SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
BRB-8.1, 2014-08-14, 23:52:42, 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=7998, y=1767, z=3858
primary beam = -1.9nA
QT1 Y defl = -1727 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 195.82518 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98318 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02818 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98933 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99434 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99734 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07655 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05255 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05930 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18953   19237   19710   20139 R 20662   21470  
Pb204 3   1   1   0   2   2  
Bkgrnd 0   0   1   1   0   1  
Pb206 18489   18131   17595   17903   17125   17547  
Pb207 3334   3232   3148   3169   3126   3168  
Pb208 1382   1213   1221   1173   1167   1181  
U238 35930   37205   37653   38226   38952   38901  
ThO248 54640   54786   54451   55540   54808   54785  
UO254 107422   107640   106968   108100   108038   108018  
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 1.3 0.4 0.1 3.6 0.9 2.5 3.3 2.9 1.4
slope 3.2 -0.0 0.0 -1.1 -0.2 -0.2 3.8 0.4 1.0
interc 1.9E+4 1.7E+0 9.8E-2 1.8E+4 3.3E+3 1.3E+3 3.6E+4 5.5E+4 1.1E+5
cps 1.0E+4 1.5E-1 5.2E-2 1.8E+3 1.1E+2 1.2E+2 7.5E+3 1.1E+4 5.4E+4
rej1       17125          
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000054 0.059641 0.068947 1.342975 0.238087 1.459196 7.162493
ratio 0.000031 0.000552 0.001325 0.006733 0.001649 0.007020 0.029098

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00464(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.0906 0.0010 558.8919 5.7  
Pb207/Pb206 0.0596 0.0006 590.5647 20.0  
Pb207/U235 0.7448 0.0112 565.1792 6.5  
Pb208/Th232 0.0275 0.0006 548.2089 12.4  
204 corrected          
Pb206/U238 0.0905 0.0010 558.4313 5.7  
Pb207/Pb206 0.0589 0.0007 562.0621 26.8  
Pb207/U235 0.7344 0.0128 559.1472 7.4  
Pb208/Pb206 0.0671 0.0017      
Pb208/Th232 0.0267 0.0008 533.1619 15.0  
207 corrected          
Pb206/U238 0.0905 0.0010 558.3733 5.7  
Pb208/Pb206 0.0669 0.0019      
Pb208/Th232 0.0266 0.0008 531.2655 16.3  
208 corrected          
Pb206/U238 0.0906 0.0010 559.2299 5.7  
Pb207/Pb206 0.0602 0.0008 611.1229 29.6  
Pb207/U235 0.7523 0.0139 569.5815 8.0  

CONCENTRATIONS
CONCENTRATIONS U:892.0 ppm Th:202.6 ppm Th/U:0.227 ±0.0 Pb204:3.7 ppb sens 17.0