SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
BRA-5.1, 2014-08-14, 16:50:57, 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=7983, y=1823, z=2349
primary beam = -1.7nA
QT1 Y defl = -1749 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 195.82047 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97847 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02347 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98284 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98784 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99084 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06959 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04543 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05201 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 17721   18346   18565   19113   19614   19861  
Pb204 4   6   1   2   0   0  
Bkgrnd 1   0   2   0   0   6  
Pb206 16970 R 16921   16617   15981   15933   15769 R
Pb207 3043   3103   2917   2847   2916   2871  
Pb208 1278   1112 R 1142   1161   1111   1112  
U238 34109   34985   35112   35678   36261   36701  
ThO248 51942   51017   50237   50037   50408   50504  
UO254 101274   99829   98819   99676   99921   100406  
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 1.0 0.8 1.7 1.6 2.4 0.7 3.1 2.8
slope 2.8 -0.0 0.0 -1.8 -0.3 -0.2 3.2 -0.6 1.5
interc 1.8E+4 5.0E+0 -3.5E-1 1.7E+4 3.1E+3 1.2E+3 3.4E+4 5.1E+4 9.9E+4
cps 9.5E+3 1.9E-1 1.6E-1 1.6E+3 9.9E+1 1.2E+2 7.1E+3 1.0E+4 5.0E+4
rej1               51942 101274
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000021 0.060113 0.070774 1.346917 0.232096 1.432871 7.053116
ratio 0.000024 0.000630 0.001363 0.004955 0.001088 0.005525 0.021545

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00467(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.0910 0.0007 561.7317 4.1  
Pb207/Pb206 0.0601 0.0006 607.6418 22.5  
Pb207/U235 0.7546 0.0104 570.9124 6.0  
Pb208/Th232 0.0285 0.0006 568.9443 12.0  
204 corrected          
Pb206/U238 0.0910 0.0007 561.5541 4.1  
Pb207/Pb206 0.0598 0.0007 596.8956 26.3  
Pb207/U235 0.7507 0.0115 568.6033 6.6  
Pb208/Pb206 0.0701 0.0016      
Pb208/Th232 0.0283 0.0007 563.1124 13.8  
207 corrected          
Pb206/U238 0.0909 0.0007 560.9792 4.2  
Pb208/Pb206 0.0678 0.0021      
Pb208/Th232 0.0273 0.0009 544.2232 17.1  
208 corrected          
Pb206/U238 0.0910 0.0007 561.5049 4.2  
Pb207/Pb206 0.0597 0.0009 593.9076 32.0  
Pb207/U235 0.7496 0.0132 567.9634 7.6  

CONCENTRATIONS
CONCENTRATIONS U:880.4 ppm Th:198.7 ppm Th/U:0.226 ±0.0 Pb204:1.4 ppb sens 16.8