SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-21.1, 2014-08-15, 02:14:30, 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=1493, z=3386
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 195.82444 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98244 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02744 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98837 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99337 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99637 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07473 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05095 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05778 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18983   19418   19896   20448   20962 R 21123  
Pb204 0   1   1   2   0   1  
Bkgrnd 2   0   1   2   1   1  
Pb206 2556   2550   2560   2384   2368   2493  
Pb207 655   619   682   604   589   587  
Pb208 1122   1168   1093 R 1105   1103   1119  
U238 2312   2403   2458   2385   2420   2553  
ThO248 24583   24260 R 24196   23966 R 24361   24479 R
UO254 6769   6866   6971   6719   6780   6842  
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 0.6 0.2 0.2 2.4 1.4 0.7 1.3 2.4 1.4
slope 3.0 0.0 -0.0 -0.2 -0.1 -0.0 0.2 -0.1 -0.0
interc 1.9E+4 6.0E-1 1.2E+0 2.6E+3 6.7E+2 1.1E+3 2.3E+3 2.4E+4 6.8E+3
cps 1.0E+4 8.5E-2 1.2E-1 2.5E+2 2.1E+1 1.1E+2 4.8E+2 4.9E+3 3.4E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- -0.000125 0.083398 0.450369 21.058292 0.516136 10.101704 7.090837
ratio -0.000216 0.001922 0.007944 0.205548 0.008138 0.102885 0.078332

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.01027(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.2003 0.0054 1177.0618 29.1  
Pb207/Pb206 0.0834 0.0019 1278.5420 44.3  
Pb207/U235 2.3035 0.0869 1213.3668 26.4  
Pb208/Th232 0.0569 0.0020 1119.1750 38.8  
204 corrected          
Pb206/U238 0.2007 0.0055 1179.2079 29.4  
Pb207/Pb206 0.0851 0.0038 1318.8845 85.2  
Pb207/U235 2.3565 0.1312 1229.5283 38.9  
Pb208/Pb206 0.4539 0.0112      
Pb208/Th232 0.0575 0.0023 1129.9205 43.6  
207 corrected          
Pb206/U238 0.1994 0.0054 1172.0435 29.1  
Pb208/Pb206 0.4420 0.0094      
Pb208/Th232 0.0556 0.0021 1094.0402 40.1  
208 corrected          
Pb206/U238 0.2031 0.0056 1191.7521 30.2  
Pb207/Pb206 0.0952 0.0061 1532.8987 116.9  
Pb207/U235 2.6667 0.1958 1319.2683 52.8  

CONCENTRATIONS
CONCENTRATIONS U:56.5 ppm Th:89.5 ppm Th/U:1.585 ±0.0 Pb204:-1.2 ppb sens 16.7