Au-196 Foil-08-22-13
Gold irradiation physics
Knock a neutron out of natural gold such that an excited state of Au-196 remains that will undergo electron capture to Pt-196 with a half life of 6 days or 2% of the time it can be left in a meta stable state with two possible half lifes of 8 seconds or 9 hours.
The 8 sec metastable state of Au-196 decays through the emission of only one 84.66 keV photon.
The 9.6 hour metastable state has high intensity gamma lines at 147.81 keV and 188.27 keV. The 147.81 and the 188.27 are in coincidence.
with a half life of 6 days.
The Pt-196 has a 355.73 dominant (100% relative intensity) gamma line that goes to the 256.2 state giving off a 97.3 keV photon
Irradiation of foil 130100-009
Irradiation finished at August 22, 2013 1:52:41 PM MDT(unix seconds = 1377201161)
Half life measurement
The 6.1 day half life isotope emits a 333.02 and a 355.73 keV in coincidence.
| Run Number | Date (Seconds since 1970) | Sec since irradiation | Running Time (sec) | 333.02 Rate | 355.73 rate | Calibration Desc |
| 5838 | August 26, 2013 11:34:58 AM MDT (1377538498) | 337337 | 477 | 22 +/- 4 | 73 +/- 13 | OR, Au Foil 130100-009, only counting with detector 180-3 (no TDC) 8 min 1sec long, 808 Hz, Det B HV OFF, ntuple->Draw("-25.6847+ADC5*0.359504>>(4096,0,4096)") |
| 5852 | August 27, 2013 4:24:43 PM MDT(1377642283) | 441122 | 512 | 17 +/- 3 | 58 +/- 8 | Gold Foil 130100-009, only counting with detector 180-3 (no TDC) 7 min 34 sec long, 716 Hz, Det B HV OFF, ntuple->Draw("-25.6847+ADC5*0.359504>>(4096,0,4096)") |
| 5916 | September 5, 2013 9:14:14 AM MDT (1378394054) | 1192893 | 620 | 7.5 +/- 1 | 35 +/- 4 | Au foil 130100-009, Using only Det 180-2 (Det B warm), 10 min 25 sec long, 388 Hz |
Media:Au196_halfLife_8-22-13Irad.xmgrace.txt