SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
702-6.1, 2014-08-15, 00:54:25, 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=2259, z=2680
primary beam = -1.9nA
QT1 Y defl = -1736 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 195.82539 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98339 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02839 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98827 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99327 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99627 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07512 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05174 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05887 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 19009   19708   20897   21627   22382   22682  
Pb204 0   2   2   0   0   0  
Bkgrnd 2   2   0   0   1   0  
Pb206 3708   3478   3491   3418   3264   3172  
Pb207 847   762   737   777   703   759  
Pb208 1543   1577   1624   1549   1459   1486  
U238 3881   3947   4069   4106   3996   3954  
ThO248 39367   39081   38825   38045   37282   37257 R
UO254 11362   11065   10795   11069   10695   11005 R
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 3.0 0.3 0.2 0.9 2.2 1.7 1.9 1.4 4.0
slope 5.0 -0.0 -0.0 -0.6 -0.1 -0.1 0.1 -3.1 -0.5
interc 1.9E+4 1.3E+0 1.9E+0 3.7E+3 8.2E+2 1.6E+3 3.9E+3 4.0E+4 1.1E+4
cps 1.1E+4 6.1E-2 7.9E-2 3.4E+2 2.6E+1 1.5E+2 8.0E+2 7.7E+3 5.5E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- -0.000050 0.074459 0.451487 13.351317 0.429455 9.674842 6.927291
ratio -0.000151 0.001720 0.006911 0.135232 0.004854 0.089307 0.082040

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 0.1746 0.0046 1037.6518 25.1  
Pb207/Pb206 0.0745 0.0017 1053.9220 45.9  
Pb207/U235 1.7930 0.0665 1042.9028 23.9  
Pb208/Th232 0.0510 0.0017 1005.6562 33.2  
204 corrected          
Pb206/U238 0.1748 0.0046 1038.4231 25.2  
Pb207/Pb206 0.0752 0.0029 1073.1057 75.5  
Pb207/U235 1.8116 0.0893 1049.6564 31.8  
Pb208/Pb206 0.4529 0.0088      
Pb208/Th232 0.0512 0.0018 1009.5529 35.5  
207 corrected          
Pb206/U238 0.1745 0.0046 1037.0365 25.2  
Pb208/Pb206 0.4503 0.0082      
Pb208/Th232 0.0509 0.0018 1002.5471 34.5  
208 corrected          
Pb206/U238 0.1761 0.0047 1045.6615 25.8  
Pb207/Pb206 0.0818 0.0056 1241.1400 129.3  
Pb207/U235 1.9866 0.1529 1110.9768 50.7  

CONCENTRATIONS
CONCENTRATIONS U:87.8 ppm Th:135.7 ppm Th/U:1.546 ±0.0 Pb204:-0.7 ppb sens 16.9