SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
OGC-2.1, 2014-08-14, 15:15:51, 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=1798, z=2770
primary beam = -1.8nA
QT1 Y defl = -1689 bits; QT1 Z defl = 385 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 195.81830 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97629 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02129 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98239 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98739 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99039 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06644 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04329 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05049 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18809   19019   19300   19818   20555   20874  
Pb204 3   2   2   1   2   0  
Bkgrnd 1   1   4   0   1   0  
Pb206 40107   39888   39203   38565   38403   37832  
Pb207 36326   36126   35144   34769   34218   34098  
Pb208 13082   12957   12670   12765   12473   12328  
U238 10446   10808   11128   11467   11609   11911  
ThO248 90038   90121   90102   91265   90939   92088  
UO254 31194   31106   30990   31051   31165   31669  
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 1.6 0.2 0.7 0.6 1.5 0.6 0.4 1.8 1.6
slope 2.9 -0.0 -0.0 -3.1 -3.2 -1.0 1.9 2.6 0.5
interc 1.9E+4 2.9E+0 1.9E+0 4.0E+4 3.7E+4 1.3E+4 1.0E+4 8.9E+4 3.1E+4
cps 9.9E+3 1.6E-1 1.1E-1 3.9E+3 1.2E+3 1.3E+3 2.2E+3 1.8E+4 1.6E+4
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000011 0.300738 0.327065 4.471111 1.756218 8.154034 7.012738
ratio 0.000015 0.001005 0.001364 0.023799 0.007680 0.034800 0.033870

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.03571(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.6969 0.0074 3408.8668 28.0  
Pb207/Pb206 0.3007 0.0010 3474.0281 5.2  
Pb207/U235 28.8973 0.3326 3450.0359 11.2  
Pb208/Th232 0.1767 0.0023 3288.0456 39.7  
204 corrected          
Pb206/U238 0.6968 0.0074 3408.4032 28.0  
Pb207/Pb206 0.3006 0.0010 3473.4318 5.3  
Pb207/U235 28.8811 0.3336 3449.4861 11.3  
Pb208/Pb206 0.3267 0.0015      
Pb208/Th232 0.1764 0.0023 3284.4246 40.0  
207 corrected          
Pb206/U238 0.6840 0.0073 3359.7448 28.0  
Pb208/Pb206 0.2913 0.0037      
Pb208/Th232 0.1544 0.0027 2902.2108 48.1  
208 corrected          
Pb206/U238 0.7017 0.0075 3427.1525 28.4  
Pb207/Pb206 0.3053 0.0017 3497.2159 8.6  
Pb207/U235 29.5365 0.3740 3471.5165 12.4  

CONCENTRATIONS
CONCENTRATIONS U:264.2 ppm Th:340.9 ppm Th/U:1.290 ±0.0 Pb204:1.7 ppb sens 16.9