SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
BRB-12.1, 2014-08-15, 07:20:09, 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=1859, z=3742
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 195.82383 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98183 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02683 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98735 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99235 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99535 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07349 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05044 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05647 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 19986   20272   21261   21705   22146 R 22164  
Pb204 2   1   2   3   3   0  
Bkgrnd 0   3   0   1   1   1  
Pb206 20415   20225   19446   19356 R 19185   18962  
Pb207 3638 R 3506   3374   3425   3417   3404  
Pb208 1384   1398   1353   1339   1322 R 1290  
U238 40071   41545   42186   42710   42956   43510  
ThO248 60264   59906   59539   60925   60162   61013  
UO254 118404 R 118397   118057   119677   118562   119717  
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 3.4 0.5 0.3 1.9 1.4 0.1 3.7 3.3 3.1
slope 3.2 -0.0 -0.0 -1.9 -0.3 -0.1 4.1 0.9 1.6
interc 2.0E+4 2.1E+0 1.0E+0 2.0E+4 3.6E+3 1.4E+3 4.0E+4 6.0E+4 1.2E+5
cps 1.1E+4 1.8E-1 1.0E-1 2.0E+3 1.2E+2 1.4E+2 8.4E+3 1.2E+4 5.9E+4
rej1               59539  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000042 0.058909 0.069028 1.277004 0.233946 1.440824 7.080469
ratio 0.000034 0.000547 0.000818 0.008231 0.001306 0.007036 0.030937

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00467(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.0911 0.0009 561.8383 5.6  
Pb207/Pb206 0.0589 0.0005 563.7300 20.1  
Pb207/U235 0.7397 0.0109 562.2130 6.3  
Pb208/Th232 0.0278 0.0005 553.8326 9.3  
204 corrected          
Pb206/U238 0.0910 0.0009 561.4809 5.6  
Pb207/Pb206 0.0583 0.0008 541.3876 28.2  
Pb207/U235 0.7317 0.0129 557.5214 7.5  
Pb208/Pb206 0.0676 0.0015      
Pb208/Th232 0.0272 0.0007 542.1167 13.4  
207 corrected          
Pb206/U238 0.0911 0.0009 561.8020 5.6  
Pb208/Pb206 0.0689 0.0016      
Pb208/Th232 0.0277 0.0007 552.6454 14.2  
208 corrected          
Pb206/U238 0.0911 0.0009 562.0904 5.6  
Pb207/Pb206 0.0593 0.0007 579.2958 25.0  
Pb207/U235 0.7453 0.0123 565.5115 7.1  

CONCENTRATIONS
CONCENTRATIONS U:931.0 ppm Th:210.7 ppm Th/U:0.226 ±0.0 Pb204:3.0 ppb sens 17.2