SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-23.1, 2014-08-15, 02:55:37, 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=7991, y=1420, z=3477
primary beam = -1.9nA
QT1 Y defl = -1748 bits; QT1 Z defl = 400 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 195.82498 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98298 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02798 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98859 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99359 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99659 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07455 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05109 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05710 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18120   18195   18988   19240   19932   19944  
Pb204 5   0   0   1   4   1  
Bkgrnd 2   0   0   2   1   1  
Pb206 1643   1635   1608   1546   1550   1570  
Pb207 400   395   369 R 366   371   354  
Pb208 773   769   719   716   710   703  
U238 1518   1653   1637 R 1726   1674   1731  
ThO248 16147   16217   16155   16199   16286   16204  
UO254 4508   4468   4604 R 4555   4361 R 4513  
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 2.3 0.9 0.2 0.4 0.2 0.3 1.4 0.1 1.8
slope 2.7 -0.0 -0.0 -0.1 -0.1 -0.1 0.2 0.1 -0.1
interc 1.8E+4 2.4E+0 1.0E+0 1.6E+3 4.0E+2 7.8E+2 1.5E+3 1.6E+4 4.5E+3
cps 9.6E+3 1.8E-1 1.0E-1 1.6E+2 1.3E+1 7.4E+1 3.3E+2 3.2E+3 2.3E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000494 0.078399 0.462154 29.238829 0.484773 9.866064 6.865159
ratio 0.000408 0.001842 0.008441 0.370334 0.007596 0.121209 0.099127

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.01029(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.2007 0.0066 1179.2136 35.3  
Pb207/Pb206 0.0784 0.0018 1157.0052 45.9  
Pb207/U235 2.1698 0.0927 1171.4060 29.3  
Pb208/Th232 0.0584 0.0025 1147.9515 46.9  
204 corrected          
Pb206/U238 0.1991 0.0067 1170.6851 35.8  
Pb207/Pb206 0.0714 0.0066 967.6506 177.6  
Pb207/U235 1.9592 0.1997 1101.6246 66.3  
Pb208/Pb206 0.4481 0.0172      
Pb208/Th232 0.0562 0.0031 1105.3480 58.4  
207 corrected          
Pb206/U238 0.2008 0.0066 1179.8765 35.4  
Pb208/Pb206 0.4632 0.0097      
Pb208/Th232 0.0586 0.0025 1151.2612 48.5  
208 corrected          
Pb206/U238 0.2022 0.0068 1187.1720 36.3  
Pb207/Pb206 0.0849 0.0070 1312.7783 152.5  
Pb207/U235 2.3665 0.2202 1232.5375 64.3  

CONCENTRATIONS
CONCENTRATIONS U:39.8 ppm Th:63.2 ppm Th/U:1.587 ±0.0 Pb204:3.4 ppb sens 15.0