10312013 TestRun
Goals
Use NaI to measure Y-88 coincidence lines of 1836 and 898 keV
Runlist
| Run | Description | |
| 6559 | Coincidence run with Na-22 1 uCi source # 129742, ADC7 = HpGe, ADC3 = NaI, TDC16 = HpGe, TDC19 = NaI, Na-22's 1.2 keV photon is in channel 3600 for the HpGe detector and channel 500 for the NaI; need to decrease gain on HpGe so Y-88's 1.8 keV photon is in the ADC range | |
| 6560 | Changed HpGe spec amp integration from 0.5 usec shaping time to 0.25 and ran in singles mode | |
| 6561 | Running in coincidence mode, rate changed from about 70 Hz to about 2 Hz | |
| 6562 | Running in OR mode with activated Y-88 sample #130100-010 (highest intensity line is at 1460 keV) | |
| 6575 | same conditions as run 6571 but with activated Y-88 sample #130100-010 | |
| 6576 | same conditions as run 6575 Coincidence run started Thu 31 Oct 2013 11:37:34 AM MDT (1383241054), ran for 598790 seconds = 6.93 days | |
| 6577 | same conditions as run 6571 started on 11/7/13 OR mode | |
| 6578 | In OR mode, decreased threshold from 40 mV to 10 mV | |
| 6579 | same as run 6578 but only triggering on HpGe detector B , readback says its at 4520 volts, spec amp course gain = x20 , fine gain = 54, shaping time = .25 usec |
Energy Calibration
calibrate with Na-22 (511,1200), Co-60 (1.2, 1.3), Mn-54 (), Cs-137 (662 keV)
Calibration runs
Cd=109 has coincidence lines at 203 & 250 keV
| Run | Description | |
| 6567 | Singles run with only NaI detector and Co-60 source | |
| 6568 | singles runs with only HpGe detector and Co-60 source,October 31, 2013 4:54:03 PM MDT,1383238443-1383238497=54 seconds | |
| 6569 | OR mode, both detectors, 3k DAQ trigger rate. Co-60 1 uCi source # 129739 | |
| 6570 | Running in OR mode with Mn-54 source # 129806 700 Hz,October 31, 2013 4:58:07 PM MDT,1383238687-1383239009=322 sec | |
| 6571 | Running in OR mode with only NaI in trigger and Mn-54 source, increased threshold from 10 mV to 40 mV to count more high energy photons | |
| 6572 | same as run 6571 but using Na-22 1 uCi source # 129742, October 31, 2013 5:19:47 PM MDT, 1383239987-1383240130= 143 second | |
| 6573 | same as run 6571 but using Co-60 1 uCi source # 129739 | |
| 6574 | same as run 6571 but using and used Cs-137 1 uCi source #129793 |
| Source | Energy | HpGe ch # (ADC 7) | NaI ch # (ADC3) |
| Na-22 | 511 | 821.76 +/- 2.6 | 567.735 +/- 19.9 |
| Cs-137 | 661.657 | 1025.7 +/- 2.1 | 707.185 +/- 20.5 |
| Mn-54 | 834.848 | 1260.46 +/- 2.1 | 866.607 +/- 21.9 |
| Co-60 | 1173.228 | 1719.56 +/- 2.4 | 1173.85 +/- 35 |
| Na-22 | 1274.537 | 1856.88 +/- 2.2 | 1265.59 +/- 36 |
| Co-60 | 1332.492 | 1935.41 +/- 2.4 | 1318.99 +/- 34 |
HpGe Fit
A=-94.978 +/- 0.719711 B=0.737543 +/- 0.000480387
ntuple->Draw("ADC7*0.737543 - 94.978 >>r6573(2200,0,4400)")
3rd order
-95.4193 +- 3.43312 0.73824 +- 0.0053233 -2.49548e-07 +- 1.89781e-06
Activity
The photon spectrum measured on 10/31/13 from the Y-88 sample #130100-010 and a 1uCi Co-60 1 uCi source # 129739
The NaI-22 measured rate was 366.8 events/sec while the Y-88 rate was about 30.6 events/sec.
A 1uCi Mn-54 source # 129806 had a rate of 229.6 events/sec.
A rough estimate is that the Y-88 activity is less than 0.1 uCi.