SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-1.1, 2014-08-14, 12:05:34, 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=1513, z=2120
primary beam = -1.8nA
QT1 Y defl = -1770 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 195.81633 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97433 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.01933 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.97945 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98446 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.98746 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06423 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04068 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.04640 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 19196   19856   20356   20338   20467   21034  
Pb204 3   5   1   1   0   1  
Bkgrnd 1   1   0   0   1   1  
Pb206 2044   2000   2019   1911   1832   1820 R
Pb207 528   523   468   439   468   449  
Pb208 770   802   745   703   626 R 697  
U238 1858   1954   1974   1922   2047   1965  
ThO248 15809   14982   15144   14971   15267   15200  
UO254 5607   5191   5199   5461   5334   5433  
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 2.6 0.9 0.1 0.6 1.2 2.5 1.4 0.8 1.6
slope 2.0 -0.0 -0.0 -0.3 -0.1 -0.2 0.1 0.4 0.4
interc 1.9E+4 3.8E+0 6.7E-1 2.1E+3 5.3E+2 8.1E+2 1.9E+3 1.5E+4 5.1E+3
cps 1.0E+4 1.7E-1 6.7E-2 1.9E+2 1.6E+1 7.3E+1 3.9E+2 3.0E+3 2.6E+3
rej1               15809 5607
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000516 0.082559 0.377531 26.112138 0.498441 7.745519 6.760356
ratio 0.000285 0.001826 0.009785 0.310867 0.007167 0.088843 0.088121

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.01091(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.2128 0.0063 1243.8943 33.6  
Pb207/Pb206 0.0826 0.0018 1258.8146 42.6  
Pb207/U235 2.4227 0.0951 1249.3682 27.8  
Pb208/Th232 0.0637 0.0027 1248.1724 52.1  
204 corrected          
Pb206/U238 0.2111 0.0064 1234.5497 33.8  
Pb207/Pb206 0.0752 0.0048 1074.9508 122.7  
Pb207/U235 2.1898 0.1614 1177.7889 50.1  
Pb208/Pb206 0.3621 0.0143      
Pb208/Th232 0.0606 0.0032 1189.1093 60.8  
207 corrected          
Pb206/U238 0.2126 0.0063 1242.5875 33.6  
Pb208/Pb206 0.3754 0.0109      
Pb208/Th232 0.0633 0.0029 1239.9181 54.1  
208 corrected          
Pb206/U238 0.2127 0.0065 1243.0794 34.3  
Pb207/Pb206 0.0819 0.0064 1243.7347 145.8  
Pb207/U235 2.4024 0.2097 1243.3192 60.7  

CONCENTRATIONS
CONCENTRATIONS U:44.2 ppm Th:55.7 ppm Th/U:1.261 ±0.0 Pb204:4.2 ppb sens 16.3