SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-7.1, 2014-08-14, 14:18:35, 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=7981, y=1423, z=2495
primary beam = -1.8nA
QT1 Y defl = -1728 bits; QT1 Z defl = 385 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 195.81665 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97465 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.01965 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98012 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98513 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.98813 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06585 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04146 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.04820 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18390   18796   19324   20005   19915   20277  
Pb204 1   3   2   1   2   2  
Bkgrnd 1   1   0   0   0   0  
Pb206 1750   1816   1688   1756   1727   1609  
Pb207 456   452   413   442   369   362  
Pb208 648   594   612   583   512   479  
U238 1671   1724   1822   1702   1683   1675  
ThO248 13537   13074   12188   11658   10884   10929  
UO254 5085   5014   4911   4705   4760   4844  
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 2.3 0.5 0.0 1.9 1.1 1.0 2.2 0.9 2.1
slope 2.5 0.0 -0.0 -0.2 -0.1 -0.2 -0.0 -4.4 -0.4
interc 1.8E+4 1.8E+0 9.8E-1 1.8E+3 4.8E+2 6.8E+2 1.7E+3 1.4E+4 5.1E+3
cps 9.8E+3 1.8E-1 3.0E-2 1.7E+2 1.4E+1 5.8E+1 3.4E+2 2.5E+3 2.5E+3
rej1               10929  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000891 0.080809 0.337021 28.515753 0.502656 7.157609 7.174625
ratio 0.000357 0.002031 0.007348 0.434448 0.009996 0.107663 0.120670

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00977(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1906 0.0074 1124.4213 40.2  
Pb207/Pb206 0.0808 0.0020 1216.8026 48.6  
Pb207/U235 2.1232 0.1041 1156.3889 33.3  
Pb208/Th232 0.0577 0.0029 1134.3040 55.2  
204 corrected          
Pb206/U238 0.1878 0.0074 1109.7015 40.1  
Pb207/Pb206 0.0681 0.0059 870.8001 170.1  
Pb207/U235 1.7631 0.1759 1032.0002 62.6  
Pb208/Pb206 0.3097 0.0150      
Pb208/Th232 0.0523 0.0035 1030.1018 66.7  
207 corrected          
Pb206/U238 0.1896 0.0074 1119.4646 40.1  
Pb208/Pb206 0.3279 0.0090      
Pb208/Th232 0.0559 0.0030 1099.2489 56.5  
208 corrected          
Pb206/U238 0.1903 0.0075 1122.7769 40.5  
Pb207/Pb206 0.0794 0.0057 1182.1974 136.5  
Pb207/U235 2.0830 0.1803 1143.2124 57.7  

CONCENTRATIONS
CONCENTRATIONS U:42.1 ppm Th:46.8 ppm Th/U:1.113 ±0.0 Pb204:6.1 ppb sens 16.9