SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
OGC-6.1, 2014-08-15, 03:57:06, 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=7980, y=1860, z=2649
primary beam = -1.9nA
QT1 Y defl = -1706 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 195.82490 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.98290 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02790 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98818 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.99318 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.99618 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.07412 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.05041 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.05631 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 19063   19731   20716   21236   21687   22177  
Pb204 2   3   2   1   0   1  
Bkgrnd 0   0   0   0   0   0  
Pb206 27892   27949   27454   26844   26896   26324  
Pb207 25283   25143 R 24481 R 24157   24225   23775  
Pb208 3734   3744   3755   3694   3662   3575  
U238 7331   7564   7726   7864   7937   8103  
ThO248 25921   25696   25433   25860   26404   26428  
UO254 21281   21387   21377   21460   21649   21917  
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 1.8 0.2 0.0 1.5 1.4 0.4 0.3 3.9 0.4
slope 4.1 -0.0 -0.0 -2.2 -2.0 -0.2 0.9 0.9 0.8
interc 1.9E+4 2.7E+0 -0.0E+0 2.8E+4 2.5E+4 3.8E+3 7.3E+3 2.5E+4 2.1E+4
cps 1.0E+4 1.4E-1 -0.0E+0 2.7E+3 8.2E+2 3.7E+2 1.5E+3 5.2E+3 1.1E+4
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000051 0.300640 0.136014 6.811002 1.770194 3.364834 6.969573
ratio 0.000017 0.001291 0.001001 0.040635 0.009782 0.023024 0.037688

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.03644(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.7112 0.0086 3462.8659 32.5  
Pb207/Pb206 0.3006 0.0013 3473.5230 6.6  
Pb207/U235 29.4796 0.3944 3469.6208 13.1  
Pb208/Th232 0.1808 0.0030 3359.0592 51.5  
204 corrected          
Pb206/U238 0.7106 0.0086 3460.6609 32.4  
Pb207/Pb206 0.3001 0.0013 3470.7153 6.8  
Pb207/U235 29.4019 0.3948 3467.0321 13.1  
Pb208/Pb206 0.1343 0.0012      
Pb208/Th232 0.1784 0.0031 3317.2902 52.9  
207 corrected          
Pb206/U238 0.7085 0.0087 3452.8241 32.8  
Pb208/Pb206 0.1281 0.0045      
Pb208/Th232 0.1697 0.0065 3168.2571 111.2  
208 corrected          
Pb206/U238 0.7127 0.0087 3468.7325 32.6  
Pb207/Pb206 0.3021 0.0015 3480.9476 7.7  
Pb207/U235 29.6862 0.4069 3476.4804 13.4  

CONCENTRATIONS
CONCENTRATIONS U:172.7 ppm Th:92.4 ppm Th/U:0.535 ±0.0 Pb204:5.4 ppb sens 16.9