SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
702-9.1, 2014-08-15, 04:36:54, 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=2250, z=2803
primary beam = -1.9nA
QT1 Y defl = -1733 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 195.82502 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98302 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02802 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98932 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99432 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99732 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07487 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05145 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05795 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18758   18927   19645   20422   20436   20652  
Pb204 2   2   1   0   1   2  
Bkgrnd 0   1   1   0   0   2  
Pb206 4510   4482   4363   4356   4328 R 4303  
Pb207 1034   1006   1028 R 1015   959   1007  
Pb208 1858   1838   1812   1764   1789   1755  
U238 4471   4692   4681   4788   5025   5002  
ThO248 43516   43160   42923   42810   43133   42985  
UO254 13490   13459   13283   13452   13549   13617  
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 3.4 0.2 0.2 0.2 0.6 0.2 1.0 1.1 0.9
slope 2.7 -0.0 0.0 -0.3 -0.1 -0.1 0.7 -0.5 0.2
interc 1.9E+4 1.6E+0 1.9E-1 4.5E+3 1.0E+3 1.9E+3 4.4E+3 4.3E+4 1.3E+4
cps 1.0E+4 1.3E-1 6.9E-2 4.4E+2 3.4E+1 1.8E+2 9.5E+2 8.6E+3 6.7E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000141 0.076491 0.411900 10.534303 0.464061 9.117406 7.111826
ratio 0.000122 0.001092 0.004706 0.084955 0.004007 0.058258 0.049758

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00918(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1791 0.0029 1061.7894 16.1  
Pb207/Pb206 0.0765 0.0011 1107.9548 28.3  
Pb207/U235 1.8884 0.0436 1077.0133 15.2  
Pb208/Th232 0.0517 0.0011 1018.5453 22.0  
204 corrected          
Pb206/U238 0.1786 0.0030 1059.5834 16.2  
Pb207/Pb206 0.0745 0.0022 1054.8297 57.8  
Pb207/U235 1.8349 0.0649 1058.0310 23.0  
Pb208/Pb206 0.4078 0.0065      
Pb208/Th232 0.0511 0.0013 1006.4340 24.3  
207 corrected          
Pb206/U238 0.1787 0.0029 1059.7774 16.1  
Pb208/Pb206 0.4082 0.0055      
Pb208/Th232 0.0511 0.0012 1007.4990 22.9  
208 corrected          
Pb206/U238 0.1808 0.0030 1071.5524 16.6  
Pb207/Pb206 0.0852 0.0035 1320.9965 77.5  
Pb207/U235 2.1254 0.0983 1157.0806 31.4  

CONCENTRATIONS
CONCENTRATIONS U:113.2 ppm Th:161.5 ppm Th/U:1.427 ±0.0 Pb204:2.4 ppb sens 16.2