SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-12.1, 2014-08-14, 16:31:53, 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=7981, y=1493, z=2815
primary beam = -1.8nA
QT1 Y defl = -1707 bits; QT1 Z defl = 385 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 195.82010 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97810 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02310 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98380 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98881 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99181 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06958 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04462 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05170 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18087   18870   19717   19803   20116 R 20196  
Pb204 3   2   2   1   1   1  
Bkgrnd 1   0   0   2   0   1  
Pb206 3447   3507   3403   3450   3367   3168 R
Pb207 883   831   824   844   784   747 R
Pb208 967   991   932   957   979   852  
U238 3426   3498   3506   3408   3551   3531  
ThO248 21152   20637   20440   20900   20018   20251  
UO254 9795   9548   9400   9635   9309   9540  
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 3.1 0.1 0.3 1.9 0.6 2.1 0.8 2.7 2.7
slope 2.0 -0.0 0.0 -0.3 -0.1 -0.1 0.1 -1.2 -0.3
interc 1.9E+4 2.8E+0 5.1E-1 3.5E+3 8.9E+2 1.0E+3 3.4E+3 2.1E+4 9.7E+3
cps 9.8E+3 1.6E-1 6.7E-2 3.4E+2 2.7E+1 9.5E+1 7.0E+2 4.1E+3 4.8E+3
rej1 18087             20900  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000265 0.080680 0.280475 14.140666 0.487263 5.913730 6.874528
ratio 0.000166 0.001396 0.006059 0.121938 0.005827 0.049300 0.067044

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.01031(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.2012 0.0046 1181.7985 24.7  
Pb207/Pb206 0.0807 0.0014 1213.6575 33.7  
Pb207/U235 2.2382 0.0680 1193.1086 21.1  
Pb208/Th232 0.0594 0.0020 1165.8048 38.5  
204 corrected          
Pb206/U238 0.2004 0.0046 1177.2112 24.7  
Pb207/Pb206 0.0769 0.0029 1119.1672 73.8  
Pb207/U235 2.1249 0.0994 1156.9407 31.8  
Pb208/Pb206 0.2722 0.0085      
Pb208/Th232 0.0574 0.0023 1127.5440 44.9  
207 corrected          
Pb206/U238 0.2009 0.0046 1179.9913 24.7  
Pb208/Pb206 0.2772 0.0070      
Pb208/Th232 0.0586 0.0021 1150.7373 40.8  
208 corrected          
Pb206/U238 0.2016 0.0047 1183.9985 25.0  
Pb207/Pb206 0.0825 0.0038 1256.7412 87.0  
Pb207/U235 2.2926 0.1234 1210.0158 37.4  

CONCENTRATIONS
CONCENTRATIONS U:82.5 ppm Th:78.4 ppm Th/U:0.950 ±0.0 Pb204:3.8 ppb sens 16.6