SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-20.1, 2014-08-14, 23:32:44, 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=1392, z=3374
primary beam = -1.9nA
QT1 Y defl = -1700 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 195.82577 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98377 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02877 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98991 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99491 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99791 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07455 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05200 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05899 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 19480   19528   20412   20945   21118   21438  
Pb204 3   0   2   3   2   2  
Bkgrnd 1   1   1   1   0   0  
Pb206 2542   2555   2522   2363   2424   2399  
Pb207 640 R 579   592   633   614 R 626  
Pb208 1134   1068   1070   1082   1011   1089  
U238 2361   2455   2405   2407   2443   2449  
ThO248 23226   23206 R 23068   23499   23488   24001  
UO254 6848   6864   6959   6886   6931   6915  
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 2.5 0.2 0.1 1.1 1.2 1.4 0.4 1.9 0.2
slope 2.8 0.0 -0.0 -0.2 0.0 -0.1 0.1 1.0 0.1
interc 1.9E+4 1.8E+0 1.3E+0 2.6E+3 6.1E+2 1.1E+3 2.4E+3 2.3E+4 6.9E+3
cps 1.0E+4 2.0E-1 6.4E-2 2.5E+2 2.0E+1 1.1E+2 4.8E+2 4.7E+3 3.4E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000558 0.082641 0.437088 21.344782 0.510899 9.665077 7.135910
ratio 0.000279 0.001632 0.007409 0.201243 0.006141 0.087722 0.068849

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.01003(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1958 0.0045 1152.6902 24.0  
Pb207/Pb206 0.0826 0.0016 1260.7599 38.1  
Pb207/U235 2.2310 0.0712 1190.8338 22.1  
Pb208/Th232 0.0567 0.0018 1115.1809 33.9  
204 corrected          
Pb206/U238 0.1940 0.0045 1143.2627 24.2  
Pb207/Pb206 0.0747 0.0046 1061.0909 119.7  
Pb207/U235 1.9993 0.1374 1115.2626 45.5  
Pb208/Pb206 0.4210 0.0127      
Pb208/Th232 0.0541 0.0022 1065.7488 41.7  
207 corrected          
Pb206/U238 0.1947 0.0044 1146.9763 23.9  
Pb208/Pb206 0.4273 0.0086      
Pb208/Th232 0.0552 0.0018 1085.2264 35.0  
208 corrected          
Pb206/U238 0.1975 0.0046 1161.6715 24.8  
Pb207/Pb206 0.0901 0.0054 1426.8902 110.6  
Pb207/U235 2.4521 0.1646 1258.0396 47.3  

CONCENTRATIONS
CONCENTRATIONS U:56.0 ppm Th:84.5 ppm Th/U:1.509 ±0.0 Pb204:5.2 ppb sens 17.3