SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-9.1, 2014-08-14, 15:34:54, 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=7978, y=1362, z=2657
primary beam = -1.8nA
QT1 Y defl = -1704 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 195.81805 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97605 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02105 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98155 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98656 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.98956 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06642 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04257 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.04905 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18890   18772   19707   20095   20302   20267  
Pb204 1   1   3   2   0   0  
Bkgrnd 2   1   0   2   1   0  
Pb206 1853   1850   1769   1754   1659   1669 R
Pb207 467   434   439   399   406   411  
Pb208 778   751   691   738   690   693  
U238 1701   1776   1790   1778   1757   1908  
ThO248 15503   15390   15294   15351   15429   15279  
UO254 5165   4910   4818   5039   4902   5002  
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 4.4 0.6 0.2 0.4 0.6 0.9 1.4 0.4 3.5
slope 2.2 -0.0 -0.0 -0.3 -0.1 -0.1 0.2 -0.2 -0.1
interc 1.9E+4 1.9E+0 1.6E+0 1.9E+3 4.6E+2 7.8E+2 1.7E+3 1.5E+4 5.0E+3
cps 9.9E+3 1.1E-1 9.7E-2 1.8E+2 1.4E+1 7.3E+1 3.5E+2 3.1E+3 2.5E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000077 0.080551 0.413696 27.884762 0.496065 8.680047 7.026912
ratio 0.000279 0.001781 0.007472 0.357470 0.007390 0.101921 0.109879

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.01005(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1961 0.0068 1154.0828 36.5  
Pb207/Pb206 0.0806 0.0018 1210.5197 42.9  
Pb207/U235 2.1774 0.0944 1173.8624 29.7  
Pb208/Th232 0.0591 0.0026 1161.4307 49.2  
204 corrected          
Pb206/U238 0.1958 0.0068 1152.7725 36.8  
Pb207/Pb206 0.0795 0.0047 1183.5503 112.0  
Pb207/U235 2.1452 0.1545 1163.5083 48.7  
Pb208/Pb206 0.4114 0.0126      
Pb208/Th232 0.0587 0.0030 1153.8906 56.5  
207 corrected          
Pb206/U238 0.1955 0.0068 1151.3086 36.5  
Pb208/Pb206 0.4089 0.0088      
Pb208/Th232 0.0583 0.0026 1145.4649 50.3  
208 corrected          
Pb206/U238 0.1958 0.0069 1152.5171 37.0  
Pb207/Pb206 0.0792 0.0061 1178.2309 145.1  
Pb207/U235 2.1389 0.1893 1161.4782 59.5  

CONCENTRATIONS
CONCENTRATIONS U:42.4 ppm Th:58.2 ppm Th/U:1.371 ±0.0 Pb204:0.6 ppb sens 17.4