SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
702-12.1, 2014-08-15, 08:02:16, 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=7985, y=2181, z=2879
primary beam = -2.0nA
QT1 Y defl = -1721 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 195.82470 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98269 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02769 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98778 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99279 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99579 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07416 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05033 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05592 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 20022   20780   21245   21311   21844   22278  
Pb204 4   1   1   0   0   1  
Bkgrnd 3   0   1   2   1   0  
Pb206 11443   11192   11162   11278   11560   11969  
Pb207 2542   2533   2427   2472   2647   2710  
Pb208 4779   4735   4643   4719   4914   5148  
U238 11604   12193   12461   12737   13054   14060  
ThO248 111875   111931   115155   117586   120692   128030  
UO254 34279   34222   35276   36168   37127   38799  
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 0.8 0.3 2.3 3.5 4.2 4.1 1.6 1.8
slope 2.7 -0.0 -0.0 1.3 0.2 0.5 2.8 17.3 7.2
interc 2.0E+4 2.6E+0 2.1E+0 1.1E+4 2.4E+3 4.6E+3 1.1E+4 1.1E+5 3.2E+4
cps 1.1E+4 1.0E-1 1.1E-1 1.1E+3 8.5E+1 4.8E+2 2.5E+3 2.3E+4 1.8E+4
rej1       11443       128030 34279
rej2               111875  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- -0.000008 0.074900 0.423603 4.274009 0.453189 9.188594 7.023894
ratio -Inf 0.001209 0.005637 0.034578 0.004226 0.068877 0.055433

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00919(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1793 0.0033 1062.9408 17.9  
Pb207/Pb206 0.0749 0.0012 1065.8310 32.1  
Pb207/U235 1.8513 0.0479 1063.8880 16.9  
Pb208/Th232 0.0523 0.0013 1030.2321 25.2  
204 corrected          
Pb206/U238 0.1793 Inf 1063.0595 Inf  
Pb207/Pb206 0.0750 Inf 1068.7124 NaN  
Pb207/U235 1.8542 Inf 1064.9131 Inf  
Pb208/Pb206 0.4238 Inf      
Pb208/Th232 0.0523 Inf 1030.8722 Inf  
207 corrected          
Pb206/U238 0.1792 0.0033 1062.8268 18.0  
Pb208/Pb206 0.4234 0.0064      
Pb208/Th232 0.0523 0.0014 1029.6176 26.3  
208 corrected          
Pb206/U238 0.1806 0.0034 1070.4897 18.5  
Pb207/Pb206 0.0817 0.0041 1237.9597 96.3  
Pb207/U235 2.0345 0.1144 1127.1307 37.6  

CONCENTRATIONS
CONCENTRATIONS U:276.7 ppm Th:401.8 ppm Th/U:1.452 ±0.0 Pb204:-0.3 ppb sens 16.6