Cf252 NaI detector test. 12 Apr 2012

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NaI detector, -1030V, 300 mV threshold on gate channel, signal ADC4


Run # source shielding cnts rate Comments
2775 Co-60 some distance away from NaI 2" Pb around, no front shielding
2776 bkgd 2" Pb around, no front shielding
2777 Co-60 on NaI taped 2" Pb around, no front shielding clear 2 big 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 shielding 41.75 Hz
2779 bkgd all around 2" Pb around 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 1.1 kHz Cf252 17" away from NaI
2784 Cf252 all around 2" Pb around 1,372,745 1,140 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" NoBorated 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 Cf252 all around 2" Pb around 20 min run. background checking


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


run 2784: Cf252 no shielding infront Cf no shielding infront.png

run 2785: Cf252 2" Pb infront

run 2787: Cf252 2" Borated Poly infront

run 2788: Cf252 2" NoBorated Poly infront

run 2790: Cf252 2" Pb + 2" Borated Poly infront

run 2791: Cf25242" Pb infront