SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
702-16.1, 2014-08-15, 09:28:31, 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=7985, y=2248, z=3092
primary beam = -2.0nA
QT1 Y defl = -1703 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 195.82198 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97997 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02497 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98594 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99095 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99395 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07102 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04791 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05430 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 20106   20799   22064   22070   22332   22934  
Pb204 1   1   3   2   1   1  
Bkgrnd 0   0   1   0   0   1  
Pb206 1400   1334   1293   1270   1276   1243  
Pb207 337   349   327   283   291   315  
Pb208 448   429   429   426   415   390  
U238 1407   1508   1518   1517   1630   1520  
ThO248 11046   10972   11205   11130   11053   10925  
UO254 4071   4334   4235   4309   4296   4313  
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 1.0 0.5 0.2 0.4 1.5 0.2 2.0 1.1 1.7
slope 3.6 -0.0 0.0 -0.2 -0.1 -0.1 0.2 -0.1 0.2
interc 2.0E+4 1.6E+0 1.2E-2 1.4E+3 3.5E+2 4.5E+2 1.4E+3 1.1E+4 4.1E+3
cps 1.1E+4 1.5E-1 3.5E-2 1.3E+2 1.1E+1 4.3E+1 3.0E+2 2.2E+3 2.1E+3
rej1 22064                
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000879 0.081241 0.326615 36.140493 0.432781 7.348837 7.042234
ratio 0.000417 0.002469 0.007470 0.550328 0.008122 0.114076 0.120082

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00873(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1703 0.0066 1013.7571 36.4  
Pb207/Pb206 0.0812 0.0025 1227.2725 58.5  
Pb207/U235 1.9076 0.0998 1083.7452 34.3  
Pb208/Th232 0.0480 0.0024 947.4327 46.9  
204 corrected          
Pb206/U238 0.1679 0.0066 1000.5472 36.5  
Pb207/Pb206 0.0687 0.0069 889.0392 195.6  
Pb207/U235 1.5899 0.1794 966.2557 68.0  
Pb208/Pb206 0.2995 0.0170      
Pb208/Th232 0.0434 0.0032 858.3971 61.2  
207 corrected          
Pb206/U238 0.1686 0.0066 1004.5506 36.2  
Pb208/Pb206 0.3078 0.0098      
Pb208/Th232 0.0448 0.0025 885.4025 48.0  
208 corrected          
Pb206/U238 0.1724 0.0068 1025.4536 37.2  
Pb207/Pb206 0.0921 0.0061 1469.3376 121.6  
Pb207/U235 2.1894 0.1785 1177.6880 55.3  

CONCENTRATIONS
CONCENTRATIONS U:32.8 ppm Th:38.0 ppm Th/U:1.159 ±0.0 Pb204:4.2 ppb sens 17.0