SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
BRB-4.1, 2014-08-14, 14:56:44, 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=7993, y=1754, z=3660
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 195.81790 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97590 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02090 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98146 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98647 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.98947 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06639 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04306 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.04925 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18948   18828   19515   20416   20474   21081  
Pb204 2   1   0   2   0   1  
Bkgrnd 0   0   1   0   0   0  
Pb206 17569   17509   17279   16874   16764   16700  
Pb207 3184   3158   3011   3028   3112   3099  
Pb208 1293   1212   1114   1210   1100   1093  
U238 35867   36503   37437   38324   38553   38749  
ThO248 53856   53342   53260   53236   53223   53943  
UO254 105801   105054   105350   105518   108338   105878  
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 3.9 0.3 0.2 0.7 1.6 2.3 2.7 2.6 1.2
slope 3.1 -0.0 -0.0 -1.3 -0.1 -0.2 4.0 0.0 0.4
interc 1.9E+4 1.5E+0 2.5E-1 1.8E+4 3.1E+3 1.3E+3 3.6E+4 5.3E+4 1.1E+5
cps 1.0E+4 9.6E-2 1.6E-2 1.7E+3 1.0E+2 1.2E+2 7.5E+3 1.1E+4 5.3E+4
rej1                 108338
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000047 0.060376 0.069011 1.341279 0.229411 1.433228 7.068960
ratio 0.000025 0.000589 0.001257 0.008942 0.001068 0.006394 0.026329

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00459(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.0896 0.0008 553.1227 4.7  
Pb207/Pb206 0.0604 0.0006 617.0768 20.9  
Pb207/U235 0.7458 0.0104 565.7962 6.0  
Pb208/Th232 0.0274 0.0006 547.0189 11.4  
204 corrected          
Pb206/U238 0.0895 0.0008 552.7278 4.7  
Pb207/Pb206 0.0597 0.0007 592.8591 25.3  
Pb207/U235 0.7370 0.0114 560.6345 6.7  
Pb208/Pb206 0.0674 0.0015      
Pb208/Th232 0.0268 0.0007 534.0298 13.2  
207 corrected          
Pb206/U238 0.0894 0.0008 552.0876 4.7  
Pb208/Pb206 0.0648 0.0019      
Pb208/Th232 0.0257 0.0008 512.9599 16.0  
208 corrected          
Pb206/U238 0.0896 0.0008 553.3144 4.7  
Pb207/Pb206 0.0607 0.0008 628.6861 29.3  
Pb207/U235 0.7501 0.0129 568.2920 7.5  

CONCENTRATIONS
CONCENTRATIONS U:885.4 ppm Th:199.5 ppm Th/U:0.225 ±0.0 Pb204:3.2 ppb sens 17.8