SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
BRB-10.1, 2014-08-15, 03:37:06, 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=7998, y=1828, z=3747
primary beam = -1.9nA
QT1 Y defl = -1739 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 195.82462 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98262 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02762 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98836 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99336 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99636 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07464 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05121 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05779 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18768   18860 R 19501   19706   20277   20637  
Pb204 2   1   1   0   0   2  
Bkgrnd 0   0   0   0   0   1  
Pb206 19543   19135   18835   18412   18178   18077  
Pb207 3380   3417   3339   3219   3248   3288  
Pb208 1374   1273   1279   1254   1298   1281  
U238 37164   37818   38220   39266   39581   39444  
ThO248 56636   56016   55560   56206   55817   55654  
UO254 111882   110755   110769   110426   110646   109981  
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 0.9 0.3 0.1 0.7 1.0 1.2 2.8 2.0 1.1
slope 2.6 -0.0 0.0 -2.0 -0.2 -0.1 3.3 -0.9 -1.9
interc 1.9E+4 1.3E+0 -2.4E-1 2.0E+4 3.4E+3 1.3E+3 3.7E+4 5.6E+4 1.1E+5
cps 9.9E+3 9.7E-2 1.8E-2 1.9E+3 1.1E+2 1.3E+2 7.7E+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 +- 0.000042 0.059170 0.069337 1.286458 0.243729 1.460984 7.227245
ratio 0.000022 0.000455 0.000893 0.005844 0.001118 0.006231 0.026916

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00467(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.0911 0.0008 561.8009 4.7  
Pb207/Pb206 0.0592 0.0005 573.3712 16.6  
Pb207/U235 0.7429 0.0092 564.0977 5.3  
Pb208/Th232 0.0280 0.0005 557.3880 9.1  
204 corrected          
Pb206/U238 0.0910 0.0008 561.4379 4.7  
Pb207/Pb206 0.0586 0.0006 550.8132 21.1  
Pb207/U235 0.7348 0.0102 559.3400 6.0  
Pb208/Pb206 0.0679 0.0012      
Pb208/Th232 0.0274 0.0006 545.4627 11.0  
207 corrected          
Pb206/U238 0.0910 0.0008 561.6082 4.7  
Pb208/Pb206 0.0686 0.0014      
Pb208/Th232 0.0276 0.0006 551.0573 12.7  
208 corrected          
Pb206/U238 0.0911 0.0008 561.9396 4.7  
Pb207/Pb206 0.0594 0.0006 581.9008 22.9  
Pb207/U235 0.7460 0.0109 565.9101 6.3  

CONCENTRATIONS
CONCENTRATIONS U:936.7 ppm Th:211.5 ppm Th/U:0.226 ±0.0 Pb204:3.1 ppb sens 16.7