SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-19.1, 2014-08-14, 23:12:09, 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=7986, y=1474, z=3314
primary beam = -1.9nA
QT1 Y defl = -1703 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 195.82587 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98386 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02886 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.99031 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99531 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99831 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07674 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05309 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05907 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18496   19290   20176   20457   20706   21188  
Pb204 0   1   1   0   0   1  
Bkgrnd 3   1   1   1   1   1  
Pb206 2032 R 2020   1964   1939   1943   1936  
Pb207 498   511   481   455   484   497  
Pb208 1028   953 R 984   937   978   1031  
U238 1887   1990   2000   1980   2057   2050  
ThO248 21639   21629   21622   21563   21923   22261  
UO254 5535   5661   5506   5744   5648   5531  
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 3.5 0.2 0.3 0.2 0.9 1.9 0.6 1.7 2.0
slope 3.3 0.0 -0.0 -0.1 -0.0 0.0 0.2 0.7 0.0
interc 1.9E+4 4.2E-1 2.1E+0 2.0E+3 5.0E+2 9.8E+2 1.9E+3 2.1E+4 5.6E+3
cps 1.0E+4 5.1E-2 1.3E-1 2.0E+2 1.6E+1 9.8E+1 4.0E+2 4.3E+3 2.8E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- -0.000401 0.081890 0.498886 25.497094 0.497480 10.959573 7.067081
ratio -0.000266 0.001697 0.009968 0.270627 0.006456 0.107685 0.084187

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00996(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1944 0.0053 1145.0796 28.4  
Pb207/Pb206 0.0819 0.0017 1242.8905 40.1  
Pb207/U235 2.1948 0.0793 1179.3894 24.9  
Pb208/Th232 0.0563 0.0021 1106.2706 39.9  
204 corrected          
Pb206/U238 0.1956 0.0054 1151.7992 28.9  
Pb207/Pb206 0.0875 0.0044 1371.3720 94.4  
Pb207/U235 2.3600 0.1429 1230.5781 42.3  
Pb208/Pb206 0.5099 0.0138      
Pb208/Th232 0.0579 0.0024 1137.0631 45.9  
207 corrected          
Pb206/U238 0.1936 0.0053 1140.6892 28.4  
Pb208/Pb206 0.4916 0.0109      
Pb208/Th232 0.0552 0.0021 1086.1434 40.5  
208 corrected          
Pb206/U238 0.1964 0.0055 1156.1046 29.7  
Pb207/Pb206 0.0910 0.0074 1447.6136 146.7  
Pb207/U235 2.4659 0.2193 1262.0962 62.3  

CONCENTRATIONS
CONCENTRATIONS U:46.6 ppm Th:80.3 ppm Th/U:1.724 ±0.0 Pb204:-3.1 ppb sens 16.7