SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
702-8.1, 2014-08-15, 04:16:56, 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=2288, z=2503
primary beam = -1.9nA
QT1 Y defl = -1757 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 195.82396 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98196 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02696 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98693 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99193 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99493 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07358 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04966 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05621 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18396   19053   19472   20113   20593   20680  
Pb204 1   0   0   1   1   1  
Bkgrnd 0   1   0   1   1   0  
Pb206 3737   3706   3499   3393   3375   3101  
Pb207 821   802   825   760   742   723  
Pb208 2206   2034   1872   1789   1901   1867  
U238 3761   3918   3827   3777   3634   3729  
ThO248 48987   47341   46766   45687   45988   45382  
UO254 11170   11042   10783   10628   10520   10218  
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 0.1 0.2 1.3 0.5 4.0 1.9 2.8 0.2
slope 3.1 0.0 0.0 -0.8 -0.1 -0.2 -0.2 -3.1 -1.2
interc 1.8E+4 3.6E-1 4.2E-1 3.8E+3 8.4E+2 2.0E+3 3.9E+3 4.8E+4 1.1E+4
cps 9.9E+3 6.9E-2 5.0E-2 3.5E+2 2.6E+1 1.9E+2 7.6E+2 9.3E+3 5.4E+3
rej1           2206   48987  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000055 0.075004 0.552404 13.110750 0.458176 12.334121 7.152994
ratio 0.000144 0.001246 0.011133 0.130007 0.005555 0.120523 0.071880

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00895(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1748 0.0041 1038.2373 22.5  
Pb207/Pb206 0.0750 0.0012 1068.6185 33.0  
Pb207/U235 1.8072 0.0549 1048.0692 19.7  
Pb208/Th232 0.0502 0.0017 990.6235 32.8  
204 corrected          
Pb206/U238 0.1746 0.0041 1037.3995 22.6  
Pb207/Pb206 0.0742 0.0026 1047.6996 67.9  
Pb207/U235 1.7870 0.0788 1040.7198 28.3  
Pb208/Pb206 0.5509 0.0123      
Pb208/Th232 0.0501 0.0018 987.2161 34.1  
207 corrected          
Pb206/U238 0.1745 0.0041 1036.9916 22.5  
Pb208/Pb206 0.5502 0.0116      
Pb208/Th232 0.0500 0.0017 985.5572 33.2  
208 corrected          
Pb206/U238 0.1776 0.0044 1054.0596 24.1  
Pb207/Pb206 0.0894 0.0081 1413.0889 164.2  
Pb207/U235 2.1900 0.2123 1177.8810 65.4  

CONCENTRATIONS
CONCENTRATIONS U:91.3 ppm Th:175.4 ppm Th/U:1.922 ±0.0 Pb204:0.7 ppb sens 16.4