SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-8.1, 2014-08-14, 14:37:34, 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=7981, y=1343, z=2535
primary beam = -1.8nA
QT1 Y defl = -1740 bits; QT1 Z defl = 385 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 195.81799 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97598 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02098 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98131 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98632 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.98932 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06611 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04340 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.04846 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18385   18460   19831   19934   20398   20504  
Pb204 5   1   1   3   0   1  
Bkgrnd 1   3   0   0   1   0  
Pb206 2687   2658   2634   2527   2422   2465  
Pb207 657   632   627   583   613   573  
Pb208 933   998   958   999   954   905  
U238 2422   2462   2571   2632   2542   2584  
ThO248 20488   19858   20099   19802   20125   20545  
UO254 7106   7090   7071   7000   6934 R 7141  
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 3.7 1.5 0.4 0.7 0.5 1.6 1.3 2.5 1.0
slope 3.2 -0.0 -0.0 -0.4 -0.1 -0.0 0.2 0.9 -0.1
interc 1.8E+4 3.5E+0 1.7E+0 2.7E+3 6.6E+2 9.8E+2 2.4E+3 2.0E+4 7.1E+3
cps 9.8E+3 1.7E-1 7.9E-2 2.6E+2 2.1E+1 9.6E+1 5.0E+2 4.0E+3 3.5E+3
rej1 19831             20488  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000351 0.079807 0.373828 19.465702 0.508756 7.909097 7.002579
ratio 0.000271 0.001466 0.006861 0.212077 0.006273 0.082013 0.073650

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.01038(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.2025 0.0049 1188.5695 26.4  
Pb207/Pb206 0.0798 0.0015 1192.2209 35.8  
Pb207/U235 2.2279 0.0720 1189.8654 22.4  
Pb208/Th232 0.0604 0.0020 1185.5596 39.0  
204 corrected          
Pb206/U238 0.2013 0.0050 1182.4703 26.7  
Pb207/Pb206 0.0748 0.0044 1063.8111 115.2  
Pb207/U235 2.0771 0.1396 1141.2846 45.1  
Pb208/Pb206 0.3634 0.0120      
Pb208/Th232 0.0584 0.0026 1146.9700 48.9  
207 corrected          
Pb206/U238 0.2024 0.0049 1188.0860 26.5  
Pb208/Pb206 0.3730 0.0078      
Pb208/Th232 0.0602 0.0021 1182.5019 40.7  
208 corrected          
Pb206/U238 0.2026 0.0050 1189.1418 26.9  
Pb207/Pb206 0.0803 0.0048 1203.6708 113.9  
Pb207/U235 2.2421 0.1519 1194.3084 46.5  

CONCENTRATIONS
CONCENTRATIONS U:60.6 ppm Th:76.0 ppm Th/U:1.253 ±0.0 Pb204:3.7 ppb sens 16.7