SHRIMP II v2 SW v2.13 ACQUISITION DATA PRINTOUT
analyst GSWA, mount G14-21-1,
BRA-1.1, 2014-08-14, 10:20:23, 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=7979, y=1786, z=2237
primary beam = -1.8nA
QT1 Y defl = -1718 bits; QT1 Z defl = 350 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 195.81828 0.00000 2.0 8.0 12 YES 3.0 REF ALW COUNTER R 1.0E-12
2 Pb204 203.97628 0.00000 10.0 3.0 11 NO 10.0 NONE ALW COUNTER  
3 Bkgrnd 204.02128 0.00000 10.0 5.0 11 NO 0.5 BAC ALW COUNTER  
4 Pb206 205.98182 0.00000 10.0 4.0 11 YES 6.0 REF ALW COUNTER R 1.0E-12
5 Pb207 206.98682 0.00000 30.0 2.0 11 NO 5.0 NONE ALW COUNTER FS+10mV=1Mcps=FIXED As
6 Pb208 207.98982 0.00000 10.0 2.0 11 NO 4.0 NONE ALW COUNTER  
7 U238 238.06780 0.00000 5.0 3.0 10 YES 3.0 REF ALW COUNTER  
8 ThO248 248.04414 0.00000 5.0 3.0 9 YES 3.0 NONE ALW COUNTER  
9 UO254 254.04964 0.00000 2.0 3.0 9 YES 2.0 REF ALW COUNTER  
AMU-B calibration field offset -0.076 G.

DATA
Zr2O 20366   20823   21382   21871   21927   22432  
Pb204 2   1   2   2   3   2  
Bkgrnd 1   0   3   1   1   1  
Pb206 19259   18911   18988   18407   18333   18261  
Pb207 3458   3417   3472   3329   3367   3307  
Pb208 1288   1326   1276   1268   1246   1260  
U238 40074   41284   41115   41930   42344   43086 R
ThO248 58821   57791   58319   58223   58512   58924  
UO254 115669   115376   115454   115231   115632   115785 R
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 1.0 0.2 0.3 1.2 0.5 0.3 2.1 3.3 0.4
slope 2.6 0.0 0.0 -1.4 -0.2 -0.1 3.5 0.5 0.2
interc 2.0E+4 1.5E+0 1.1E+0 1.9E+4 3.5E+3 1.3E+3 4.0E+4 5.8E+4 1.2E+5
cps 1.1E+4 2.0E-1 1.2E-1 1.9E+3 1.1E+2 1.3E+2 8.3E+3 1.2E+4 5.8E+4
rej1                  
rej2                  

RATIOS
  204/206 207/206 208/206 196/238 206/238 248/238 254/238
error +- 0.000047 0.060499 0.068448 1.303424 0.225745 1.410203 6.973674
ratio 0.000041 0.000469 0.000815 0.005232 0.000985 0.005930 0.021720

CALIBRATION
CALIBRATION Zr20/U=1.3034 Pb/U=0.2257 UO/U=6.9737 (Pb/U=0.00464(UO/U)^2)

REDUCED DATA
  rad cor +- age Ma +-  
uncorrected          
Pb206/U238 0.0906 0.0007 559.0000 4.1  
Pb207/Pb206 0.0605 0.0005 621.4524 16.6  
Pb207/U235 0.7556 0.0087 571.4823 5.0  
Pb208/Th232 0.0277 0.0004 551.5851 8.2  
204 corrected          
Pb206/U238 0.0905 0.0007 558.6014 4.1  
Pb207/Pb206 0.0598 0.0008 597.3300 28.0  
Pb207/U235 0.7467 0.0119 566.2977 6.9  
Pb208/Pb206 0.0668 0.0017      
Pb208/Th232 0.0270 0.0007 538.3949 14.1  
207 corrected          
Pb206/U238 0.0904 0.0007 557.9752 4.1  
Pb208/Pb206 0.0643 0.0014      
Pb208/Th232 0.0259 0.0006 517.6545 12.2  
208 corrected          
Pb206/U238 0.0906 0.0007 559.2314 4.1  
Pb207/Pb206 0.0609 0.0006 635.2730 21.6  
Pb207/U235 0.7608 0.0102 574.4799 5.9  

CONCENTRATIONS
CONCENTRATIONS U:903.0 ppm Th:202.4 ppm Th/U:0.224 ±0.0 Pb204:3.3 ppb sens 17.5