SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
OGC-3.1, 2014-08-14, 19:08:26, 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=1825, z=2739
primary beam = -1.7nA
QT1 Y defl = -1729 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 195.82295 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98095 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02595 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98622 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99122 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99422 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07350 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04923 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05577 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18258   18658   19203   19614   19286   19796  
Pb204 3   6   3   1   2   0  
Bkgrnd 0   0   0   0   0   0  
Pb206 17013   16910   16381   16016   15673   15271  
Pb207 15359   15126   14400   14047   13882   13751  
Pb208 2539   2577   2455   2384   2401   2355  
U238 4636   4796   4741   4772   4738   4719 R
ThO248 18117   17975   17520   17185   17209   17204  
UO254 13361   13060   12886   12575   12751   12828  
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 3.4 0.8 0.0 0.5 2.7 0.7 0.7 1.9 3.0
slope 1.9 -0.0 -0.0 -2.4 -2.3 -0.3 0.1 -1.3 -0.7
interc 1.8E+4 4.7E+0 -0.0E+0 1.7E+4 1.6E+4 2.6E+3 4.7E+3 1.8E+4 1.3E+4
cps 9.6E+3 2.3E-1 -0.0E+0 1.6E+3 4.8E+2 2.5E+2 9.5E+2 3.5E+3 6.5E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000142 0.297738 0.152037 10.158850 1.714047 3.729168 6.857439
ratio 0.000037 0.001930 0.001345 0.082055 0.011561 0.027158 0.058916

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.03645(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.7113 0.0131 3463.4218 49.3  
Pb207/Pb206 0.2977 0.0019 3458.4961 10.0  
Pb207/U235 29.2011 0.5932 3460.3018 19.8  
Pb208/Th232 0.1801 0.0042 3346.8444 71.9  
204 corrected          
Pb206/U238 0.7097 0.0131 3457.3216 49.2  
Pb207/Pb206 0.2962 0.0020 3450.5875 10.5  
Pb207/U235 28.9864 0.5933 3453.0593 19.9  
Pb208/Pb206 0.1473 0.0019      
Pb208/Th232 0.1741 0.0044 3243.7030 75.2  
207 corrected          
Pb206/U238 0.7111 0.0133 3462.5123 49.9  
Pb208/Pb206 0.1513 0.0066      
Pb208/Th232 0.1792 0.0088 3331.4938 149.8  
208 corrected          
Pb206/U238 0.7133 0.0132 3470.8748 49.4  
Pb207/Pb206 0.2996 0.0022 3468.0597 11.4  
Pb207/U235 29.4636 0.6114 3469.0901 20.2  

CONCENTRATIONS
CONCENTRATIONS U:114.6 ppm Th:68.8 ppm Th/U:0.601 ±0.0 Pb204:9.9 ppb sens 16.7