SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
702-13.1, 2014-08-15, 08:22:00, 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=2171, z=2929
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 195.82368 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98168 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02668 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98809 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99309 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99609 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07323 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04961 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05686 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 19985   20568   21710   22161   22254   22547  
Pb204 3   0   1   0   1   1  
Bkgrnd 0   0   0   1   1   1  
Pb206 1304   1252   1171   1141   1117   1024  
Pb207 287   278 R 247   248   232   281 R
Pb208 394   382   385   285   276   312  
U238 1361   1336   1293   1317   1237   1311  
ThO248 8849   8343   8097   7819   7445   7420  
UO254 3847   3616   3580   3521   3412   3484  
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 4.2 0.3 0.0 0.3 2.1 3.9 1.0 2.0 1.7
slope 3.5 -0.0 0.0 -0.3 -0.0 -0.2 -0.1 -1.9 -0.5
interc 2.0E+4 1.6E+0 -2.2E-1 1.3E+3 2.8E+2 4.2E+2 1.4E+3 9.0E+3 3.8E+3
cps 1.1E+4 9.5E-2 5.3E-2 1.2E+2 8.8E+0 3.5E+1 2.6E+2 1.6E+3 1.8E+3
rej1 21710                
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000354 0.074553 0.296063 41.076566 0.444249 6.192013 6.877545
ratio 0.000354 0.002859 0.013429 0.519489 0.007304 0.080439 0.099235

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00939(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1833 0.0061 1084.8904 33.1  
Pb207/Pb206 0.0746 0.0029 1056.4790 75.3  
Pb207/U235 1.8840 0.1013 1075.4880 35.1  
Pb208/Th232 0.0545 0.0032 1073.4435 62.1  
204 corrected          
Pb206/U238 0.1822 0.0061 1079.2268 33.4  
Pb207/Pb206 0.0695 0.0062 913.4442 173.1  
Pb207/U235 1.7462 0.1729 1025.7746 62.0  
Pb208/Pb206 0.2850 0.0186      
Pb208/Th232 0.0522 0.0040 1028.7800 76.1  
207 corrected          
Pb206/U238 0.1835 0.0061 1085.8461 33.3  
Pb208/Pb206 0.2979 0.0152      
Pb208/Th232 0.0549 0.0035 1080.9746 67.4  
208 corrected          
Pb206/U238 0.1836 0.0063 1086.5685 34.0  
Pb207/Pb206 0.0760 0.0079 1096.1746 193.9  
Pb207/U235 1.9249 0.2169 1089.7705 72.6  

CONCENTRATIONS
CONCENTRATIONS U:28.4 ppm Th:28.2 ppm Th/U:0.995 ±0.0 Pb204:1.6 ppb sens 16.5