SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-28.1, 2014-08-15, 06:59:52, 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=1304, z=3504
primary beam = -1.9nA
QT1 Y defl = -1727 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 195.82369 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98169 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02669 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98766 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99266 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99566 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07369 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04962 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05651 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 19568   20180   20784   21387   21182   21909  
Pb204 5   1   0   2   1   1  
Bkgrnd 2   3   0   0   0   0  
Pb206 1857   1754   1857   1674   1738   1698  
Pb207 471   432   457 R 425   414   406  
Pb208 1049   995   952   953   897   914  
U238 1633   1692   1739   1697   1825   1762  
ThO248 20743   20784   20783   20705   20416   20535  
UO254 4853   4973   5016   5025   4777   4903  
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 3.2 0.9 0.2 2.2 0.4 0.5 1.1 0.5 2.4
slope 2.8 -0.0 -0.0 -0.2 -0.1 -0.2 0.2 -0.4 -0.1
interc 2.0E+4 3.1E+0 2.4E+0 1.8E+3 4.7E+2 1.1E+3 1.6E+3 2.1E+4 5.0E+3
cps 1.0E+4 1.5E-1 7.6E-2 1.8E+2 1.5E+1 9.7E+1 3.4E+2 4.1E+3 2.5E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000444 0.082039 0.549144 30.613952 0.514797 12.086432 7.198532
ratio 0.000344 0.001999 0.010725 0.347737 0.009081 0.127832 0.097764

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00993(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1939 0.0063 1142.3103 33.8  
Pb207/Pb206 0.0820 0.0020 1246.4442 47.0  
Pb207/U235 2.1930 0.0941 1178.8118 29.5  
Pb208/Th232 0.0568 0.0024 1116.9045 45.1  
204 corrected          
Pb206/U238 0.1925 0.0063 1134.8618 34.1  
Pb207/Pb206 0.0757 0.0057 1088.1486 143.8  
Pb207/U235 2.0101 0.1724 1118.9400 56.5  
Pb208/Pb206 0.5371 0.0167      
Pb208/Th232 0.0552 0.0027 1085.5223 51.1  
207 corrected          
Pb206/U238 0.1929 0.0063 1136.9707 33.8  
Pb208/Pb206 0.5405 0.0120      
Pb208/Th232 0.0556 0.0024 1094.4089 45.7  
208 corrected          
Pb206/U238 0.1954 0.0065 1150.3755 35.2  
Pb207/Pb206 0.0888 0.0086 1399.1860 174.7  
Pb207/U235 2.3912 0.2538 1239.9627 73.3  

CONCENTRATIONS
CONCENTRATIONS U:39.3 ppm Th:73.6 ppm Th/U:1.874 ±0.0 Pb204:2.9 ppb sens 17.1