SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
OGC-5.1, 2014-08-15, 00:13:20, 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=1865, z=2699
primary beam = -1.9nA
QT1 Y defl = -1688 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 195.82534 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98334 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02834 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98944 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99445 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99745 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07526 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05261 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05815 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 19058   19630   20572   20729   21433   21559  
Pb204 4   1   2   2   2   1  
Bkgrnd 3   0   3   0   2   2  
Pb206 32204   31649   31218   30607   30359   29978  
Pb207 29043   27932   28037   27423   27466   27073  
Pb208 7107   7060   6971   6902   6737   6878  
U238 8263   8712   8669   8807   8941   8849 R
ThO248 48185   48563   47994   48419   48773   48457  
UO254 24225   24474   24101 R 24293   24406   24429  
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 2.7 0.7 0.3 0.4 3.4 0.8 2.4 1.5 0.9
slope 3.4 -0.0 -0.0 -2.9 -2.2 -0.4 0.7 0.4 0.2
interc 1.9E+4 2.9E+0 1.8E+0 3.2E+4 2.9E+4 7.1E+3 8.3E+3 4.8E+4 2.4E+4
cps 1.0E+4 1.9E-1 1.7E-1 3.1E+3 9.3E+2 7.0E+2 1.7E+3 9.7E+3 1.2E+4
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000008 0.299708 0.224471 5.961489 1.790284 5.584307 7.015893
ratio 0.000020 0.001524 0.001217 0.049035 0.012809 0.039922 0.050917

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.03637(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.7098 0.0115 3457.6094 43.2  
Pb207/Pb206 0.2997 0.0015 3468.7134 7.9  
Pb207/U235 29.3305 0.5150 3464.6438 17.1  
Pb208/Th232 0.1804 0.0036 3351.7435 61.3  
204 corrected          
Pb206/U238 0.7097 0.0115 3457.2488 43.2  
Pb207/Pb206 0.2996 0.0016 3468.2520 8.0  
Pb207/U235 29.3178 0.5162 3464.2190 17.1  
Pb208/Pb206 0.2242 0.0014      
Pb208/Th232 0.1801 0.0036 3347.6107 62.0  
207 corrected          
Pb206/U238 0.7074 0.0116 3448.7049 43.5  
Pb208/Pb206 0.2178 0.0053      
Pb208/Th232 0.1744 0.0054 3249.5274 92.9  
208 corrected          
Pb206/U238 0.7125 0.0116 3467.9422 43.4  
Pb207/Pb206 0.3023 0.0020 3481.8251 10.4  
Pb207/U235 29.6942 0.5443 3476.7479 17.8  

CONCENTRATIONS
CONCENTRATIONS U:198.2 ppm Th:175.1 ppm Th/U:0.883 ±0.0 Pb204:1.0 ppb sens 16.8