SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
702-15.1, 2014-08-15, 09:02:00, set 1 of 1
6 scans, 25 nano seconds dead time, RATIO TO SBM ON, SBM zero 23557, autocenter ON, trim mass offset disabled
data reduction Zircon, BR266, spot x=7985, y=2243, z=2992
primary beam = -2.0nA
QT1 Y defl = -1706 bits; QT1 Z defl = 400 bits
runtable 2014-08-14 GSWA 0955
duration: 15min 27sec (927sec)


RUN TABLE
# Name AMU AMU Offset Time s Delay s Coll Focus Centering Ref Cent Detector CUP Mode setting
1 Zr2O 195.82491 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98291 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02791 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98786 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99286 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99586 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07362 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05051 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05688 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 20413   20899   21540   21585   22182   22422  
Pb204 1   0   0   0   2   2  
Bkgrnd 1   0   0   0   1   0  
Pb206 13493   13628   13219   12923   12857   12816  
Pb207 3044   3127   2818   2966   2836   2833  
Pb208 6063   5954   5725   5772   5624   5534  
U238 14078   14775   14879   15066   15115   15306  
ThO248 142539   142670   141278   141151   142040   144294  
UO254 41562   41059   40759   41596   41399   41533  
I - insufficient counts to center; C - fail to center; R - failed F test, passed by rejection F - failed F test, accepts all counts, S - re-measured

LINEAR REGRESSION (reject at 2 x cnt stat)
  Zr2O Pb204 Bkgrnd Pb206 Pb207 Pb208 U238 ThO248 UO254
F 1.0 0.3 0.2 1.6 3.3 0.6 2.7 3.1 3.2
slope 2.6 0.0 -0.0 -1.1 -0.3 -0.7 1.4 -1.6 0.3
interc 2.0E+4 -1.8E-2 4.9E-1 1.4E+4 3.1E+3 6.1E+3 1.4E+4 1.4E+5 4.1E+4
cps 1.1E+4 9.1E-2 3.3E-2 1.3E+3 9.8E+1 5.8E+2 3.0E+3 2.8E+4 2.1E+4
rej1               144294  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000044 0.074599 0.441596 3.657878 0.445145 9.603212 6.983787
ratio 0.000039 0.001072 0.003104 0.022501 0.003157 0.055476 0.045613

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00913(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1781 0.0026 1056.6313 14.5  
Pb207/Pb206 0.0746 0.0011 1057.7087 28.7  
Pb207/U235 1.8320 0.0402 1056.9827 14.3  
Pb208/Th232 0.0516 0.0010 1016.7862 18.4  
204 corrected          
Pb206/U238 0.1780 0.0026 1055.9438 14.5  
Pb207/Pb206 0.0740 0.0012 1040.7151 33.2  
Pb207/U235 1.8153 0.0429 1050.9915 15.4  
Pb208/Pb206 0.4403 0.0034      
Pb208/Th232 0.0514 0.0010 1013.2560 18.7  
207 corrected          
Pb206/U238 0.1781 0.0027 1056.5595 14.5  
Pb208/Pb206 0.4415 0.0041      
Pb208/Th232 0.0516 0.0010 1016.4175 19.5  
208 corrected          
Pb206/U238 0.1799 0.0027 1066.4082 14.9  
Pb207/Pb206 0.0834 0.0030 1278.9962 67.5  
Pb207/U235 2.0691 0.0832 1138.6312 27.2  

CONCENTRATIONS
CONCENTRATIONS U:322.1 ppm Th:491.0 ppm Th/U:1.524 ±0.0 Pb204:2.2 ppb sens 16.7