Run6973 BckGrd
Singles backgrounds
Singles back ground sources
Tl-208: 277, 583, 860 Pb-214: 241, 295, 351 Bi-214: 609, 1120, 1238, 1764
Run 6973
run time recorded by 10 Hx clock into scaler channel 5
5976273-66=5976207/10 = 59762.07 seconds = 166 hrs = 6.9 days
At event number 1941300 the scaler reads the same value, I think the DAQ failed right when the HV on the HpGe tripped.
The HpGe detector warmed up during the run after about Event Number 1916000, you can tell the HV tripped because ADC7 starts loose events above 1500 channels after EventNumber >1910300
compare the plots
ntuple->Draw("ADC7 >>(1100,0,4400)","EventNumber>1941300 && EventNumber < 2000000")
ntuple->Draw("ADC7 >>(1100,0,4400)","EventNumber>1901300 && EventNumber < 2000000")
The following lines were observed by the HpGe detector.
387, 583, 609, 1273, 1456, 1591, 2103
NaI 511 coincidence cut
Place a cut around the 511 keV photons seen in the NaI detector yields the following lines observed by the HpGe detector as shown below.
(386, 438, 491, 511, 582, 950, 1255, 1273, 1591, 2103 keV)
with a half life of 13 years.
gamma lines are at : 386, 493
NaI 2103 Coincidence cut
Place a cut around the 2103 keV photons seen in the NaI detector yields a 511 and a 583 keV line observed by the HpGe detector as shown below.
A line at 388 keV
- Possible Isotopes
- U-235 (388 - 142,64.5)
- Cf-249 (many coincidence lines)
A clear 511 line
- NaI cut on 2100 keV intensifies 511 keV line,
ntuple->Draw("ADC7*0.604262-54.0539-ADC7*ADC7*5.62792e-07 >>(2200,0,4400)","ADC3>1600 & ADC3<1800")
A line at 609 keV
- Possible isotopes
- Pa-231
A line at 1273 keV
A line at 1593 keV
A line at 2105 keV