SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
702-4.1, 2014-08-14, 21:36:37, 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=2093, z=2658
primary beam = -1.8nA
QT1 Y defl = -1750 bits; QT1 Z defl = 400 bits
runtable 2014-08-14 GSWA 0955
duration: 15min 28sec (928sec)


RUN TABLE
# Name AMU AMU Offset Time s Delay s Coll Focus Centering Ref Cent Detector CUP Mode setting
1 Zr2O 195.82585 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98385 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02885 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98894 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99394 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99694 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07654 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05261 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05878 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 17866   17877   18724   19100   19339   19530  
Pb204 0   0   3   0   0   1  
Bkgrnd 0   1   0   1   0   0  
Pb206 1012   1062   1057   960   1004   1003  
Pb207 256   228   240   230   268   221  
Pb208 371   359   383   375   350   373  
U238 1161   1099   1256   1185   1273   1284  
ThO248 8729   8797   8786   8985   8849   9057  
UO254 3387   3355   3269   3355   3255   3448  
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 2.4 0.5 0.2 1.5 1.6 0.5 2.3 0.7 2.0
slope 2.4 0.0 -0.0 -0.1 -0.0 -0.0 0.2 0.4 0.0
interc 1.8E+4 5.1E-1 4.9E-1 1.0E+3 2.5E+2 3.7E+2 1.1E+3 8.7E+3 3.3E+3
cps 9.4E+3 6.8E-2 3.3E-2 1.0E+2 8.0E+0 3.7E+1 2.4E+2 1.8E+3 1.7E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000348 0.078673 0.362547 39.385646 0.424579 7.385467 6.984609
ratio 0.000427 0.002876 0.009536 0.720905 0.009975 0.134663 0.141768

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00870(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1698 0.0080 1011.2278 43.7  
Pb207/Pb206 0.0787 0.0029 1163.9126 70.8  
Pb207/U235 1.8423 0.1160 1060.6893 40.6  
Pb208/Th232 0.0525 0.0032 1034.6847 60.7  
204 corrected          
Pb206/U238 0.1689 0.0080 1006.0073 44.0  
Pb207/Pb206 0.0737 0.0072 1033.8392 185.8  
Pb207/U235 1.7167 0.1954 1014.8049 70.5  
Pb208/Pb206 0.3521 0.0182      
Pb208/Th232 0.0507 0.0038 1000.0855 73.3  
207 corrected          
Pb206/U238 0.1687 0.0079 1004.9528 43.6  
Pb208/Pb206 0.3500 0.0121      
Pb208/Th232 0.0504 0.0032 993.0931 62.3  
208 corrected          
Pb206/U238 0.1691 0.0080 1007.0190 44.1  
Pb207/Pb206 0.0747 0.0076 1060.0262 191.6  
Pb207/U235 1.7411 0.2040 1023.8576 72.9  

CONCENTRATIONS
CONCENTRATIONS U:29.9 ppm Th:35.1 ppm Th/U:1.172 ±0.0 Pb204:1.5 ppb sens 15.7