SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-15.1, 2014-08-14, 18:07:37, 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=1287, z=3138
primary beam = -1.8nA
QT1 Y defl = -1723 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 195.82073 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97873 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02373 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98438 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98939 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99239 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06995 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04735 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05331 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 17848   18531   18936   19818   20181   20311  
Pb204 1   2   0   0   1   2  
Bkgrnd 2   1   0   1   0   1  
Pb206 2504   2466   2422   2359   2272   2263 R
Pb207 620   643   553   599   583 R 551  
Pb208 1103   1047   984   917   986   953  
U238 2340   2493   2369   2545   2501   2479  
ThO248 22200   21414   21580   21313   21859   21304  
UO254 6739   6766   6829   6806   6718   6738  
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 2.4 0.2 0.2 0.2 1.5 2.1 2.2 3.3 0.3
slope 3.4 0.0 -0.0 -0.3 -0.1 -0.2 0.2 0.0 -0.0
interc 1.8E+4 8.5E-1 1.4E+0 2.5E+3 6.3E+2 1.1E+3 2.4E+3 2.1E+4 6.8E+3
cps 9.7E+3 1.0E-1 8.1E-2 2.4E+2 2.0E+1 1.0E+2 4.9E+2 4.3E+3 3.4E+3
rej1               22200  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000086 0.082785 0.422732 19.877237 0.487301 8.794831 6.926024
ratio 0.000286 0.001832 0.008696 0.258370 0.007199 0.115934 0.091048

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.01016(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1982 0.0060 1165.8644 32.1  
Pb207/Pb206 0.0828 0.0018 1264.1509 42.6  
Pb207/U235 2.2628 0.0895 1200.7780 27.5  
Pb208/Th232 0.0596 0.0024 1170.7711 46.6  
204 corrected          
Pb206/U238 0.1980 0.0060 1164.3920 32.4  
Pb207/Pb206 0.0816 0.0048 1235.2096 111.0  
Pb207/U235 2.2265 0.1546 1189.4213 47.5  
Pb208/Pb206 0.4202 0.0136      
Pb208/Th232 0.0592 0.0029 1162.4917 54.3  
207 corrected          
Pb206/U238 0.1973 0.0060 1160.9192 32.0  
Pb208/Pb206 0.4143 0.0099      
Pb208/Th232 0.0582 0.0025 1142.9576 47.5  
208 corrected          
Pb206/U238 0.1980 0.0061 1164.7886 32.8  
Pb207/Pb206 0.0819 0.0065 1243.0656 148.4  
Pb207/U235 2.2363 0.1987 1192.4922 60.5  

CONCENTRATIONS
CONCENTRATIONS U:58.9 ppm Th:82.8 ppm Th/U:1.405 ±0.0 Pb204:0.9 ppb sens 16.4