SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
702-5.1, 2014-08-15, 00:34:51, 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=2179, z=2675
primary beam = -1.9nA
QT1 Y defl = -1730 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 195.82549 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98349 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02849 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98835 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99335 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99635 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07458 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05140 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05799 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18833   19657   20397   21247   21355   21653  
Pb204 1   2   1   0   2   0  
Bkgrnd 1   1   1   1   1   1  
Pb206 5469   5033   4413   3930   4025   4420  
Pb207 1264   1089   1014   858   901   1006  
Pb208 2573   2231   1732   1599   1798   2140  
U238 5422   5062   4722   4461   4776   5163  
ThO248 59872   49646   41310   37861   46244   52539  
UO254 15824   14517   13007   12202   13632   15070  
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 2.3 0.3 0.0 39.3 2.2 63.6 26.6 1514.6 152.2
slope 3.6 -0.0 -0.0 -1.6 -0.6 -0.7 -0.4 -9.4 -1.3
interc 1.9E+4 1.5E+0 1.0E+0 5.3E+3 1.3E+3 2.3E+3 5.2E+3 5.3E+4 1.5E+4
cps 1.0E+4 9.6E-2 1.0E-1 4.6E+2 3.4E+1 2.0E+2 9.9E+2 9.7E+3 7.1E+3
rej1 21247       1006        
rej2         858        

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- -0.000009 0.073563 0.448987 10.376860 0.458567 9.802778 7.134188
ratio -Inf 0.003127 0.036797 0.314330 0.022180 0.769831 0.371027

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00901(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1758 0.0202 1044.1204 109.6  
Pb207/Pb206 0.0736 0.0031 1029.5088 83.6  
Pb207/U235 1.7834 0.2269 1039.4073 79.6  
Pb208/Th232 0.0516 0.0087 1016.5530 167.4  
204 corrected          
Pb206/U238 0.1758 Inf 1044.2549 Inf  
Pb207/Pb206 0.0737 Inf 1032.9103 NaN  
Pb207/U235 1.7866 Inf 1040.5933 Inf  
Pb208/Pb206 0.4492 Inf      
Pb208/Th232 0.0516 Inf 1017.2395 Inf  
207 corrected          
Pb206/U238 0.1759 0.0202 1044.7058 109.7  
Pb208/Pb206 0.4501 0.0376      
Pb208/Th232 0.0517 0.0088 1019.5412 168.7  
208 corrected          
Pb206/U238 0.1771 0.0211 1050.9321 114.5  
Pb207/Pb206 0.0798 0.0312 1192.0270 623.1  
Pb207/U235 1.9482 0.8225 1097.8325 249.8  

CONCENTRATIONS
CONCENTRATIONS U:115.1 ppm Th:176.2 ppm Th/U:1.530 ±0.1 Pb204:-0.2 ppb sens 16.9