SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
702-3.1, 2014-08-14, 21:15:39, 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=7985, y=2077, z=2631
primary beam = -1.8nA
QT1 Y defl = -1732 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 195.82451 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98251 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02751 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98798 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99299 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99599 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07446 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05093 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05658 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18309   18699   19585   19777   20166   20616  
Pb204 3   1   2   0   1   1  
Bkgrnd 1   1   1   0   0   -1  
Pb206 2699   2628   2455   2485   2449   2380  
Pb207 615   631   527   592   533   552  
Pb208 1151   1107   996   1067   992   1008  
U238 2656   2686   2752   2719   2748   2867  
ThO248 26725   25458   24790   24177   24323   25478  
UO254 7995   7783   7719   7703   7794   7932  
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 0.3 0.1 1.1 2.4 1.9 0.5 3.6 2.2
slope 3.0 -0.0 -0.0 -0.4 -0.1 -0.2 0.2 -3.1 -0.1
interc 1.8E+4 2.3E+0 1.3E+0 2.7E+3 6.2E+2 1.1E+3 2.6E+3 2.6E+4 7.9E+3
cps 9.8E+3 1.3E-1 4.1E-2 2.5E+2 1.9E+1 1.1E+2 5.4E+2 5.0E+3 3.9E+3
rej1     -1         25478  
rej2               26725  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000335 0.076340 0.422001 18.052694 0.462044 9.141316 7.184394
ratio 0.000176 0.002130 0.008142 0.154535 0.005304 0.084011 0.074259

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00895(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1747 0.0041 1037.8988 22.6  
Pb207/Pb206 0.0763 0.0021 1103.9891 54.8  
Pb207/U235 1.8387 0.0713 1059.4072 25.2  
Pb208/Th232 0.0519 0.0017 1023.3811 33.4  
204 corrected          
Pb206/U238 0.1738 0.0041 1032.7637 22.7  
Pb207/Pb206 0.0716 0.0035 973.8214 95.6  
Pb207/U235 1.7147 0.0969 1014.0407 35.6  
Pb208/Pb206 0.4123 0.0104      
Pb208/Th232 0.0505 0.0019 995.1452 36.2  
207 corrected          
Pb206/U238 0.1742 0.0041 1035.0292 22.7  
Pb208/Pb206 0.4166 0.0098      
Pb208/Th232 0.0511 0.0019 1007.6046 35.6  
208 corrected          
Pb206/U238 0.1753 0.0043 1041.1682 23.3  
Pb207/Pb206 0.0793 0.0058 1180.8756 137.9  
Pb207/U235 1.9178 0.1530 1087.2879 51.9  

CONCENTRATIONS
CONCENTRATIONS U:66.5 ppm Th:94.4 ppm Th/U:1.419 ±0.0 Pb204:3.3 ppb sens 16.8