SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
BRA-11.1, 2014-08-15, 05:38:03, 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=7980, y=1744, z=2308
primary beam = -1.9nA
QT1 Y defl = -1751 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 195.82331 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98131 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02631 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98791 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99291 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99591 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07282 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04954 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05606 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18889   19087   19966   20595   20557   20969  
Pb204 3   3   1   3   0   0  
Bkgrnd 0   0   0   1   1   1  
Pb206 19374   19115   19028   18920   18555   18302  
Pb207 3554   3421   3465   3460   3264   3363 R
Pb208 1350   1285   1319   1280   1265   1226  
U238 37208   38290   39249 R 39231   40305   40102  
ThO248 56405   56001   56404   55383   56465   56129  
UO254 111849   111522   112838   111184   112167   112101  
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 3.3 0.5 0.0 0.4 1.5 0.4 2.9 3.7 3.6
slope 2.9 -0.0 0.0 -1.3 -0.3 -0.1 4.6 -0.2 0.3
interc 1.9E+4 3.4E+0 -2.2E-1 1.9E+4 3.5E+3 1.4E+3 3.7E+4 5.6E+4 1.1E+5
cps 1.0E+4 1.5E-1 5.3E-2 1.9E+3 1.1E+2 1.3E+2 7.8E+3 1.1E+4 5.6E+4
rej1             40102    
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000052 0.060477 0.068491 1.294177 0.242685 1.442981 7.190868
ratio 0.000027 0.000545 0.000806 0.008191 0.001119 0.006981 0.030313

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00469(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.0916 0.0009 564.9299 5.2  
Pb207/Pb206 0.0605 0.0005 620.6917 19.3  
Pb207/U235 0.7637 0.0107 576.1578 6.1  
Pb208/Th232 0.0280 0.0005 558.4895 9.1  
204 corrected          
Pb206/U238 0.0915 0.0009 564.4771 5.2  
Pb207/Pb206 0.0597 0.0007 593.5197 24.7  
Pb207/U235 0.7536 0.0120 570.2874 6.9  
Pb208/Pb206 0.0667 0.0013      
Pb208/Th232 0.0273 0.0006 543.4805 11.8  
207 corrected          
Pb206/U238 0.0914 0.0009 564.0024 5.2  
Pb208/Pb206 0.0648 0.0016      
Pb208/Th232 0.0265 0.0007 527.7344 14.0  
208 corrected          
Pb206/U238 0.0916 0.0009 565.1306 5.2  
Pb207/Pb206 0.0608 0.0007 632.5702 24.0  
Pb207/U235 0.7682 0.0120 578.7482 6.9  

CONCENTRATIONS
CONCENTRATIONS U:928.0 ppm Th:207.8 ppm Th/U:0.224 ±0.0 Pb204:3.8 ppb sens 16.8