SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
BRA-9.1, 2014-08-15, 01:54:14, 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=7980, y=1723, z=2438
primary beam = -1.9nA
QT1 Y defl = -1733 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 195.82460 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98260 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02760 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98945 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99446 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99746 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07515 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05170 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05819 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18672   19132   20031   20252   20634   21042  
Pb204 3   0   0   1   1   0  
Bkgrnd 3   1   0   2   0   0  
Pb206 18571   18026   17866   17751   17594   17426  
Pb207 3290   3199   3183   3128   3079   3023 R
Pb208 1282   1245   1238   1173   1198   1288  
U238 35509   36268   36993   37791   37846   39198  
ThO248 53883   53447   53573   53727   53624   54093  
UO254 106193   106014   107067   106453   106551   107492  
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 1.7 0.3 0.4 1.0 0.1 2.0 1.9 1.1 1.7
slope 3.1 -0.0 -0.0 -1.3 -0.3 -0.0 4.5 0.3 1.4
interc 1.9E+4 1.7E+0 2.3E+0 1.8E+4 3.3E+3 1.3E+3 3.5E+4 5.4E+4 1.1E+5
cps 1.0E+4 7.6E-2 9.4E-2 1.8E+3 1.1E+2 1.2E+2 7.4E+3 1.1E+4 5.3E+4
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- -0.000010 0.058851 0.069257 1.359176 0.241722 1.452306 7.201051
ratio -0.000034 0.000466 0.001159 0.006453 0.001032 0.004991 0.024138

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00466(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.0910 0.0007 561.2591 4.3  
Pb207/Pb206 0.0589 0.0005 561.5872 17.2  
Pb207/U235 0.7381 0.0088 561.3240 5.1  
Pb208/Th232 0.0280 0.0005 557.9255 10.5  
204 corrected          
Pb206/U238 0.0910 0.0007 561.3462 4.3  
Pb207/Pb206 0.0590 0.0007 566.9963 25.5  
Pb207/U235 0.7401 0.0111 562.4656 6.5  
Pb208/Pb206 0.0696 0.0017      
Pb208/Th232 0.0281 0.0007 560.7953 14.2  
207 corrected          
Pb206/U238 0.0910 0.0007 561.2552 4.3  
Pb208/Pb206 0.0692 0.0016      
Pb208/Th232 0.0280 0.0007 557.7979 13.9  
208 corrected          
Pb206/U238 0.0910 0.0007 561.3636 4.3  
Pb207/Pb206 0.0590 0.0007 568.0709 26.0  
Pb207/U235 0.7405 0.0113 562.6928 6.6  

CONCENTRATIONS
CONCENTRATIONS U:884.5 ppm Th:199.1 ppm Th/U:0.225 ±0.0 Pb204:-0.7 ppb sens 17.0