View source for Cf252 NaI detector test. 12 Apr 2012

[https://wiki.iac.isu.edu/index.php/PhotoFission_with_Polarized_Photons_from_HRRL go back]


==041212==


*NaI detector,
* 300 mV threshold on gate channel
* signal ADC4
*-1030V at the beginning
*-1055V at the end of run



{| border="1" cellspacing="0" style="text-align: center; width: 1000px "
! scope="col" width="8%" | Run #
! scope="col" width="15%" | source
! scope="col" width="15%" | shielding
! scope="col" width="8%" | cnts
! scope="col" width="8%" | rate
! scope="col" width="66%" | Comments
|-
|2775||Co-60 away from NaI   ||2" Pb around, no front shielding ||133,884 || ||
|-
|2776||bkgd                  ||2" Pb around, no front shielding ||7,289   || ||
|-
|2777||Co-60 infront of NaI  ||2" Pb around, no front shielding ||313,427 ||  
|align="left"|1.2 and 1.4 MeV peaks, small peak around 4.3 MeV
Calibration 1.4 MeV/575 cnls = 0.00243 MeV/cnl
|-
|2778||bkgd||2" Pb around, no front  ||15,822    ||41.75 Hz ||
|-
|2779||bkgd||all around 2" Pb around ||8,566     ||15.74 Hz ||align="left"|good area around 2000-3800 channels
|-
|2780||Cf252||all around 2" Pb around||          ||12 kHz ||align="left"|Cf252 just in front of NaI
|-
|2781||Cf252||all around 2" Pb around||          ||5.4 kHz ||align="left"|Cf252 about 15 cm away from NaI
|-
|2782||Cf252||all around 2" Pb around||607,790   ||1.1 kHz ||align="left"|Cf252 17" away from NaI
|-
|2784||Cf252||all around 2" Pb around||1,372,745 ||1,142 Hz ||align="left"|20 min run. No shielding in front
|-
|2785||Cf252||all around 2" Pb around||153,508   ||129.5 Hz ||align="left"|20 min run. 2" Pb just after Cf252
|-
|2787||Cf252||all around 2" Pb around||1,231,537 ||1,024 Hz ||align="left"|20 min run. 2" Borated Poly just after Cf252
|-
|2788||Cf252||all around 2" Pb around||1,225,232 ||1,020 Hz ||align="left"|20 min run. 2" Unborated Poly just after Cf252
|-
|2790||Cf252||all around 2" Pb around||132,067   ||111.6 Hz ||align="left"|20 min run. 2" Pb, 2" Borated Poly just after Cf252
|-
|2791||Cf252||all around 2" Pb around||108,603   ||89.6 Hz ||align="left"|20 min run. 4" Pb just after Cf252
|-
|2792||bkgd ||all around 2" Pb around||45,904    ||25.04 Hz ||align="left"|20 min run. background checking

|}


* rise time of NaI 50 ns
* decay time of NaI 3 us


*run 2784: Cf252 no shielding infront. 1,372,745 events
[[File:Cf no shielding infront.png | 700px]]

*run 2787: Cf252 2" Borated Poly infront. 1,231,537 events
[[File:Cf 2inchBoratedPoly infront.png | 700px]]

*run 2788: Cf252 2" Unborated Poly infront. 1,225,232 events
[[File:Cf 2inchUnBoratedPoly infront.png | 700px]]

*run 2792: background checking. 45,904 events
[[File:Background.png | 700px]]

*run 2785: Cf252 2" Pb infront. 153,508 events
[[File:Cf 2inchPb shlng infront.png | 700px]]

*run 2790: Cf252 2" Pb + 2" Borated Poly infront. 132,067 events
[[File:Cf 2inchBoratedPoly 2inchPb.png | 700px]]

*run 2791: Cf252 4" Pb infront. 108,603 events
[[File:Cf 4inchPb shlng infront.png | 700px]]

==041312==

*NaI detector,
* 300 mV threshold on gate channel
* signal ADC4
*-1036V switched to modern power supply


{| border="1" cellspacing="0" style="text-align: center; width: 1000px "
! scope="col" width="8%"  | Run #
! scope="col" width="10%" | source
! scope="col" width="8%"  | time
! scope="col" width="8%"  | cnts
! scope="col" width="8%"  | rate
! scope="col" width="66%" | Comments
|-
|2799||background    ||108 min||216941 ||37.86
|align="left"|2" Pb around, except on the top of NaI was from detetor 2" Al, 2" Poly around
|-
|2800||background    ||       ||        ||
|align="left"|2" Pb around, 4" Poly around

|}


[[File:Bkg.png |500px]] [[File:Cf252 Al aroundandIn.png |500px]]

[[File:Cf252 4inPb Al aroundandIn.png |500px]] [[File:Cf252 5inPb Al aroundandIn noBin.png |500px]]

[[File:Cf252 5inPb Al aroundandIn smallBin.png |500px]] [[File:Cf252 5inPb Al aroundandIn wholeBin.png |500px]]



*run 2799
[[File:Background run.png | 800px]]

*run 2800