05/11/2011 - Revision history

Shaproma at 04:59, 12 May 2011

2011-05-12T04:59:37Z

2011-05-11T20:13:07Z

2011-05-11T20:12:36Z

2011-05-11T20:12:22Z

2011-05-11T20:11:42Z

2011-05-11T20:02:44Z

2011-05-11T19:56:43Z

2011-05-11T19:47:20Z

2011-05-11T19:42:32Z

2011-05-11T19:41:54Z

@@ Line 10: / Line 10: @@
-So it looks like my previous threshold value (-500 V) was not good. Let's set it up the -200 V. And let's see does the n's detector sensitive to the source. The same set up and distances as before.
+So it looks like my previous threshold value (-500 mV) was not good. Let's set it up the -200 mV. And let's see does the n's detector sensitive to the source. The same set up and distances as before.
 {| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
 ! scope="col" width="50" |

@@ Line 17: / Line 17: @@
 |-
 !n's
-|19.89<math>\pm</math>0.26   (5966 cnts) || 58.84<math>\pm</math>0.29   (17652 cnts)
+|19.89<math>\pm</math>0.26   (total 5966 cnts) || 58.84<math>\pm</math>0.29   (total 17652 cnts)
 |}

← Older revision		Revision as of 20:12, 11 May 2011
Line 22:		Line 22:
	So now we see the source. The ratio are:		So now we see the source. The ratio are:

−	<math>\frac{Rate_{source}}{Rate_{w/source}} = \frac{58.84}{19.89} = 2.96<math>	+	<math>\frac{Rate_{source}}{Rate_{w/source}} = \frac{58.84}{19.89} = 2.96 </math>

← Older revision		Revision as of 20:12, 11 May 2011
Line 22:		Line 22:
	So now we see the source. The ratio are:		So now we see the source. The ratio are:

−	<math>\~~farc~~{Rate_{source}}{Rate_{w/source}} = \frac{58.84}{19.89} = 2.96<math>	+	<math>\frac{Rate_{source}}{Rate_{w/source}} = \frac{58.84}{19.89} = 2.96<math>

@@ Line 17: / Line 17: @@
 |-
 !n's
-|19.89<math>\pm</math>0.26   (5966 cnts) ||
+|19.89<math>\pm</math>0.26   (5966 cnts) || 58.84<math>\pm</math>0.29   (17652 cnts)
 |}

@@ Line 10: / Line 10: @@
-So it looks like my previous threshold value (-500 V) was not good. Let's set it up the -200 V. And see what happens.
+So it looks like my previous threshold value (-500 V) was not good. Let's set it up the -200 V. And let's see does the n's detector sensitive to the source
 {| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
 ! scope="col" width="50" |
-! scope="col" width="50" | counts/min (1 min test)
+! scope="col" width="50" | counts/sec (5 min test), no source
-! scope="col" width="50" | counts/min (1 min test)
+! scope="col" width="50" | counts/sec (5 min test), with source on the top of detector
 |-
 !n's
+|
 |}

← Older revision		Revision as of 19:47, 11 May 2011
Line 10:		Line 10:


−	So it looks like my previous threshold value (-500 V) was not good. Let's set up the -200 V:	+	So it looks like my previous threshold value (-500 V) was not good. Let's set it up the -200 V. And see what happens.
		+
		+
		+	The same set up as before, the distances are the same:
		+
		+	[[File:Detector1.png \| 400px]]
		+
		+
		+
		+	First he CF-243 source is far far away (sealed in the safe):
		+	{\| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
		+	! scope="col" width="50" \|
		+	! scope="col" width="50" \| counts/min (1 min test)
		+	! scope="col" width="50" \| counts/min (1 min test)
		+	! scope="col" width="50" \| counts/min (1 min test)
		+	! scope="col" width="50" \| counts/min (1 min test)
		+	! scope="col" width="50" \| avg counts/min
		+	\|-
		+	!PS1
		+	\|
		+	\|-
		+	!PS2
		+	\|
		+	\|-
		+	!n's
		+	\|
		+	\|}
		+
		+
		+	Now the CF-243 source is on the top of PS1:
		+	{\| border="1" cellspacing="0" style="text-align: center; width: 800px; height: 100px;"
		+	! scope="col" width="50" \|
		+	! scope="col" width="50" \| counts/min (1 min test)
		+	! scope="col" width="50" \| counts/min (1 min test)
		+	! scope="col" width="50" \| counts/min (1 min test)
		+	! scope="col" width="50" \| counts/min (1 min test)
		+	! scope="col" width="50" \| avg counts/min
		+	\|-
		+	!PS1
		+	\|378,893\|\|378,612\|\|377,909\|\|378,665\|\|'''378,519.7'''
		+	\|-
		+	!PS2
		+	\|22,729\|\|22,819\|\|22,572\|\|22,530\|\|'''22,662.5'''
		+	\|-
		+	!PS1+PS2
		+	\|1044\|\|1021\|\|1023\|\|975\|\|'''1015.7'''
		+	\|-
		+	!n's
		+	\|200\|\|210\|\|228\|\|219\|\|'''214.2'''
		+	\|}

← Older revision		Revision as of 19:42, 11 May 2011
Line 1:		Line 1:
		+	[https://wiki.iac.isu.edu/index.php/N%27s_detector_calibration Go Back]
		+
		+
	Because is something wrong I decided to measure the counts rate as function of threshold energy. Maybe my threshold was incorrect.		Because is something wrong I decided to measure the counts rate as function of threshold energy. Maybe my threshold was incorrect.

← Older revision		Revision as of 19:41, 11 May 2011
Line 4:		Line 4:

	[[File:Det1 callibration.png \| 1000 px]]		[[File:Det1 callibration.png \| 1000 px]]
		+
		+
		+
		+	So it looks like my previous threshold value (-500 V) was not good. Let's set up the -200 V: