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
6575	same conditions as run 6571 but with activated Y-88 sample #130100-010

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
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

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

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 event/sec.

A rough estimate is that the Y-88 activity is less than 0.1 uCi.