SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
702-10.1, 2014-08-15, 04:57:22, 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=2193, z=2838
primary beam = -1.9nA
QT1 Y defl = -1739 bits; QT1 Z defl = 400 bits
runtable 2014-08-14 GSWA 0955
duration: 15min 28sec (928sec)


RUN TABLE
# Name AMU AMU Offset Time s Delay s Coll Focus Centering Ref Cent Detector CUP Mode setting
1 Zr2O 195.82397 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98197 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02697 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98757 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99257 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99557 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07341 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04967 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05708 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18508 R 19088   19612   20172   20353   20607  
Pb204 2   1   0   0   0   0  
Bkgrnd 2   0   2   0   1   0  
Pb206 2235   2314   2347   2303   2334   2317  
Pb207 522   544   556   531   552   547  
Pb208 1121   1215   1195   1284   1254   1281  
U238 2242   2465   2492   2579   2541   2753  
ThO248 26752   28909   28791   29941   29535   31243  
UO254 6921   7121   7010   7253   7412   7668  
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 0.0 0.2 0.6 0.3 1.0 2.2 1.9 1.6
slope 2.8 -0.0 -0.0 0.1 0.0 0.2 0.5 5.9 0.9
interc 1.9E+4 1.5E+0 1.6E+0 2.3E+3 5.3E+2 1.1E+3 2.2E+3 2.6E+4 6.7E+3
cps 9.9E+3 4.1E-2 8.0E-2 2.3E+2 1.8E+1 1.2E+2 5.0E+2 5.7E+3 3.6E+3
rej1               28909  
rej2               29535  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- -0.000168 0.077870 0.526650 20.035907 0.465757 11.588507 7.216091
ratio -0.000237 0.001520 0.007607 0.250203 0.006834 0.143626 0.096625

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00894(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1745 0.0053 1037.1313 29.2  
Pb207/Pb206 0.0779 0.0015 1143.5474 38.3  
Pb207/U235 1.8741 0.0717 1071.9737 25.0  
Pb208/Th232 0.0513 0.0020 1010.4303 37.8  
204 corrected          
Pb206/U238 0.1750 0.0054 1039.7001 29.5  
Pb207/Pb206 0.0802 0.0040 1202.7433 94.3  
Pb207/U235 1.9362 0.1187 1093.6728 40.3  
Pb208/Pb206 0.5312 0.0115      
Pb208/Th232 0.0518 0.0022 1021.6123 41.6  
207 corrected          
Pb206/U238 0.1738 0.0053 1032.8848 29.1  
Pb208/Pb206 0.5191 0.0086      
Pb208/Th232 0.0503 0.0020 991.9414 38.0  
208 corrected          
Pb206/U238 0.1760 0.0055 1045.2311 30.2  
Pb207/Pb206 0.0853 0.0073 1322.0272 156.6  
Pb207/U235 2.0699 0.1953 1138.9040 62.6  

CONCENTRATIONS
CONCENTRATIONS U:60.1 ppm Th:107.7 ppm Th/U:1.793 ±0.0 Pb204:-1.5 ppb sens 16.6