SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
BRB-2.1, 2014-08-14, 11:20:03, 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=7993, y=1847, z=3673
primary beam = -1.8nA
QT1 Y defl = -1694 bits; QT1 Z defl = 385 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 195.81705 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97505 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02005 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98022 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98522 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.98822 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06576 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04085 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.04730 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 19928   20475   21060   21166   21484   22008  
Pb204 3   0   3   1   1   0  
Bkgrnd 0   1   0   0   0   1  
Pb206 17943   17969   17532   17639   17177   17028  
Pb207 3201   3296   3065   3089   3010   2919  
Pb208 1241   1238   1215   1189   1203   1213  
U238 38272   38848   39948   39753   40336   40769 R
ThO248 55898   55895   55945   55847   56341   56101  
UO254 109389   109758   109996   109597   111544   111034  
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 0.2 0.2 1.1 1.5 0.2 2.2 0.5 2.9
slope 2.5 -0.0 0.0 -1.3 -0.4 -0.1 3.1 0.4 2.4
interc 2.0E+4 2.4E+0 1.7E-1 1.8E+4 3.3E+3 1.2E+3 3.8E+4 5.6E+4 1.1E+5
cps 1.1E+4 1.2E-1 3.4E-2 1.8E+3 1.0E+2 1.2E+2 7.9E+3 1.1E+4 5.5E+4
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000051 0.058995 0.069433 1.339412 0.222429 1.418714 6.970440
ratio 0.000027 0.000559 0.000845 0.005618 0.001000 0.004983 0.025821

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00458(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.0893 0.0008 551.6210 4.6  
Pb207/Pb206 0.0590 0.0006 566.9161 20.5  
Pb207/U235 0.7267 0.0099 554.6131 5.8  
Pb208/Th232 0.0275 0.0004 548.3505 8.5  
204 corrected          
Pb206/U238 0.0893 0.0008 551.1876 4.6  
Pb207/Pb206 0.0583 0.0007 539.3484 26.0  
Pb207/U235 0.7170 0.0112 548.8867 6.6  
Pb208/Pb206 0.0677 0.0013      
Pb208/Th232 0.0268 0.0006 534.1140 11.3  
207 corrected          
Pb206/U238 0.0893 0.0008 551.3727 4.6  
Pb208/Pb206 0.0684 0.0016      
Pb208/Th232 0.0271 0.0007 540.1962 13.7  
208 corrected          
Pb206/U238 0.0894 0.0008 551.7238 4.6  
Pb207/Pb206 0.0592 0.0007 573.3810 25.3  
Pb207/U235 0.7290 0.0112 555.9671 6.6  

CONCENTRATIONS
CONCENTRATIONS U:878.5 ppm Th:198.1 ppm Th/U:0.226 ±0.0 Pb204:3.4 ppb sens 17.6