SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-17.1, 2014-08-14, 22:18:34, 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=7986, y=1213, z=3231
primary beam = -1.9nA
QT1 Y defl = -1720 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 195.82550 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98350 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02850 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98919 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99420 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99720 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07411 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05159 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05827 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18867   19300   19917   19956   20538   20861  
Pb204 2   2   1   1   1   1  
Bkgrnd 2   1   0   1   1   1  
Pb206 4938   4938   4858   4783   4859   4720  
Pb207 1271   1164   1146 R 1169   1133   1138  
Pb208 1141   1086   1092   1053   1142   1066  
U238 4588   4629   4767   4842   4872   4962  
ThO248 23931   23627   23623   23657   23538   24257  
UO254 13572   13297 R 13213   13470   13399   13291  
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 0.9 0.1 0.1 0.5 1.1 1.4 0.2 3.6 1.5
slope 2.6 -0.0 -0.0 -0.3 -0.1 -0.0 0.5 0.3 -0.2
interc 1.9E+4 2.0E+0 1.3E+0 5.0E+3 1.2E+3 1.1E+3 4.5E+3 2.4E+4 1.3E+4
cps 1.0E+4 1.3E-1 9.9E-2 4.9E+2 3.9E+1 1.1E+2 9.5E+2 4.8E+3 6.7E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000061 0.080478 0.226416 10.552932 0.511117 5.006968 7.055580
ratio 0.000114 0.001131 0.003544 0.069431 0.004255 0.038816 0.051378

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.01027(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.2004 0.0034 1177.2744 18.0  
Pb207/Pb206 0.0805 0.0011 1208.7328 27.4  
Pb207/U235 2.2233 0.0516 1188.4118 16.1  
Pb208/Th232 0.0575 0.0015 1130.6515 27.8  
204 corrected          
Pb206/U238 0.2002 0.0034 1176.2271 18.1  
Pb207/Pb206 0.0796 0.0021 1187.5837 51.0  
Pb207/U235 2.1974 0.0724 1180.2330 22.7  
Pb208/Pb206 0.2245 0.0054      
Pb208/Th232 0.0570 0.0018 1120.1158 34.1  
207 corrected          
Pb206/U238 0.2001 0.0034 1175.6715 18.1  
Pb208/Pb206 0.2234 0.0046      
Pb208/Th232 0.0567 0.0016 1114.5242 30.9  
208 corrected          
Pb206/U238 0.2013 0.0034 1182.4628 18.2  
Pb207/Pb206 0.0847 0.0024 1308.8866 53.7  
Pb207/U235 2.3515 0.0814 1228.0046 24.4  

CONCENTRATIONS
CONCENTRATIONS U:112.4 ppm Th:88.6 ppm Th/U:0.789 ±0.0 Pb204:1.2 ppb sens 16.5