SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-26.1, 2014-08-15, 06:18:26, 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=1239, z=3574
primary beam = -1.9nA
QT1 Y defl = -1721 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 195.82432 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98232 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02732 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98803 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99303 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99603 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07349 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04958 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05631 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 19697   20128   20730   20967   21909   21861  
Pb204 1   2   2   2   1   2  
Bkgrnd 1   1   1   1   0   0  
Pb206 2528   2473   2478   2390   2479   2291  
Pb207 656   614   557   557   593   558  
Pb208 1001   1011   998   943   940   901  
U238 2288   2302   2438   2482   2427   2459  
ThO248 20262   20239   20310   20947   20576   20871 R
UO254 6974   6910   6718   6802   6814   6700  
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 2.0 0.3 0.1 1.4 1.6 0.3 1.2 2.2 0.8
slope 3.0 0.0 -0.0 -0.2 -0.1 -0.1 0.2 0.9 -0.3
interc 2.0E+4 1.5E+0 1.3E+0 2.5E+3 6.4E+2 1.0E+3 2.3E+3 2.0E+4 7.0E+3
cps 1.1E+4 1.7E-1 6.4E-2 2.4E+2 2.0E+1 9.7E+1 4.8E+2 4.1E+3 3.4E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000427 0.080593 0.398383 22.049588 0.511811 8.585832 7.180396
ratio 0.000266 0.001906 0.006566 0.217328 0.006863 0.085394 0.073771

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 0.1937 0.0048 1141.5022 25.6  
Pb207/Pb206 0.0806 0.0019 1211.5402 45.8  
Pb207/U235 2.1527 0.0778 1165.9117 24.8  
Pb208/Th232 0.0579 0.0019 1136.9515 36.3  
204 corrected          
Pb206/U238 0.1924 0.0048 1134.3467 25.9  
Pb207/Pb206 0.0745 0.0045 1055.7904 118.2  
Pb207/U235 1.9770 0.1358 1107.7134 45.3  
Pb208/Pb206 0.3858 0.0117      
Pb208/Th232 0.0557 0.0023 1094.6303 44.5  
207 corrected          
Pb206/U238 0.1930 0.0048 1137.8540 25.6  
Pb208/Pb206 0.3920 0.0082      
Pb208/Th232 0.0567 0.0020 1115.3793 38.3  
208 corrected          
Pb206/U238 0.1939 0.0048 1142.4405 26.1  
Pb207/Pb206 0.0814 0.0050 1230.7034 115.5  
Pb207/U235 2.1757 0.1498 1173.3059 46.8  

CONCENTRATIONS
CONCENTRATIONS U:54.4 ppm Th:72.6 ppm Th/U:1.334 ±0.0 Pb204:3.9 ppb sens 17.3