CH PAS He3 BorAl Attenuation Study

Experimental Setup

Attenuation Measurements Setup
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

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		60
2	Detector on BorAl at +1250V	255	No		60
3	Detector on BorAl at +1250V	255	No		60
4	Detector on BorAl at +1250V	255	No		60
5	Detector on BorAl at +1250V	255	No		60

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	231	300
2	Detector on BorAl at +1250V	255	Yes	220	60
3	Detector on BorAl at +1250V	255	Yes	199	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		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) 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

CH He3 Attenuation Measurements