SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-18.1, 2014-08-14, 22:41:17, 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=1443, z=3251
primary beam = -1.9nA
QT1 Y defl = -1702 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 195.82665 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98465 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02965 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.99126 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99626 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99926 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07523 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05394 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05948 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 19677   20337   20834   20842   21256   21735  
Pb204 2   3   1   0   0   0  
Bkgrnd 1   0   2   0   3   0  
Pb206 708   692   726   750   702   733  
Pb207 201   199   188   207   186   181  
Pb208 247   234   228 R 250   226   258  
U238 666   710   721   714   704   718  
ThO248 4680   4779   4847   4980   5007   5221  
UO254 1985   1946   1975   1975   2017   2103  
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 0.2 0.4 0.7 0.4 0.8 0.5 0.4 0.8
slope 2.4 -0.0 0.0 0.0 -0.0 0.0 0.0 0.7 0.1
interc 2.0E+4 2.5E+0 8.4E-1 7.0E+2 2.0E+2 2.4E+2 6.8E+2 4.6E+3 1.9E+3
cps 1.0E+4 8.7E-2 1.0E-1 7.2E+1 6.5E+0 2.4E+1 1.4E+2 9.7E+2 9.9E+2
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- -0.000195 0.088849 0.333164 74.385346 0.510865 6.931215 7.073031
ratio -Inf 0.002956 0.010185 1.174306 0.011077 0.114134 0.126664

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.01021(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1993 0.0083 1171.4416 44.7  
Pb207/Pb206 0.0888 0.0030 1400.9087 62.5  
Pb207/U235 2.4413 0.1383 1254.8488 40.0  
Pb208/Th232 0.0609 0.0035 1195.6850 66.4  
204 corrected          
Pb206/U238 0.1999 Inf 1174.7821 Inf  
Pb207/Pb206 0.0916 Inf 1458.3521 NaN  
Pb207/U235 2.5237 Inf 1278.8851 Inf  
Pb208/Pb206 0.3391 Inf      
Pb208/Th232 0.0622 Inf 1219.8946 Inf  
207 corrected          
Pb206/U238 0.1971 0.0083 1159.6070 44.4  
Pb208/Pb206 0.3120 0.0128      
Pb208/Th232 0.0564 0.0036 1109.7815 68.5  
208 corrected          
Pb206/U238 0.1985 0.0084 1167.5254 45.1  
Pb207/Pb206 0.0856 0.0072 1330.2239 154.6  
Pb207/U235 2.3447 0.2316 1225.9418 68.0  

CONCENTRATIONS
CONCENTRATIONS U:16.0 ppm Th:17.4 ppm Th/U:1.089 ±0.0 Pb204:-0.5 ppb sens 17.2