
[[File:|300px|thumb|none| ]]
Top down view of Cf-252 source in place, ready to be covered by top sheet of virgin poly
[[File: |300px|thumb|none| ]]
Measurements
Background Measurements
I will be performing background runs overnight due to the low amount of background counts. This is necessary to get an acceptable level of uncertainty in the measurements as the count rate looks to be on the order of .5Hz.
The first run background run is taking place the evening of 6/25/21 and will end the following day.
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 BorAl at +1250V
255
No
Source In
No thermalizer, no borated poly, just BorAl shielding around detector
1250V Source In Data
Run Number
Configuration
Discriminator Threshold (mV)
Cf-252 Source
Counts
Run Time (Sec)
Count Rate (Hz)
Uncertainty
1
Detector on BorAl at +1250V
255
Yes
236
300
2
Detector on BorAl at +1250V
255
Yes
263
60
3
Detector on BorAl at +1250V
255
Yes
251
60
4
Detector on BorAl at +1250V
255
Yes
203
60
5
Detector on BorAl at +1250V
255
Yes
218
60
Source In with Thermalizer
Thermalizer, no borated poly, & BorAl shielding around detector
1250V Source In Data
Run Number
Configuration
Discriminator Threshold (mV)
Cf-252 Source
Counts
Run Time (Sec)
Count Rate (Hz)
Uncertainty
1
Detector on BorAl at +1250V
255
Yes
300
2
Detector on BorAl at +1250V
255
Yes
60
3
Detector on BorAl at +1250V
255
Yes
60
4
Detector on BorAl at +1250V
255
Yes
60
5
Detector on BorAl at +1250V
255
Yes
60
Green Poly without Thermalizer
1" Green poly, no thermalizer
1250V source in
Run Number
Configuration
Discriminator Threshold (mV)
Cf-252 Source
Counts
Run Time (Sec)
Count Rate (Hz)
Uncertainty
1
Detector on poly at +1250V
255
Yes
300
2
Detector on poly at +1250V
255
Yes
300
3
Detector on poly at +1250V
255
Yes
300
4
Detector on poly at +1250V
255
Yes
300
5
Detector on poly at +1250V
255
Yes
300
2" Green poly (one brick) no thermalizer
1250V source in
Run Number
Configuration
Discriminator Threshold (mV)
Cf-252 Source
Counts
Run Time (Sec)
Count Rate (Hz)
Uncertainty
1
Detector on poly at +1250V
255
Yes
154
300
2
Detector on poly at +1250V
255
Yes
163
300
3
Detector on poly at +1250V
255
Yes
150
300
4
Detector on poly at +1250V
255
Yes
300
5
Detector on poly at +1250V
255
Yes
300
3" Green poly (one brick & sheet) no thermalizer
1250V source in
Run Number
Configuration
Discriminator Threshold (mV)
Cf-252 Source
Counts
Run Time (Sec)
Count Rate (Hz)
Uncertainty
1
Detector on poly at +1250V
255
Yes
300
2
Detector on poly at +1250V
255
Yes
300
3
Detector on poly at +1250V
255
Yes
300
4
Detector on poly at +1250V
255
Yes
300
5
Detector on poly at +1250V
255
Yes
300
4" Green poly (two bricks) no thermalizer
1250V source in
Run Number
Configuration
Discriminator Threshold (mV)
Cf-252 Source
Counts
Run Time (Sec)
Count Rate (Hz)
Uncertainty
1
Detector on poly at +1250V
255
Yes
300
2
Detector on poly at +1250V
255
Yes
300
3
Detector on poly at +1250V
255
Yes
300
4
Detector on poly at +1250V
255
Yes
300
5
Detector on poly at +1250V
255
Yes
300
6" Green poly (three bricks) no thermalizer
1250V source in
Run Number
Configuration
Discriminator Threshold (mV)
Cf-252 Source
Counts
Run Time (Sec)
Count Rate (Hz)
Uncertainty
1
Detector on poly at +1250V
255
Yes
300
2
Detector on poly at +1250V
255
Yes
300
3
Detector on poly at +1250V
255
Yes
300
4
Detector on poly at +1250V
255
Yes
300
5
Detector on poly at +1250V
255
Yes
300
8" Green poly (four bricks) no thermalizer
1250V source in
Run Number
Configuration
Discriminator Threshold (mV)
Cf-252 Source
Counts
Run Time (Sec)
Count Rate (Hz)
Uncertainty
1
Detector on poly at +1250V
255
Yes
300
2
Detector on poly at +1250V
255
Yes
300
3
Detector on poly at +1250V
255
Yes
300
4
Detector on poly at +1250V
255
Yes
300
5
Detector on poly at +1250V
255
Yes
300
Green Poly with Thermalizer
1" Green poly, with thermalizer
1250V source in
Run Number
Configuration
Discriminator Threshold (mV)
Cf-252 Source
Counts
Run Time (Sec)
Count Rate (Hz)
Uncertainty
1
Detector on poly at +1250V
255
Yes
300
2
Detector on poly at +1250V
255
Yes
300
3
Detector on poly at +1250V
255
Yes
300
4
Detector on poly at +1250V
255
Yes
300
5
Detector on poly at +1250V
255
Yes
300
2" Green poly (one brick) with thermalizer
1250V source in
Run Number
Configuration
Discriminator Threshold (mV)
Cf-252 Source
Counts
Run Time (Sec)
Count Rate (Hz)
Uncertainty
1
Detector on poly at +1250V
255
Yes
300
2
Detector on poly at +1250V
255
Yes
300
3
Detector on poly at +1250V
255
Yes
300
4
Detector on poly at +1250V
255
Yes
300
5
Detector on poly at +1250V
255
Yes
300
3" Green poly (one brick & sheet) with thermalizer
