SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
702-7.1, 2014-08-15, 01:14:29, 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=2285, z=2640
primary beam = -1.9nA
QT1 Y defl = -1739 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 195.82524 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98324 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02824 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98938 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99439 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99739 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07419 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05122 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05826 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18604   19091   20073   20726   20387   20724  
Pb204 2   0   1   1   1   2  
Bkgrnd 0   0   0   1   1   0  
Pb206 5932   5816   5787   5771   5598   5415  
Pb207 1327   1325   1301   1291   1303   1201  
Pb208 2834   2739   2829   2851   2700   2594  
U238 6141   6516   6759   6769   6784   6551  
ThO248 67490   67994   68889   67049   66476   64469  
UO254 17957   18327   18688   18294   18270   17726  
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 0.3 0.2 0.2 0.8 0.7 2.4 3.4 2.0 3.9
slope 2.8 0.0 0.0 -0.6 -0.1 -0.2 0.1 -1.9 -1.1
interc 1.9E+4 9.4E-1 1.1E-2 6.0E+3 1.4E+3 2.9E+3 6.6E+3 6.8E+4 1.9E+4
cps 9.9E+3 1.2E-1 3.5E-2 5.7E+2 4.3E+1 2.8E+2 1.3E+3 1.3E+4 9.2E+3
rej1 20726           6141 68889 17957
rej2 20073             64469  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000147 0.075372 0.484032 7.444149 0.429085 10.081715 6.913789
ratio 0.000088 0.000948 0.006337 0.072286 0.004603 0.096124 0.076140

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00898(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1752 0.0043 1040.5681 23.5  
Pb207/Pb206 0.0754 0.0009 1078.4397 25.0  
Pb207/U235 1.8205 0.0526 1052.8591 18.8  
Pb208/Th232 0.0526 0.0016 1035.4310 31.6  
204 corrected          
Pb206/U238 0.1748 0.0043 1038.3144 23.5  
Pb207/Pb206 0.0733 0.0017 1021.9405 45.1  
Pb207/U235 1.7660 0.0625 1033.0558 22.7  
Pb208/Pb206 0.4799 0.0071      
Pb208/Th232 0.0520 0.0017 1024.5306 32.1  
207 corrected          
Pb206/U238 0.1749 0.0043 1038.9581 23.5  
Pb208/Pb206 0.4811 0.0068      
Pb208/Th232 0.0522 0.0017 1027.6441 31.9  
208 corrected          
Pb206/U238 0.1754 0.0044 1041.9271 24.1  
Pb207/Pb206 0.0766 0.0053 1111.4206 133.4  
Pb207/U235 1.8533 0.1428 1064.6192 49.6  

CONCENTRATIONS
CONCENTRATIONS U:157.2 ppm Th:253.6 ppm Th/U:1.613 ±0.0 Pb204:3.5 ppb sens 15.7