SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-2.1, 2014-08-14, 12:24:33, 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=1518, z=2190
primary beam = -1.8nA
QT1 Y defl = -1770 bits; QT1 Z defl = 385 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 195.81687 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97487 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.01987 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98032 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98532 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.98832 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06447 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04073 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.04643 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18291   19030 R 20204   20513   20890   21554  
Pb204 1   4   1   1   0   1  
Bkgrnd 0   1   0   4   0   1  
Pb206 1286   1275   1271   1236   1286 R 1238  
Pb207 341   343   272   338   296   287  
Pb208 441   476   476   476   491   431  
U238 1196   1201   1300   1281   1343   1308  
ThO248 9812   10258   10039   10027   10343 R 10058  
UO254 3552   3554   3448   3545   3574   3623  
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 3.7 0.8 0.6 0.3 2.8 1.5 0.9 3.6 0.9
slope 4.1 -0.0 0.0 -0.0 -0.1 -0.0 0.2 0.3 0.1
interc 1.8E+4 2.3E+0 5.2E-1 1.3E+3 3.4E+2 4.7E+2 1.2E+3 9.9E+3 3.5E+3
cps 1.0E+4 1.3E-1 1.0E-1 1.3E+2 1.0E+1 4.7E+1 2.5E+2 2.0E+3 1.8E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000183 0.082095 0.367113 40.243706 0.502065 7.994782 7.029149
ratio 0.000343 0.003310 0.009602 0.512110 0.008149 0.110456 0.093882

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.01016(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1983 0.0062 1166.1724 33.3  
Pb207/Pb206 0.0821 0.0033 1247.7800 77.0  
Pb207/U235 2.2446 0.1212 1195.0934 37.2  
Pb208/Th232 0.0577 0.0026 1132.8965 49.6  
204 corrected          
Pb206/U238 0.1977 0.0063 1163.0417 33.7  
Pb207/Pb206 0.0795 0.0063 1184.7630 148.0  
Pb207/U235 2.1674 0.1916 1170.6552 59.6  
Pb208/Pb206 0.3616 0.0157      
Pb208/Th232 0.0566 0.0032 1113.2640 61.8  
207 corrected          
Pb206/U238 0.1975 0.0062 1161.9957 33.4  
Pb208/Pb206 0.3598 0.0128      
Pb208/Th232 0.0563 0.0029 1106.7032 55.2  
208 corrected          
Pb206/U238 0.1995 0.0064 1172.5673 34.1  
Pb207/Pb206 0.0873 0.0071 1367.9944 148.7  
Pb207/U235 2.4023 0.2182 1243.2881 63.1  

CONCENTRATIONS
CONCENTRATIONS U:29.4 ppm Th:37.1 ppm Th/U:1.263 ±0.0 Pb204:0.9 ppb sens 17.3