Difference between revisions of "Cf252 NaI detector test. 12 Apr 2012"

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[https://wiki.iac.isu.edu/index.php/PhotoFission_with_Polarized_Photons_from_HRRL go back]
 
[https://wiki.iac.isu.edu/index.php/PhotoFission_with_Polarized_Photons_from_HRRL go back]
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=041212=
  
 
*NaI detector,
 
*NaI detector,
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*run 2791: Cf252 4" Pb infront. 108,603 events
 
*run 2791: Cf252 4" Pb infront. 108,603 events
 
[[File:Cf 4inchPb shlng infront.png]]
 
[[File:Cf 4inchPb shlng infront.png]]
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=041312=
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*NaI detector,
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* 300 mV threshold on gate channel
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* signal ADC4
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*-1036V switched to modern power supply
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{| border="1" cellspacing="0" style="text-align: center; width: 1000px "
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! scope="col" width="8%" | Run #
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! scope="col" width="15%" | source
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! scope="col" width="15%" | shielding
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! scope="col" width="8%" | cnts
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! scope="col" width="8%" | rate
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! scope="col" width="66%" | Comments
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|-
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|2799||Co-60 away from NaI  ||2" Pb around, no front shielding ||133,884 || ||
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|-
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|2777||Co-60 infront of NaI  ||2" Pb around, no front shielding ||313,427 || 
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|align="left"|1.2 and 1.4 MeV peaks, small peak around 4.3 MeV
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Calibration 1.4 MeV/575 cnls = 0.00243 MeV/cnl
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|}

Revision as of 21:16, 13 April 2012

go back


041212

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


Run # source shielding cnts rate 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 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 good area around 2000-3800 channels
2780 Cf252 all around 2" Pb around 12 kHz Cf252 just in front of NaI
2781 Cf252 all around 2" Pb around 5.4 kHz Cf252 about 15 cm away from NaI
2782 Cf252 all around 2" Pb around 607,790 1.1 kHz Cf252 17" away from NaI
2784 Cf252 all around 2" Pb around 1,372,745 1,142 Hz 20 min run. No shielding in front
2785 Cf252 all around 2" Pb around 153,508 129.5 Hz 20 min run. 2" Pb just after Cf252
2787 Cf252 all around 2" Pb around 1,231,537 1,024 Hz 20 min run. 2" Borated Poly just after Cf252
2788 Cf252 all around 2" Pb around 1,225,232 1,020 Hz 20 min run. 2" Unborated Poly just after Cf252
2790 Cf252 all around 2" Pb around 132,067 111.6 Hz 20 min run. 2" Pb, 2" Borated Poly just after Cf252
2791 Cf252 all around 2" Pb around 108,603 89.6 Hz 20 min run. 4" Pb just after Cf252
2792 bkgd all around 2" Pb around 45,904 25.04 Hz 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

Cf no shielding infront.png

  • run 2787: Cf252 2" Borated Poly infront. 1,231,537 events

Cf 2inchBoratedPoly infront.png

  • run 2788: Cf252 2" Unborated Poly infront. 1,225,232 events

Cf 2inchUnBoratedPoly infront.png

  • run 2792: background checking. 45,904 events

Background.png

  • run 2785: Cf252 2" Pb infront. 153,508 events

Cf 2inchPb shlng infront.png

  • run 2790: Cf252 2" Pb + 2" Borated Poly infront. 132,067 events

Cf 2inchBoratedPoly 2inchPb.png

  • run 2791: Cf252 4" Pb infront. 108,603 events

Cf 4inchPb shlng infront.png


041312

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


Run # source shielding cnts rate Comments
2799 Co-60 away from NaI 2" Pb around, no front shielding 133,884
2777 Co-60 infront of NaI 2" Pb around, no front shielding 313,427 1.2 and 1.4 MeV peaks, small peak around 4.3 MeV

Calibration 1.4 MeV/575 cnls = 0.00243 MeV/cnl

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