SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-24.1, 2014-08-15, 03:17:16, 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=7996, y=1411, z=3532
primary beam = -1.9nA
QT1 Y defl = -1769 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 195.82432 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98232 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02732 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98784 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99284 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99584 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07374 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04945 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05608 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18448   19062   19786   20350   20749   21016  
Pb204 0   5   1   2   0   1  
Bkgrnd 1   1   0   0   0   1  
Pb206 6985   7065   6890   6899   6776   6778  
Pb207 1684   1700   1676   1594   1621   1609  
Pb208 1707   1751   1698   1730   1679   1654  
U238 6557   6866   7004   7115   7022   6984  
ThO248 36953   36754   36679   36354   36668   36467  
UO254 19586   19572   19721   19874   19696   19623  
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 1.5 0.6 0.2 0.5 0.5 0.5 3.2 0.7 0.7
slope 3.4 -0.0 -0.0 -0.4 -0.1 -0.1 0.5 -0.6 0.1
interc 1.9E+4 2.2E+0 7.4E-1 7.1E+3 1.7E+3 1.7E+3 6.7E+3 3.7E+4 2.0E+4
cps 1.0E+4 1.4E-1 4.9E-2 6.9E+2 5.5E+1 1.7E+2 1.4E+3 7.3E+3 9.8E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000138 0.079679 0.247379 7.277049 0.500577 5.324030 7.134499
ratio 0.000080 0.000892 0.002734 0.069284 0.005060 0.048371 0.066342

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00983(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1919 0.0041 1131.7397 21.9  
Pb207/Pb206 0.0797 0.0009 1189.0528 22.0  
Pb207/U235 2.1084 0.0530 1151.5549 17.2  
Pb208/Th232 0.0571 0.0016 1122.6970 29.7  
204 corrected          
Pb206/U238 0.1915 0.0041 1129.4493 21.9  
Pb207/Pb206 0.0777 0.0015 1139.9411 38.4  
Pb207/U235 2.0523 0.0628 1133.0452 20.7  
Pb208/Pb206 0.2430 0.0040      
Pb208/Th232 0.0560 0.0017 1100.9799 31.8  
207 corrected          
Pb206/U238 0.1914 0.0041 1128.9705 21.9  
Pb208/Pb206 0.2421 0.0036      
Pb208/Th232 0.0557 0.0016 1096.4389 30.8  
208 corrected          
Pb206/U238 0.1921 0.0041 1132.8142 22.1  
Pb207/Pb206 0.0806 0.0023 1211.4942 54.0  
Pb207/U235 2.1347 0.0794 1160.1252 25.4  

CONCENTRATIONS
CONCENTRATIONS U:164.2 ppm Th:136.5 ppm Th/U:0.831 ±0.0 Pb204:3.7 ppb sens 16.5