SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
702-7.2, 2014-08-15, 01:33:51, 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=7985, y=2294, z=2615
primary beam = -1.9nA
QT1 Y defl = -1736 bits; QT1 Z defl = 400 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 195.82377 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98177 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02677 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98778 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99279 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99579 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07396 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04969 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05752 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 19089   19752   20729   21033   21450   22059  
Pb204 1   3   1   1   0   0  
Bkgrnd 1   0   2   1   1   1  
Pb206 1825   1836   1791   1752   1731   1768  
Pb207 422   442   389   373   427   418  
Pb208 578   554   562   534   605   589  
U238 1939   1957   2146   2185   2144   2141  
ThO248 14173   13736   14002   14105   14118   14142  
UO254 5667   5657   5682   5819 R 5792   5778  
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 1.9 0.4 0.1 0.4 2.0 1.3 2.5 2.1 0.4
slope 3.8 -0.0 0.0 -0.1 -0.0 0.0 0.3 0.2 0.2
interc 1.9E+4 2.1E+0 8.4E-1 1.8E+3 4.2E+2 5.5E+2 1.9E+3 1.4E+4 5.6E+3
cps 1.0E+4 9.1E-2 1.0E-1 1.8E+2 1.4E+1 5.7E+1 4.1E+2 2.8E+3 2.9E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- -0.000056 0.076493 0.318362 25.248866 0.431703 6.793033 6.916655
ratio -Inf 0.002318 0.006840 0.369679 0.007385 0.101577 0.104474

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00902(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1761 0.0061 1045.6292 33.4  
Pb207/Pb206 0.0765 0.0023 1108.0024 59.4  
Pb207/U235 1.8573 0.0907 1066.0249 31.7  
Pb208/Th232 0.0516 0.0024 1016.8652 45.6  
204 corrected          
Pb206/U238 0.1763 Inf 1046.4956 Inf  
Pb207/Pb206 0.0773 Inf 1128.6035 NaN  
Pb207/U235 1.8783 Inf 1073.4470 Inf  
Pb208/Pb206 0.3201 Inf      
Pb208/Th232 0.0519 Inf 1023.0954 Inf  
207 corrected          
Pb206/U238 0.1756 0.0061 1043.1186 33.4  
Pb208/Pb206 0.3134 0.0090      
Pb208/Th232 0.0507 0.0025 998.8042 48.6  
208 corrected          
Pb206/U238 0.1770 0.0062 1050.3196 33.9  
Pb207/Pb206 0.0808 0.0055 1215.9940 127.5  
Pb207/U235 1.9708 0.1576 1105.5859 52.5  

CONCENTRATIONS
CONCENTRATIONS U:46.4 ppm Th:50.4 ppm Th/U:1.087 ±0.0 Pb204:-0.4 ppb sens 16.7