SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-4.1, 2014-08-14, 13:02:32, 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=7978, y=1527, z=2360
primary beam = -1.8nA
QT1 Y defl = -1719 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 195.81680 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97480 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.01980 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98048 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98548 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.98848 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06547 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04101 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.04786 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18970   19428   20771   20608   21414   21196  
Pb204 1   1   0   3   2   0  
Bkgrnd 0   2   1   0   0   0  
Pb206 2588   2518   2534   2475   2621   2438  
Pb207 612   598   576   587   589   583  
Pb208 542   532   560   576   588   531  
U238 2309   2380   2328   2444   2598   2411  
ThO248 11637   11458   11662   12054   12059   11746  
UO254 6850   7151   6931   6971   7140   7030 R
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 4.4 0.4 0.2 1.9 0.2 1.2 3.1 3.9 2.1
slope 3.3 0.0 -0.0 -0.1 -0.0 0.0 0.2 0.5 0.2
interc 1.9E+4 1.1E+0 1.1E+0 2.6E+3 6.1E+2 5.4E+2 2.3E+3 1.1E+4 6.9E+3
cps 1.0E+4 1.2E-1 4.7E-2 2.5E+2 2.0E+1 5.5E+1 4.8E+2 2.3E+3 3.5E+3
rej1 20771                
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000276 0.077795 0.218757 21.311932 0.527747 4.895493 7.301058
ratio 0.000219 0.001574 0.004788 0.336555 0.009733 0.080242 0.118391

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00990(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1932 0.0072 1138.7150 38.8  
Pb207/Pb206 0.0778 0.0016 1141.6457 39.7  
Pb207/U235 2.0724 0.0924 1139.7241 30.1  
Pb208/Th232 0.0563 0.0028 1107.0730 52.7  
204 corrected          
Pb206/U238 0.1924 0.0072 1134.0972 38.9  
Pb207/Pb206 0.0739 0.0037 1037.8715 98.7  
Pb207/U235 1.9591 0.1303 1101.5690 43.8  
Pb208/Pb206 0.2098 0.0092      
Pb208/Th232 0.0538 0.0033 1058.4805 64.0  
207 corrected          
Pb206/U238 0.1931 0.0072 1138.3673 38.9  
Pb208/Pb206 0.2181 0.0062      
Pb208/Th232 0.0561 0.0029 1103.4162 56.2  
208 corrected          
Pb206/U238 0.1938 0.0073 1142.0646 39.1  
Pb207/Pb206 0.0806 0.0037 1212.2829 88.8  
Pb207/U235 2.1546 0.1362 1166.5461 42.9  

CONCENTRATIONS
CONCENTRATIONS U:56.9 ppm Th:42.7 ppm Th/U:0.751 ±0.0 Pb204:2.6 ppb sens 18.3