SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
702-11.1, 2014-08-15, 05:17:29, 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=2113, z=2854
primary beam = -1.9nA
QT1 Y defl = -1745 bits; QT1 Z defl = 400 bits
runtable 2014-08-14 GSWA 0955
duration: 15min 28sec (928sec)


RUN TABLE
# Name AMU AMU Offset Time s Delay s Coll Focus Centering Ref Cent Detector CUP Mode setting
1 Zr2O 195.82360 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98160 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02660 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98761 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99261 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99561 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07339 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04961 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05584 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18261   19016   20150   19919   20497   20915  
Pb204 0   1   1   2   0   2  
Bkgrnd 2   1   1   0   1   0  
Pb206 1915   1901   1882   1849   1816   1832  
Pb207 432   422   445   403   412   437  
Pb208 592   600   589   590   590   603  
U238 2085   2110   2148   2134   2178   2193  
ThO248 14179   14242   14413   14436   14672   14596  
UO254 5857   5824 R 6201   5907   6033   6097  
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 0.6 0.2 0.1 0.1 0.7 0.1 0.1 0.3 3.1
slope 3.4 0.0 -0.0 -0.1 -0.0 0.0 0.1 0.6 0.3
interc 1.8E+4 3.8E-1 1.7E+0 1.9E+3 4.3E+2 5.9E+2 2.1E+3 1.4E+4 5.8E+3
cps 9.9E+3 1.1E-1 7.9E-2 1.9E+2 1.4E+1 5.9E+1 4.3E+2 2.9E+3 3.0E+3
rej1 20150                
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000140 0.075591 0.317889 23.247947 0.437436 6.741062 6.989177
ratio 0.000464 0.001663 0.006125 0.216025 0.005659 0.063767 0.089749

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00895(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1748 0.0050 1038.2519 27.5  
Pb207/Pb206 0.0756 0.0017 1084.2611 43.5  
Pb207/U235 1.8214 0.0698 1053.1797 24.8  
Pb208/Th232 0.0519 0.0020 1023.5304 38.0  
204 corrected          
Pb206/U238 0.1744 0.0052 1036.1054 28.4  
Pb207/Pb206 0.0736 0.0074 1030.6107 189.9  
Pb207/U235 1.7695 0.1907 1034.3403 67.6  
Pb208/Pb206 0.3136 0.0178      
Pb208/Th232 0.0511 0.0034 1007.8660 64.9  
207 corrected          
Pb206/U238 0.1744 0.0050 1036.3214 27.5  
Pb208/Pb206 0.3140 0.0074      
Pb208/Th232 0.0512 0.0021 1009.4428 39.9  
208 corrected          
Pb206/U238 0.1752 0.0051 1040.6115 27.9  
Pb207/Pb206 0.0778 0.0044 1140.9212 107.9  
Pb207/U235 1.8784 0.1248 1073.5013 43.1  

CONCENTRATIONS
CONCENTRATIONS U:50.7 ppm Th:54.2 ppm Th/U:1.069 ±0.0 Pb204:1.1 ppb sens 15.8