SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
OGC-7.1, 2014-08-15, 07:40:37, 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=1804, z=2640
primary beam = -2.0nA
QT1 Y defl = -1754 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 195.82400 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98200 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02700 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98794 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99294 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99594 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07344 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04967 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05639 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 19468   20070   20694   21101   21730   22228  
Pb204 3   3   4   0   3   1  
Bkgrnd 1   1   1   2   1   0  
Pb206 25811   25160   24805   24530   23988   23714  
Pb207 23143   22328   22255   21867   21578   21104  
Pb208 7424   7218   6947   7053   6951   6810  
U238 6581   6931   6900   7064   7212   7149  
ThO248 49855   49966   49984   49580   50123   50496  
UO254 19267   19145   19711   19453   19893   19583  
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 0.2 0.3 0.2 0.5 1.2 1.5 1.7 1.5 2.6
slope 3.6 -0.0 -0.0 -2.7 -2.4 -0.7 0.7 0.6 0.7
interc 1.9E+4 3.4E+0 1.3E+0 2.6E+4 2.3E+4 7.4E+3 6.6E+3 5.0E+4 1.9E+4
cps 1.1E+4 2.2E-1 9.9E-2 2.5E+3 7.4E+2 7.1E+2 1.4E+3 1.0E+4 9.7E+3
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000051 0.298614 0.287761 7.597473 1.781252 7.212494 7.020457
ratio 0.000028 0.001201 0.001863 0.052486 0.012147 0.048322 0.055380

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.03614(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.7053 0.0121 3440.6248 45.7  
Pb207/Pb206 0.2986 0.0012 3463.0484 6.2  
Pb207/U235 29.0382 0.5266 3454.8119 17.6  
Pb208/Th232 0.1780 0.0038 3310.8276 64.3  
204 corrected          
Pb206/U238 0.7047 0.0121 3438.4552 45.7  
Pb207/Pb206 0.2981 0.0013 3460.2429 6.7  
Pb207/U235 28.9622 0.5283 3452.2363 17.7  
Pb208/Pb206 0.2862 0.0021      
Pb208/Th232 0.1769 0.0038 3291.5762 64.9  
207 corrected          
Pb206/U238 0.7003 0.0121 3421.8475 45.7  
Pb208/Pb206 0.2740 0.0045      
Pb208/Th232 0.1683 0.0044 3143.8163 75.4  
208 corrected          
Pb206/U238 0.7098 0.0123 3457.5658 46.1  
Pb207/Pb206 0.3028 0.0022 3484.6407 11.4  
Pb207/U235 29.6333 0.5817 3474.7306 19.1  

CONCENTRATIONS
CONCENTRATIONS U:155.6 ppm Th:177.4 ppm Th/U:1.140 ±0.0 Pb204:4.8 ppb sens 16.6