SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
BRA-7.1, 2014-08-14, 21:57:19, 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=1829, z=2413
primary beam = -1.8nA
QT1 Y defl = -1726 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 195.82526 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98326 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02826 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98943 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99443 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99743 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07528 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05215 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05825 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18235   18774   19681   20380   20244   20607  
Pb204 1   2   2   3   1   1  
Bkgrnd 1   1   2   0   1   0  
Pb206 18986   19095 R 18606   18045   18451   17913 R
Pb207 3456   3301   3267   3317 R 3316   3229  
Pb208 1312   1344   1329   1234   1193   1266  
U238 37340   38103   38503   39606   39560   40782  
ThO248 55997   55522   55707   55342   56186   57107  
UO254 110271   110120   110230   110697   111751   111359  
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 0.5 0.2 3.7 1.1 1.7 2.0 2.8 1.4
slope 3.0 -0.0 -0.0 -1.5 -0.2 -0.1 4.2 0.1 2.0
interc 1.8E+4 1.8E+0 1.4E+0 1.9E+4 3.4E+3 1.4E+3 3.7E+4 5.6E+4 1.1E+5
cps 9.8E+3 1.7E-1 8.1E-2 1.9E+3 1.1E+2 1.3E+2 7.7E+3 1.1E+4 5.5E+4
rej1 20380             57107  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000046 0.059702 0.069435 1.272119 0.239207 1.440260 7.140412
ratio 0.000035 0.000558 0.001121 0.007371 0.001545 0.005889 0.023079

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 564.7383 4.9  
Pb207/Pb206 0.0597 0.0006 592.8003 20.1  
Pb207/U235 0.7537 0.0104 570.3534 6.0  
Pb208/Th232 0.0283 0.0005 563.8818 10.7  
204 corrected          
Pb206/U238 0.0915 0.0008 564.3431 4.9  
Pb207/Pb206 0.0590 0.0008 568.6608 28.5  
Pb207/U235 0.7448 0.0127 565.2021 7.3  
Pb208/Pb206 0.0679 0.0017      
Pb208/Th232 0.0276 0.0007 550.8329 14.7  
207 corrected          
Pb206/U238 0.0915 0.0008 564.2731 4.9  
Pb208/Pb206 0.0676 0.0018      
Pb208/Th232 0.0275 0.0008 548.5209 15.3  
208 corrected          
Pb206/U238 0.0916 0.0008 564.7651 4.9  
Pb207/Pb206 0.0597 0.0008 594.4220 27.6  
Pb207/U235 0.7543 0.0126 570.7016 7.2  

CONCENTRATIONS
CONCENTRATIONS U:939.8 ppm Th:211.2 ppm Th/U:0.225 ±0.0 Pb204:3.4 ppb sens 16.6