SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-13.1, 2014-08-14, 17:15:16, 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=7981, y=1493, z=2935
primary beam = -1.7nA
QT1 Y defl = -1710 bits; QT1 Z defl = 400 bits
runtable 2014-08-14 GSWA 0955
duration: 15min 28sec (928sec)


RUN TABLE
# Name AMU AMU Offset Time s Delay s Coll Focus Centering Ref Cent Detector CUP Mode setting
1 Zr2O 195.82038 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97838 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02338 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98359 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98859 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99159 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06841 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04556 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05168 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18838   19378   19744   19719   20712   20869  
Pb204 1   1   1   1   0   0  
Bkgrnd 0   1   0   0   1   0  
Pb206 911   843   883   841   792   867  
Pb207 281   255   232   229   206   205  
Pb208 300   286   276   268   268   265  
U238 982   899   918   975   943   1078  
ThO248 6158 R 6238   6255   6240   6190   6282  
UO254 2518   2575   2592   2627   2737   2792  
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 2.5 0.1 0.2 1.8 0.3 0.1 3.5 0.3 0.3
slope 2.6 -0.0 -0.0 -0.1 -0.1 -0.0 0.1 0.1 0.4
interc 1.9E+4 1.3E+0 3.3E-1 8.9E+2 2.8E+2 3.0E+2 9.0E+2 6.2E+3 2.4E+3
cps 1.0E+4 6.1E-2 3.3E-2 8.6E+1 7.9E+0 2.8E+1 1.9E+2 1.2E+3 1.3E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000327 0.091962 0.325884 52.210631 0.446958 6.495679 6.810066
ratio 0.000401 0.002988 0.010024 1.307353 0.013767 0.163415 0.176179

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00964(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1881 0.0113 1110.9331 61.2  
Pb207/Pb206 0.0920 0.0030 1466.5929 60.5  
Pb207/U235 2.3847 0.1715 1238.0258 50.2  
Pb208/Th232 0.0583 0.0045 1144.7970 85.1  
204 corrected          
Pb206/U238 0.1871 0.0113 1105.5920 61.2  
Pb207/Pb206 0.0874 0.0069 1369.0405 144.6  
Pb207/U235 2.2542 0.2372 1198.1071 71.4  
Pb208/Pb206 0.3159 0.0177      
Pb208/Th232 0.0562 0.0051 1104.9396 96.5  
207 corrected          
Pb206/U238 0.1848 0.0111 1092.9733 60.4  
Pb208/Pb206 0.2918 0.0128      
Pb208/Th232 0.0513 0.0042 1010.5913 81.5  
208 corrected          
Pb206/U238 0.1871 0.0114 1105.6447 61.4  
Pb207/Pb206 0.0874 0.0082 1370.0384 171.4  
Pb207/U235 2.2555 0.2671 1198.5084 80.1  

CONCENTRATIONS
CONCENTRATIONS U:22.2 ppm Th:23.3 ppm Th/U:1.052 ±0.0 Pb204:1.2 ppb sens 17.1