SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
BRA-3.1, 2014-08-14, 13:21:34, 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=7980, y=1814, z=2310
primary beam = -1.8nA
QT1 Y defl = -1737 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 195.81675 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97475 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.01975 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98121 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98621 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.98921 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06509 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04149 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.04827 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 19292   19682   20413   20764   21582   21648  
Pb204 2   1   0   2   1   2  
Bkgrnd 0   0   0   0   0   0  
Pb206 17760   17609   17237   16964   16935   16594  
Pb207 3213   3129   3131   2992   3122   3037  
Pb208 1206   1281   1138   1107   1101   1080  
U238 35706   37303   37722   38925   38865   39794  
ThO248 53357   53401   53143   52762   53296   53499  
UO254 105707   105498   104929   105464   105261   106094  
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 1.5 0.2 0.0 0.4 1.2 1.8 2.3 1.6 1.7
slope 3.3 0.0 -0.0 -1.5 -0.2 -0.2 4.0 0.0 0.3
interc 1.9E+4 1.2E+0 -0.0E+0 1.8E+4 3.2E+3 1.3E+3 3.6E+4 5.3E+4 1.1E+5
cps 1.0E+4 1.3E-1 -0.0E+0 1.7E+3 1.0E+2 1.2E+2 7.6E+3 1.1E+4 5.3E+4
rej1             35706    
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000078 0.060296 0.067670 1.364535 0.226415 1.402784 6.946543
ratio 0.000028 0.000527 0.001118 0.006481 0.001012 0.005507 0.025078

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00469(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.0916 0.0008 564.7887 4.6  
Pb207/Pb206 0.0603 0.0005 614.2124 18.8  
Pb207/U235 0.7612 0.0098 574.7247 5.7  
Pb208/Th232 0.0277 0.0005 552.4284 10.5  
204 corrected          
Pb206/U238 0.0915 0.0008 564.1108 4.6  
Pb207/Pb206 0.0592 0.0007 573.1543 24.8  
Pb207/U235 0.7460 0.0113 565.9113 6.5  
Pb208/Pb206 0.0650 0.0015      
Pb208/Th232 0.0266 0.0007 529.9200 13.1  
207 corrected          
Pb206/U238 0.0914 0.0008 563.9640 4.6  
Pb208/Pb206 0.0644 0.0017      
Pb208/Th232 0.0263 0.0008 525.0440 14.8  
208 corrected          
Pb206/U238 0.0916 0.0008 565.1732 4.6  
Pb207/Pb206 0.0609 0.0007 636.9939 26.1  
Pb207/U235 0.7699 0.0121 579.6901 6.9  

CONCENTRATIONS
CONCENTRATIONS U:860.3 ppm Th:192.4 ppm Th/U:0.224 ±0.0 Pb204:5.3 ppb sens 17.0