SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-14.1, 2014-08-14, 17:37:11, 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=1422, z=2938
primary beam = -1.8nA
QT1 Y defl = -1710 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 195.81979 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97779 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02279 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98403 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98904 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99204 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06945 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04599 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05130 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18018   18813   19323   20037   20653 R 20290  
Pb204 3   1   0   2   4   0  
Bkgrnd 2   2   0   0   1   0  
Pb206 946   997   1038   987   923   908  
Pb207 283   252   259   241   253   235  
Pb208 333   312   305   324   289   304  
U238 954   977   1118   1072   1031   1094  
ThO248 6802   6740   6816   6957   6954   7188 R
UO254 2852   2907   2932   2944   2950 R 2939  
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 0.3 0.7 0.2 2.3 0.5 0.5 2.8 0.9 0.2
slope 4.2 -0.0 -0.0 -0.1 -0.0 -0.0 0.2 0.5 0.1
interc 1.8E+4 2.0E+0 1.9E+0 1.0E+3 2.8E+2 3.3E+2 9.6E+2 6.6E+3 2.9E+3
cps 9.9E+3 1.6E-1 7.9E-2 9.7E+1 8.5E+0 3.1E+1 2.1E+2 1.4E+3 1.5E+3
rej1 20290                
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000885 0.087202 0.323151 48.239258 0.468597 6.664658 7.060415
ratio 0.000685 0.002843 0.009907 1.027167 0.013621 0.144331 0.158187

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00940(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1834 0.0098 1085.7631 53.2  
Pb207/Pb206 0.0872 0.0028 1364.9580 61.5  
Pb207/U235 2.2056 0.1455 1182.8254 45.1  
Pb208/Th232 0.0565 0.0039 1111.0971 74.5  
204 corrected          
Pb206/U238 0.1808 0.0099 1071.6053 53.6  
Pb207/Pb206 0.0746 0.0110 1058.9868 271.8  
Pb207/U235 1.8613 0.3048 1067.4560 102.8  
Pb208/Pb206 0.2958 0.0270      
Pb208/Th232 0.0510 0.0056 1005.3041 108.2  
207 corrected          
Pb206/U238 0.1809 0.0097 1072.1285 52.6  
Pb208/Pb206 0.2968 0.0124      
Pb208/Th232 0.0512 0.0038 1009.2191 73.4  
208 corrected          
Pb206/U238 0.1827 0.0099 1081.8087 53.5  
Pb207/Pb206 0.0837 0.0076 1286.2413 167.4  
Pb207/U235 2.1094 0.2348 1151.8739 73.9  

CONCENTRATIONS
CONCENTRATIONS U:24.6 ppm Th:25.8 ppm Th/U:1.049 ±0.0 Pb204:3.4 ppb sens 17.3