Revision as of 19:26, 7 November 2013

Goals

Use NaI to measure Y-88 coincidence lines of 1836 and 898 keV

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
6580	same as run 6579 but set pulser to 10 Hz to record run time in scaler channel 5
6581	same as run 6580
6582	same as run 6580 but using Cs-137 source # 129792, 19 min 36 sec,
6583	same as run 6580 but using Co-60 source # 124838, ,
6584	same as run 6580 but using Mn-54 source # 129804, ,

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

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 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.

@@ Line 109: / Line 109: @@
 | Mn-54|| 834.848 || ||
 |-
-| Co-60 || 1173.228|| ||
+| Co-60 || 1173.228||1718.59 +/- 1.8 ||
 |-
 | Na-22 || 1274.537|| ||