SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
BRA-13.1, 2014-08-15, 10:01:25, 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=1737, z=2441
primary beam = -2.0nA
QT1 Y defl = -1724 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 195.82014 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97814 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02314 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98433 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98934 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99234 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06983 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04642 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05234 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 20180   20770   21599   22234   22158   22858  
Pb204 2   2   2   0   3   1  
Bkgrnd 1   0   0   0   0   0  
Pb206 19072   19080   19092   18426   18683 R 18345  
Pb207 3542   3341   3397   3256   3255   3284  
Pb208 1308   1284   1225   1187   1206   1247  
U238 38345   39349   40413   40695   41220   41746  
ThO248 57028   56683   57331   57235   57407   58021  
UO254 113024   114218   114146   113861   116694   116331 R
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 3.1 0.2 0.1 2.2 1.5 1.2 2.1 1.2 2.7
slope 3.4 -0.0 -0.0 -1.0 -0.3 -0.1 4.3 1.3 4.7
interc 2.0E+4 2.0E+0 5.7E-1 1.9E+4 3.5E+3 1.3E+3 3.8E+4 5.7E+4 1.1E+5
cps 1.1E+4 1.6E-1 1.5E-2 1.9E+3 1.1E+2 1.2E+2 8.0E+3 1.1E+4 5.7E+4
rej1                 113861
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000079 0.059504 0.066429 1.361252 0.234721 1.428920 7.155368
ratio 0.000029 0.000582 0.000900 0.007768 0.001251 0.005024 0.025574

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00458(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.0895 0.0008 552.3725 4.7  
Pb207/Pb206 0.0595 0.0006 585.5756 21.1  
Pb207/U235 0.7340 0.0103 558.9008 6.0  
Pb208/Th232 0.0267 0.0005 532.6096 8.9  
204 corrected          
Pb206/U238 0.0894 0.0008 551.6999 4.7  
Pb207/Pb206 0.0584 0.0007 543.1489 27.4  
Pb207/U235 0.7189 0.0118 550.0356 6.9  
Pb208/Pb206 0.0637 0.0014      
Pb208/Th232 0.0256 0.0006 510.1929 12.1  
207 corrected          
Pb206/U238 0.0894 0.0008 551.8339 4.7  
Pb208/Pb206 0.0642 0.0017      
Pb208/Th232 0.0258 0.0007 514.6604 14.4  
208 corrected          
Pb206/U238 0.0896 0.0008 552.9850 4.7  
Pb207/Pb206 0.0605 0.0007 623.1627 25.6  
Pb207/U235 0.7477 0.0118 566.9077 6.8  

CONCENTRATIONS
CONCENTRATIONS U:879.4 ppm Th:195.7 ppm Th/U:0.223 ±0.0 Pb204:5.4 ppb sens 17.6