SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-25.1, 2014-08-15, 05:58:20, 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=7991, y=1499, z=3471
primary beam = -1.9nA
QT1 Y defl = -1733 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 195.82587 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98387 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02887 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98947 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99447 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99747 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07474 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05212 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05828 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 19283   19302   20338   20617   20802   21392  
Pb204 1   0   3   4   0   0  
Bkgrnd 0   0   0   2   1   0  
Pb206 1466 R 1354   1385   1380   1318   1277  
Pb207 376   331   314   316   340   297  
Pb208 593   602   516   556   546   528  
U238 1296   1360   1355   1356   1382   1414  
ThO248 12294   11895   11498   11292   11246   11199  
UO254 3994 R 3858   3866   3703   3641   3809  
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 2.8 0.8 0.3 0.9 1.4 1.4 0.3 2.7 2.4
slope 2.8 -0.0 0.0 -0.2 -0.1 -0.1 0.1 -1.4 -0.3
interc 1.9E+4 1.6E+0 9.7E-2 1.5E+3 3.6E+2 6.0E+2 1.3E+3 1.2E+4 4.0E+3
cps 1.0E+4 1.3E-1 5.2E-2 1.4E+2 1.1E+1 5.6E+1 2.7E+2 2.3E+3 1.9E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000578 0.080484 0.411056 37.752291 0.504110 8.639368 7.100958
ratio 0.000384 0.002296 0.009631 0.455698 0.007891 0.109616 0.107056

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.01000(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1951 0.0066 1148.9401 35.7  
Pb207/Pb206 0.0805 0.0023 1208.8695 55.2  
Pb207/U235 2.1650 0.1018 1169.8893 32.1  
Pb208/Th232 0.0592 0.0027 1163.2440 51.6  
204 corrected          
Pb206/U238 0.1933 0.0067 1139.1930 36.0  
Pb207/Pb206 0.0723 0.0064 993.0200 169.8  
Pb207/U235 1.9256 0.1901 1090.0086 63.9  
Pb208/Pb206 0.3941 0.0171      
Pb208/Th232 0.0563 0.0033 1106.4459 63.2  
207 corrected          
Pb206/U238 0.1945 0.0066 1145.6246 35.7  
Pb208/Pb206 0.4053 0.0113      
Pb208/Th232 0.0582 0.0028 1143.9325 53.6  
208 corrected          
Pb206/U238 0.1945 0.0067 1145.9372 36.3  
Pb207/Pb206 0.0780 0.0070 1145.9166 169.3  
Pb207/U235 2.0912 0.2101 1145.9301 66.8  

CONCENTRATIONS
CONCENTRATIONS U:31.6 ppm Th:42.7 ppm Th/U:1.354 ±0.0 Pb204:3.1 ppb sens 16.5