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 Button 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 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

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

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

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

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

CH He3 Attenuation Measurements