SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
506-16.1, 2014-08-14, 18:27:42, 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=7986, y=1422, z=3188
primary beam = -1.8nA
QT1 Y defl = -1708 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 195.82029 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97829 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02329 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98498 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98999 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99299 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07067 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04609 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05252 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 18117   18726   19686   19845   20393   20633  
Pb204 2   3   0   1   1   1  
Bkgrnd 0   0   0   1   1   1  
Pb206 927   909   898   915   863   843  
Pb207 243   255   231   249   252   234  
Pb208 344   312   275   312   313   273  
U238 870   910   927   874   913   887  
ThO248 6743   6521   6434   6538   6388   6470  
UO254 2586   2539   2529   2607   2541   2635  
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 2.9 0.2 0.0 0.3 0.5 1.9 0.7 1.4 0.8
slope 3.3 -0.0 0.0 -0.1 -0.0 -0.1 0.0 -0.3 0.1
interc 1.8E+4 2.1E+0 -2.2E-1 9.4E+2 2.5E+2 3.3E+2 8.9E+2 6.7E+3 2.5E+3
cps 9.9E+3 1.3E-1 5.3E-2 8.9E+1 8.1E+0 3.1E+1 1.8E+2 1.3E+3 1.3E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000823 0.090622 0.344250 55.013025 0.497869 7.298332 7.162426
ratio 0.000546 0.002680 0.011995 0.798041 0.009618 0.109031 0.113467

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00970(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.1894 0.0070 1118.0754 38.0  
Pb207/Pb206 0.0906 0.0027 1438.6779 55.3  
Pb207/U235 2.3664 0.1189 1232.5291 35.3  
Pb208/Th232 0.0574 0.0032 1127.9899 60.6  
204 corrected          
Pb206/U238 0.1869 0.0071 1104.5469 38.6  
Pb207/Pb206 0.0790 0.0089 1172.1269 208.1  
Pb207/U235 2.0358 0.2511 1127.5500 80.7  
Pb208/Pb206 0.3191 0.0233      
Pb208/Th232 0.0525 0.0045 1034.2702 85.8  
207 corrected          
Pb206/U238 0.1863 0.0069 1101.5209 37.6  
Pb208/Pb206 0.3134 0.0140      
Pb208/Th232 0.0514 0.0032 1013.2751 61.3  
208 corrected          
Pb206/U238 0.1891 0.0072 1116.3836 38.7  
Pb207/Pb206 0.0892 0.0077 1408.1208 157.0  
Pb207/U235 2.3251 0.2292 1219.9681 67.7  

CONCENTRATIONS
CONCENTRATIONS U:21.8 ppm Th:24.7 ppm Th/U:1.136 ±0.0 Pb204:2.9 ppb sens 17.1