SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
OGC-1.1, 2014-08-14, 10:49:09, 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=1794, z=2819
primary beam = -1.8nA
QT1 Y defl = -1688 bits; QT1 Z defl = 272 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 195.81859 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97659 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02159 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98171 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98671 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.98971 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06697 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04305 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.04886 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18798   19264   19784   20203   20481   21147 R
Pb204 1   0   5   1   5   1  
Bkgrnd 2   1   0   1   0   1  
Pb206 22382   22095   21567   21498   20940   21230  
Pb207 20247   19818   19390   19435   18925   18946  
Pb208 5366   5277   5142   5151   4894   4956  
U238 6275   6325   6478   6669   6603   6641  
ThO248 37906   37799   37924   37895   38241   37798  
UO254 17664   17774   17861   17985   18079   17883  
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 0.4 2.2 0.2 2.4 1.4 0.9 0.9 0.8 0.6
slope 2.9 0.0 -0.0 -1.7 -1.7 -0.6 0.5 0.1 0.4
interc 1.9E+4 1.3E+0 1.4E+0 2.2E+4 2.0E+4 5.4E+3 6.2E+3 3.8E+4 1.8E+4
cps 1.0E+4 2.2E-1 8.1E-2 2.2E+3 6.5E+2 5.2E+2 1.3E+3 7.6E+3 8.9E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000066 0.300634 0.238598 7.767274 1.672707 5.866206 6.899750
ratio 0.000048 0.001670 0.001706 0.045300 0.011128 0.032158 0.040809

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.03514(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.6857 0.0093 3366.0944 35.5  
Pb207/Pb206 0.3006 0.0017 3473.4932 8.6  
Pb207/U235 28.4222 0.4347 3433.7695 14.9  
Pb208/Th232 0.1740 0.0030 3242.7057 51.9  
204 corrected          
Pb206/U238 0.6849 0.0093 3363.3159 35.5  
Pb207/Pb206 0.2999 0.0018 3469.8767 9.5  
Pb207/U235 28.3258 0.4417 3430.4397 15.2  
Pb208/Pb206 0.2365 0.0024      
Pb208/Th232 0.1723 0.0032 3213.0398 55.8  
207 corrected          
Pb206/U238 0.6650 0.0092 3286.5050 35.4  
Pb208/Pb206 0.1767 0.0059      
Pb208/Th232 0.1250 0.0046 2380.4663 83.1  
208 corrected          
Pb206/U238 0.6891 0.0094 3379.1345 35.8  
Pb207/Pb206 0.3039 0.0021 3490.2618 10.8  
Pb207/U235 28.8748 0.4651 3449.2719 15.7  

CONCENTRATIONS
CONCENTRATIONS U:150.5 ppm Th:141.5 ppm Th/U:0.940 ±0.0 Pb204:5.9 ppb sens 16.2